First, youll see an example that introduces a straight approach relying on list comprehensions to collect and separate options from arguments. If this variable is set to an integer, it is used to configure the This allows us to take this code from computer to computer as long as the directory structure exists, the program will run without fail. Command line processing may have a direct relationship with stdin to respect the conventions detailed in the previous section. added to the start of sys.path and the __main__.py file in The complexity of the command line ranges from the ability to pass a single argument, to numerous arguments and options, much like a Domain Specific Language. tracemalloc module. Augment the filename usage: python3 [option] [-c cmd | -m mod | file | -] [arg] Options and arguments (and corresponding environment variables): -b : issue warnings about str(bytes_instance), str(bytearray_instance), and comparing bytes/bytearray with str. This is equivalent to Now that you know how to get the current working directory in Python, lets see how we can use it change (or set) the working directory. If this is set, Python wont add the user site-packages directory to sys.path. Each tutorial at Real Python is created by a team of developers so that it meets our high quality standards. Revisit parse from seq_parse.py to use getopt: getopt.getopt() takes the following arguments: Note that a short option followed by a colon (:) expects an option argument, and that a long option trailed with an equals sign (=) expects an option argument. imported and off means they are ignored. When called with -m module-name, the given module is located on the When invoking Python, you may specify any of these options: The most common use case is, of course, a simple invocation of a script: The interpreter interface resembles that of the UNIX shell, but provides some These control sequences send an end of file (EOF) to the terminal, which stops reading from stdin and returns the data that was entered. For example, PYTHONTRACEMALLOC=1 stores only the most recent -v option. Changed in version 3.7: The text layer of the stdout and stderr streams now is unbuffered. Youd replace the data class with a class deriving from NamedTuple, and check_type() would change as follows: A NamedTuple exposes functions like _asdict that transform the object into a dictionary that can be used for data lookup. Further restrictions may be imposed to prevent However, it helps to bridge the gap between an arcane command-line interface and a full-fledged graphical user interface. First of all we need to import python's os module i.e. __main__.py file. checked or unchecked, are validated against their corresponding source The dictionary includes the names of each group as keys and their respective values. os Miscellaneous operating system interfaces Python 3.7.4 documentation This article describes the following contents. See also the PYTHONSAFEPATH environment variable, and -E options). To use prompt_toolkit, you need to install it with pip: You may find the next example a bit contrived, but the intent is to spur ideas and move you slightly away from more rigorous aspects of the command line with respect to the conventions youve seen in this tutorial. This only works on debug builds. Windows has no wildcard expansion, so the program may have to accommodate for that. The following points are examples taken from those references: These standards define notations that are helpful when you describe a command. Although that way may not be obvious at first unless you're Dutch. The first step is to locate the directory in which your target Python executable lives. frame. The second word of the last name, Rossum, is a string thats handled as the age, which is expected to be an int. When called with a directory name argument, it reads and executes an Python programs are text files that have the .py file extension. If set to 1, enable the Python UTF-8 Mode. warnings emitted by a process (even those that are otherwise ignored by If a file path is given, the new directory will be placed at the end. Because the library is built into Python, you can easily import is directly, such as shown below: The module abstracts a number of helpful operating system operations. This allows you to easily write paths to that are relative to the working directory. Mandatory arguments to long options are mandatory for short options too. For example, the ls, pwd, and echo commands can be run as follows: In [1]: ! details. Directories are a great way of organizing our files in a Computer. If set to a comma You can feed data to the program by typing characters on the keyboard. with $ chmod +x script and put an appropriate Shebang line at the top of the script. An option, sometimes called a flag or a switch, is intended to modify the behavior of the program. For example, the warnings.filterwarnings() The following is a proof of concept that attempts to validate the type of the arguments passed at the command line. Step 3: Now open the Windows search bar and search for "idle". Although never is often better than *right* now. character. The command can take more than one file as arguments: Thanks to the wildcards expansion feature of the Unix terminal, its also possible to provide Python command-line arguments with wildcard characters. The call to the handler in main() is triggered by calling a function stored in a dictionary. sys.stdout (sys.stderr continues to use backslashreplace Changing the Current Working Directory in Python To change the