In this case you also need to specify the default set of fixers, called all: This makes finding the correct pattern a lot easier and really helps to simplify the making of fixes. To include both patterns in the same fixer we separate them with a character:. Ok thank you will try now thanks again: However, the parser itself cares very much about Python grammar and will in general raise an error if it is fed invalid Python code. The directory for lib2to3 is located in: Node objects are containers that contain a series of objects, both Node and Leaf , while Leaf objects have no sub objects and contain the actual code.

python lib2to3

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Enter search terms or a module, class or function name. So I have put down my experiences from writing zope. Could you provide a few extra lin2to3 please?

python lib2to3

Partial outdent, we find the indentation level and drop higher indents. Writing Python compatible code cheat sheet and What else you need to know for more info. Porting philosophy Why write Python 3-style code?

I have python 3. Also add “Programming Language:: Find Quote metulburr The Castle of aaarrrrggh Posts: You can also type in a code snippet as an argument, but that becomes fiddly for multi-line snippets. PyCharm Community Edition.


The suffix of a node is the same as the prefix of the next node and can pytuon ignored.

python lib2to3

If you would like futurize to import all the changed builtins to have their Python 3 semantics on Python 2, invoke it like this:. We can do that by assigning a name to it. The finished pattern then becomes:.

python lib2to3

No module named pymysql – On Apache2 for Python 2. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. GhostFrag1 GhostFrag1 2 2 gold badges 7 7 silver badges 19 19 bronze badges.

That dictionary will have the key pib2to3 which contains the node that matches all of the pattern and it will also contain they key ‘importname’ which contains just the CONSTANT node. When you replace a node you need to make sure to preserve the prefix, or both white-space and comments may disappear:.

Extending 2to3 with your own fixers — Supporting Python 3: An in-depth guide

The goal for this step is to get the tests passing first on Py3 and then on Py2 again with the help of the future package. This can be used both for the explicit fixers included in 2to3 and external fixers, such as the fixers needed if you use the Zope Component Architecture. If you remove the -w flag, the file does not get converted at all. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information.


You can for example let the match method return a list of sub-nodes to be transformed. That will make Distribute look in the package for tests to run. Thanks for any help. To simplify the task of making a fixer there is a BaseFix class you can use.

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It should be uncontroversial and safe to apply to every Python 2 package. In this case you also need to specify the default set of fixers, called all: In simple cases, this is easier than it sounds, while in complex cases it can be more tricky than expected.

As a minimal example we can take a pattern based version of the fixer that renamed oldname to newname.

Having many unit tests is crucial to you make sure all the edge cases work. If you have a very complex setup. Lib2to default, the conversion uses all fixers in the lib2to3.