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25.4. 2to3 - Automated Python 2 to 3 code translationВ¶2to3 is a Python program that reads Python 2.x source code and applies a series of fixers to transform it into val > lib2to3 is, however, a flexible and generic library, so it is possible to write your own fixers for 2to3. lib2to3 could also be adapted to custom applications in which Python code needs to be edited automatically.25.4.1. Using 2to3В¶2to3 will usually be installed with the Python interpreter as a script. It is also located in the Tools/scripts directory of the Python root.2to3вЂ™s basic arguments are a list of files or directories to transform. The directories are recursively traversed for Python sources.Here is a sample Python 2.x source file, example.py :It can be converted to Python 3.x code via 2to3 on the command line:A diff against the original source file is printed. 2to3 can also write the needed modifications right back to the source file. (A backup of the original file is made unless -n is also given.) Writing the changes back is enabled with the -w flag:After transformation, example.py looks like this:Comments and exact indentation are preserved throughout the translation process.By default, 2to3 runs a set of predefined fixers . The -l flag lists all available fixers. An explicit set of fixers to run can be given with -f . Likewise the -x explicitly disables a fixer. The following example runs only the imports and has_key fixers:This command runs every fixer except the apply fixer:Some fixers are explicit , meaning they arenвЂ™t run by default and must be listed on the command line to be run. Here, in addition to the default fixers, the idioms fixer is run:Notice how passing all enables all default fixers.Sometimes 2to3 will find a place in your source code that needs to be changed, but 2to3 cannot fix automatically. In this case, 2to3 will print a warning beneath the diff for a file. You should address the warning in order to have compliant 3.x code.2to3 can also refactor doctests. To enable this mode, use the -d flag. Note that only doctests will be refactored. This also doesnвЂ™t require the module to be valid Python. For example, doctest like examples in a reST document could also be refactored with this option.The -v option enables output of more information on the translation process.Since some print statements can be parsed as function calls or statements, 2to3 cannot always read files containing the print function. When 2to3 detects the presence of the from __future__ import print_function compiler directive, it modifies its internal grammar to interpret print() as a function. This change can also be enabled manually with the -p flag. Use -p to run fixers on code that already has had its print statements converted.The -o or --output-dir option allows specification of an alternate directory for processed output files to be written to. The -n flag is required when using this as backup files do not make sense when not overwriting the input files.New in version 2.7.3: The -o option was added.The -W or --write-unchanged-files flag tells 2to3 to always write output files even if no changes were required to the file. This is most useful with -o so that an entire Python source tree is copied with translation from one directory to another. This option implies the -w flag as it would not make sense otherwise.New in version 2.7.3: The -W flag was added.The --add-suffix option specifies a string to append to all output filenames. The -n flag is required when specifying this as backups are not necessary when writing to different filenames. Example:Will cause a converted file named example.py3 to be written.New in version 2.7.3: The --add-suffix option was added.To translate an entire project from one directory tree to another use:25.4.2. FixersВ¶Each step of transforming code is encapsulated in a fixer. The command 2to3 -l lists them. As documented above , each can be turned on and off individually. They are described here in more detail.Removes usage of apply() . For example apply(function, *args, **kwargs) is converted to function(*args, **kwargs) .Replaces deprecated unittest method names with the correct ones.

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