current working directory in Python, use the chdir () method. runtime: If setting one of these locale categories succeeds, then the LC_CTYPE This could be any of the following: The new seq implementation barely scratches the surface. If this environment variable is set to a non-empty string, issue a The message of the exception is list index out of range. element, subscript zero (sys.argv[0]), is a string reflecting the programs The format is the same as In this section, youll see some concrete aspects of Python command-line arguments and techniques to handle them. According to the Python Documentation, the purpose of this function is to: Return a list containing the names of the entries in the directory given by path. -c, --check read SHA1 sums from the FILEs and check them, --tag create a BSD-style checksum, -t, --text read in text mode (default). A command-line interface is enabled by the shell interpreter that exposes a command prompt. You can see that the system has two running instances of the Notepad process. Next, youll learn how to handle files passed as arguments. The option -t expects a type as an option-argument, and -N expects the number of input bytes. Any command that works at the command-line can be used in IPython by prefixing it with the ! We will discuss all the Python functions that allow us to interact with the directories in one way or another. The search path can be manipulated from option is given twice (-bb). An Implementation of seq With Regular ExpressionsShow/Hide. If this is set to a non-empty string it is equivalent to specifying the Now, take a step back. This is particularly helpful when developing scripts that are intended to work across different operating systems. These have been refined since the advent of the computer terminal in the mid-1960s. addition to being seen by both the interpreter itself and other locale-aware You can see the full example of the program using prompt_toolkit by expanding the code block below: Complete Source Code for seq_prompt.pyShow/Hide. command. Python Server Side Programming Programming To know the current working directory or pwd use the os module. When changing a directory, the os.chdir() function expects a directory as its input. Changed in version 3.6: This variable can now also be used on Python compiled in release mode. whether or not those processes are running a Python interpreter), as well as Youll learn: The sys module exposes an array named argv that includes the following: The following example demonstrates the content of sys.argv: Note: The f-string syntax used in argv.py leverages the new debugging specifier in Python 3.8. specified warning category. If set to a non-empty string, Python will print statistics of the New in version 3.10: The -X warn_default_encoding option. path to sys.path: see the -P option for details. Leading whitespace is significant in Python statements! site-packages directory. Changed in version 3.4: namespace packages are also supported. If set to an integer, it is equivalent to specifying writer. They're not executable files; rather, the Python interpreter reads these files and carries out the . You can use either an absolute or relative path argument. appropriately named script from that directory. See also PYTHONDONTWRITEBYTECODE. Disable the import of the module site and the site-dependent specifying the -B option. They considered the order of the arguments so that options would not be placed after operands. If this is set to a non-empty string it is equivalent to specifying the However, it becomes quickly error-prone when complexity increases due to the following: The custom approach isnt reusable and requires reinventing the wheel in each program. Basically, this function returns a list with the names of all files and directories that are currently found within a particular directory that you specify when you call the function. See also normal module code. For readability, theres a space between the program name, taskslist, and the option /FI, but its just as correct to type taskslist/FI. The Python Command Prompt Use "cd" to change your directory to the folder with the current version of Python you want to use (i.e. for stdin/stdout/stderr, in the syntax encodingname:errorhandler. Changed in version 3.5: Affects comparisons of bytes with int. So far, the Python command-line arguments were only strings or integers. Search sys.path for the named module and execute its contents as In reality, the Windows command prompt sees the unique double quote as a switch to disable the behavior of the whitespaces as separators and passes anything following the double quote as a unique argument. For example, if the arg_line value is --help, then the dictionary is {'HELP': 'help'}. In this article, we will learn about the basic meaning of a directory and a Current Working Directory. -u option. This is useful when smaller code Turn on hash randomization. Your implementation may need to expand wildcards internally. directory. Lets see how the function works by using Python to change a working directory using an absolute path: The example above is a bit verbose: really, you just need to call os.chdir(absolute_path). By the end of this tutorial, youll have improved on this hand-crafted solution and learned a few better methods. Also, tab-completion and history editing is pymalloc: use the pymalloc allocator for Removing the MAX_PATH Limitation The arguments represent the source or the destination of the data that the command acts on. name, cumulative time (including nested imports) and self time (excluding If this environment variable is set to a non-empty string, start tracing *)| with (--(?Phelp).*)|(--(?Pversion).*)|. When a Observe that the name of the executable ./main is the sole argument. The output will only display the value of the variables, not their names. Despite the different approaches you took to process Python command-line arguments, any complex program might be better off leveraging existing libraries to handle the heavy lifting required by sophisticated command-line interfaces. When a script is passed as first argument or the -c option is used, As Guido Van Rossum wrote in An Introduction to Python for Unix/C Programmers in 1993, C had a strong influence on Python. We can use the Python os .getcwd() function to get the current working directory. Creating a directory in Ubuntu using Python is a very simple task. The Python Launcher for Windows will be installed into the Windows directory Optional features may be selected during installation The standard library can be pre-compiled to bytecode If selected, the install directory will be added to the system PATH Shortcuts are available for all users 4.1.2. to seed the hashes of str and bytes objects. This means no subcommands are necessary. memory blocks when the program finishes or after each statement in the checks that are too expensive to be enabled by default. the variable is the maximum number of frames stored in a traceback of a Only works on sys._enablelegacywindowsfsencoding(). When set to always, all hash-based .pyc files, whether A similar notation can be used to display the usage of a particular command when you invoke it with the option -h or --help. You can launch VS Code with a specific profile via the --profile command-line interface option. Deprecated since version 3.9, removed in version 3.10: The -X oldparser option. One such a character is the asterisk or star (*): The shell converts main. Revisit main() in sha1sum_stdin.py to handle non-existing files passed at the command line: To see the complete example with this extra validation, expand the code block below: Complete Source Code of sha1sum_val.pyShow/Hide. Syntax: os.chdir (path) Parameters: On the python docs page it says: To easily use Python scripts on Unix, you need to make them executable, e.g. additional methods of invocation: When called with standard input connected to a tty device, it prompts for raises an exception. exec_prefix/lib/pythonversion, where prefix and For example, some programs may launch web documentation from the command line or start an interactive shell interpreter like Python. the value 0 will disable hash randomization. an empty string ("") and the current directory will be added to the Before you try getting help from specific libraries, another approach is to create a custom parser. This causes the program to exit with a status of 1, which displays when you print the special variable $? sys.path contains neither the current directory nor the users Watch it together with the written tutorial to deepen your understanding: Command Line Interfaces in Python. Next time you use your application, youll appreciate the documentation you supplied with the --help option or the fact that you can pass options and arguments instead of modifying the source code to supply different data. Also, note that enumerate(), when applied to an iterable, returns an enumerate object that can emit pairs associating the index of an element in sys.arg to its corresponding value. between repeated invocations of Python. denial-of-service caused by carefully chosen inputs that exploit the worst You can provide a default as an environment variable. Below is an example of how to execute tasklist in a command prompt on Windows: Note that the separator for an option is a forward slash (/) instead of a hyphen (-) like the conventions for Unix systems. all consecutive arguments will end up in sys.argv note that the first path (absolute or relative) referring to either a Python file, a directory "-" and the current directory will be added to the start of Python command-line arguments are a subset of the command-line interface. only works on Windows and macOS. value instead of the value got through the C runtime. that location is executed as the __main__ module. As you may have observed, you get a lot for free! You can use a regular expression to enforce a certain order, specific options and option-arguments, or even the type of arguments. LC_CTYPE category in the order listed before loading the interpreter Although they remain These are the main UNIX standards and references: The standards above define guidelines and nomenclatures for anything related to programs and Python command-line arguments. We can pass in either an absolute path or a relative path. It now has no effect if set to an empty string. -X no_debug_ranges disables the inclusion of the tables mapping extra of directories and zipfiles that are passed to the interpreter as the What we did here is use one script with no changes and provided it different arguments.The --input argument contained the path/filename of the input image and likewise with --output. Related Tutorial Categories: If you attempt to traverse the file system to a directory that doesnt exist, then a FileNotFoundError (or an IOError) is raised. Type cd followed by a space, drag and drop the folder into the window, and then press Enter. for compiled (bytecode) files by adding .opt-2 before the You can see that cut ignores the error message because it only receives the data sent to stdout. When set to default, checked and unchecked In Python, you can get and change (set) the current working directory with os.getcwd () and os.chdir (). Note: Checkout hashlib for more details about the hash functions available in the Python standard library. Notably, they add the long option thats a fully named option prefixed with two hyphens (--). If you dont pass any parameter to the original sha1sum utility, then it expects to read data from the standard input. against their corresponding source files. This behaviour is deliberately similar to the handling Leave a comment below and let us know. package name is supplied instead sys.path (allowing modules in that directory to be imported as top tracing with a traceback limit of NFRAME frames. Note that surrounding the multi-word string "Real Python" with quotes ensures that the interpreter handles it as a unique argument, instead of two arguments. Being able to traverse these directories without using paths fixed to a given computer allows you to build more flexible code that can move across computers. Given the pattern args_pattern above, you can extract the Python command-line arguments with the following function: The pattern is already handling the order of the arguments, mutual exclusivity between options and arguments, and the type of the arguments. New in version 3.8: The -X pycache_prefix option. If this is set to a non-empty string, Python wont try to write .pyc If youre using Windows 10, then the most convenient method is to run sha1sum and seq in a Linux environment installed on the WSL. The module field matches the (fully qualified) module name; this match is By default, the full path to the module file (while the module file is being located, the On Mac OS and Linux, sha1sum and seq should come pre-installed, though the features and the help information may sometimes differ slightly between systems or distributions. The following sections offer a glance at Click and Python Prompt Toolkit. Youll delve into argument separators in a later section. If this variable is not set or set to random, a random value is used Python memory allocations using the tracemalloc module. You can expand the code block below to see an implementation of seq with regular expressions. An additional if block would also be needed in main(). This method changes the CWD to a specified path. If set to a non-empty string, the default filesystem encoding and New in version 3.7: The -X importtime, -X dev and -X utf8 options. The shell command mkdir is used to make a new directory in the filesystem according to its argument. Equivalent functionality directly available to Python code. Setting any other non-empty string causes an error during interpreter Then, if you choose the action Sequence, another dialog box is displayed. -I option can be used to run the script in isolated mode where This must be a class name; the match test * to main.c and main.py, which are the two files matching the pattern main. By knowing the working directory, we can files in the directory by using relative paths. See also Python Development Mode, introducing additional runtime overridden using PYTHONIOENCODING as usual. LC_ALL locale override environment variable is also not set, and the This is the Python interpreter that we've been running in Wing and ArcGIS all along. For example, reverse.py expects one argument, and if you omit it, then you get an error: The Python exception IndexError is raised, and the corresponding traceback shows that the error is caused by the expression arg = sys.argv[1]. All modules imported during the execution of the process have direct access to sys.argv. Shell Commands in IPython . semantics. To find the Python executable, you'll need to look for a file called python.exe. statements separated by newlines, with significant leading whitespace as in .pyc extension (see PEP 488). No spam ever. With the spread of Unix tools making their appearance in the Windows ecosystem, non-Windows-specific conventions are also accepted on Windows. Warnings can also be controlled using the PYTHONWARNINGS This is the Python interpreter that we've been running in Wing and ArcGIS all along. The action field is as explained above but only applies to warnings that Empty fields match all values; trailing empty fields may be omitted. Then you will: This will serve as a preparation for options involving modules in the standard libraries or from external libraries that youll learn about later in this tutorial. sys.argv contains the same information as in the C program: With this short introduction into a few arcane aspects of the C language, youre now armed with some valuable knowledge to further grasp Python command-line arguments. -d option. They can be composed of different types of arguments: Before you go deeper into the different types of arguments, youll get an overview of the accepted standards that have been guiding the design of the command-line interface and arguments. See also PYTHONINSPECT. You should feel prepared to apply the following skills to your code: Whether youre running a small script or a complex text-based application, when you expose a command-line interface youll significantly improve the user experience of your Python software. by the default implementation of sys.breakpointhook() which itself is This ensures that in the active console code page, rather than using utf-8. if this is an installed Python (the normal case). After collecting all the necessary data, options, or arguments, the dialog box disappears, and the result is printed at the command line, as in the previous examples: As the command line evolves and you can see some attempts to interact with users more creatively, other packages like PyInquirer also allow you to capitalize on a very interactive approach. If this is set to a non-empty string it is equivalent to specifying the -f, --format=FORMAT use printf style floating-point FORMAT, -s, --separator=STRING use STRING to separate numbers (default: \n), -w, --equal-width equalize width by padding with leading zeroes, --version output version information and exit, Name of the script : sys.argv[0]='argv.py', Arguments of the script : sys.argv[1:]=['un', 'deux', 'trois', 'quatre'], ['argv_pop.py', 'un', 'deux', 'trois', 'quatre'], 0 crw-r--r-- 1 root root 10, 235 Jul 14 08:10 autofs, 0 drwxr-xr-x 2 root root 260 Jul 14 08:10 block, 0 drwxr-xr-x 2 root root 60 Jul 14 08:10 bsg, 0 crw------- 1 root root 10, 234 Jul 14 08:10 btrfs-control, 0 drwxr-xr-x 3 root root 60 Jul 14 08:10 bus, 0 drwxr-xr-x 2 root root 4380 Jul 14 15:08 char, 0 crw------- 1 root root 5, 1 Jul 14 08:10 console, 0000000 7f 45 4c 46 02 01 01 00 00 00 00 00 00 00 00 00 >.ELF<, Image Name PID Session Name Session# Mem Usage, ========================= ======== ================ =========== ============, notepad.exe 13104 Console 6 13,548 K, notepad.exe 6584 Console 6 13,696 K, andre 2117 4 0 13:33 tty1 00:00:00 vi .gitignore, andre 2163 2134 0 13:34 tty3 00:00:00 vi main.c. To enforce a certain order, specific options and option-arguments, or even the type of arguments an... & # x27 ; s os module i.e -- profile command-line interface option, dialog!, so the program finishes or after each statement in the mid-1960s version 3.9, removed version... Are a great way of organizing our files in the syntax encodingname: errorhandler Mode, additional! Dont pass any parameter to the working directory, we will discuss all the Python functions that allow us interact! Denial-Of-Service caused by carefully chosen inputs that exploit the worst you can use either an or. Option thats a fully named option prefixed with two hyphens ( -- ) have improved on this hand-crafted solution learned. Only the most recent -v option an Python programs are text files that have the.py file.... Only display the value got through the C runtime directories are a great way of organizing our in! This environment variable, and -E options ) improved on this hand-crafted solution and learned a few better.! Input bytes is given twice ( -bb ) make a new directory in the search... Or pwd use the os module file extension programs are text files that have the.py extension! The search path can be run as follows: in [ 1 ]: interact with the of. Deprecated since version 3.9, removed in version 3.10: the shell converts main a directory in the...., is intended to work across different operating systems not be placed after operands each! The variable is the asterisk or star ( * ): the text layer of the value of executable... Is set, Python will print statistics of the stdout and stderr streams now is unbuffered [... ( -bb ) operating systems not be placed after operands you dont pass any parameter the. Validated against their corresponding source the dictionary is { 'HELP ': 'HELP ': 'HELP ' } 3.10... Os.getcwd ( ) function expects a directory in which your target Python executable, you get lot! You can expand the code block below to see an example that introduces a straight approach relying on list to! See that the name of the value got through the C runtime feed data to the handler in main ). -- profile command-line interface is enabled by the end of this tutorial, youll how! How to handle files passed as arguments are also accepted on Windows its argument the (! Interfaces Python 3.7.4 documentation this article describes the following contents feed data to the handling a... Executable files ; rather, the Python os.getcwd ( ) terminal in the Python executable, you a! Of a only works on sys._enablelegacywindowsfsencoding ( ) is triggered by calling a function stored in dictionary... Normal case ) step is to locate the directory by using relative paths search path can manipulated... Special variable $ you dont pass any parameter to the working directory launch VS code with a of! Hashlib for more details about the hash functions available in the directory using! To exit with a specific profile via the -- profile command-line interface enabled. Comment below and let us know previous section, is intended to the. The number of input bytes are a great way of organizing our files in a later section are supported. Hyphens ( -- ) streams now is unbuffered got through the C runtime warn_default_encoding option comprehensions to python working directory command line! We will discuss all the Python UTF-8 Mode next, youll learn how to handle files passed as.. Executable lives version 3.6: this variable is not set or set to an empty string as its.. Describes the following points are examples taken from those references: these standards define notations that are when... The type of arguments define notations that are relative to the program of Unix tools making their appearance in Windows. Different operating systems is enabled by default a traceback of a only works sys._enablelegacywindowsfsencoding. The import of the new in version 3.8: the -X oldparser option expand... This allows you to easily write paths to that are intended to modify the behavior of the so! Not set or set to an empty string the executable./main is the asterisk or star ( *:! Encodingname: errorhandler prefixed with two hyphens ( -- ) the names of each group as keys and respective. Far, the Python interpreter reads these files and carries out the directory and a current directory. Run as follows: in [ 1 ]: the window, and echo commands be. The stdout and stderr streams now is unbuffered chmod +x script and put an appropriate Shebang line at command-line. Python & # x27 ; s os module standard input to exit with a specific profile via the -- command-line... Deprecated since version 3.9, removed in version 3.5: Affects comparisons of bytes with int by... List comprehensions to collect and separate options from python working directory command line examples taken from those:. A function stored in a dictionary profile command-line interface option it is equivalent to writer. -N expects the python working directory command line of input bytes a directory, we will discuss all Python. After each statement in the Python standard library disable the import of the,... Installed Python ( the normal case ) variable, and echo commands can be run as follows: in 1! Disable the import of the program to exit with a directory, the ls,,. Named option prefixed with two hyphens ( -- ) the most recent -v option syntax encodingname:.. Particularly helpful when you print the special variable $ for & quot ; this causes the program have... Python os.getcwd ( ) function to get the current working directory for free command prompt on... All the Python standard library feed data to the program intended to modify behavior. Quality standards Shebang line at the command-line can be run as follows: in [ 1 ]!. Modify the behavior of the variables, not their names interact with the directories in way. Or integers long option thats a fully named option prefixed with two hyphens ( --.! The tracemalloc module unchecked, are validated against their corresponding source the dictionary {... Notations that are intended to modify the behavior of the program may have to accommodate that. Notations that are relative to the original sha1sum utility, then the dictionary includes the names of each group keys... A function stored in a later section the variable is set, wont... Introducing additional runtime overridden using PYTHONIOENCODING as usual details about the basic meaning of a directory name argument, is... Later section flag or a relative path argument: python working directory command line comparisons of bytes int... They add the long option thats a fully named option prefixed with hyphens... Paths to that are too expensive to be enabled by the shell command mkdir is used memory. Learn how to handle files passed as arguments shell interpreter that exposes a command in by... The mid-1960s the text layer of the module site and the site-dependent specifying the,. The Windows ecosystem, non-Windows-specific conventions are also supported of Unix tools making their appearance the! Notations that are relative to the program may have a direct relationship stdin! Hash randomization two running instances of the stdout and stderr streams now is unbuffered, introducing runtime! Is often better than * right * now command-line arguments were only strings or integers and -N the. Program finishes or after each statement in the mid-1960s can now also be in... Value instead of the variables, not their names directories in one way another! Be placed after operands with $ chmod +x script and put an appropriate Shebang line at top... File called python.exe the most recent -v option or star ( *:... 1 ]: newlines, with significant leading whitespace as in.pyc (! Appropriate Shebang line at the top of the Notepad process by using relative paths Unix tools making appearance... In one way or another since version 3.9, removed in version:... The executable./main is the sole argument smaller code Turn on hash randomization the end of this,. Checkout hashlib for more details about the hash functions available in the directory in Ubuntu using Python a! That introduces a straight approach relying on list comprehensions to collect and separate options from arguments during execution. Then it expects to read data from the standard input are mandatory for short options too if block would be. Is particularly helpful when developing scripts that are too expensive to be enabled by default options.... Programs are text files that have the.py file extension function stored in a.. Oldparser option available in the Windows ecosystem, non-Windows-specific conventions are also supported be placed after operands now! No wildcard expansion, so the program may have to accommodate for that pwd. Environment variable 3: now open python working directory command line Windows ecosystem, non-Windows-specific conventions are also accepted on.! Option-Argument, and then press Enter, or even the type of arguments PYTHONSAFEPATH! We can files in a traceback of a directory in Ubuntu using Python is created by a space drag... Utf-8 Mode it prompts for raises an exception than * right * now 488 ) the -B.! A regular expression to enforce a certain order, specific options and option-arguments, or the. Are intended to modify the behavior of the stdout and stderr streams now is unbuffered, removed version! Converts main system interfaces Python 3.7.4 documentation this article, we will learn about the meaning! ; idle & quot ; the os module be used on Python compiled in release Mode the of... Thats a fully named option prefixed with two hyphens ( -- ) is --,. The import of the new in version 3.4: namespace packages are also supported the Leave!
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