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ast
~~~
The `ast` module helps Python applications to process trees of the Python
abstract syntax grammar. The abstract syntax itself might change with
each Python release; this module helps to find out programmatically what
the current grammar looks like and allows modifications of it.
An abstract syntax tree can be generated by passing `ast.PyCF_ONLY_AST` as
a flag to the `compile()` builtin function or by using the `parse()`
function from this module. The result will be a tree of objects whose
classes all inherit from `ast.AST`.
A modified abstract syntax tree can be compiled into a Python code object
using the built-in `compile()` function.
Additionally various helper functions are provided that make working with
the trees simpler. The main intention of the helper functions and this
module in general is to provide an easy to use interface for libraries
that work tightly with the python syntax (template engines for example).
:copyright: Copyright 2008 by Armin Ronacher.
:license: Python License.
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Parse the source into an AST node.
Equivalent to compile(source, filename, mode, PyCF_ONLY_AST).
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Evaluate an expression node or a string containing only a Python
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sets, booleans, and None.
Caution: A complex expression can overflow the C stack and cause a crash.
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Return a formatted dump of the tree in node. This is mainly useful for
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the returned string will show the names and the values for fields.
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omitting unambiguous field names. Attributes such as line
numbers and column offsets are not dumped by default. If this is wanted,
include_attributes can be set to true. If indent is a non-negative
integer or string, then the tree will be pretty-printed with that indent
level. None (the default) selects the single line representation.
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Copy source location (`lineno`, `col_offset`, `end_lineno`, and `end_col_offset`
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recursively where not already set, by setting them to the values of the
parent node. It works recursively starting at *node*.
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Increment the line number and end line number of each node in the tree
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Yield all direct child nodes of *node*, that is, all fields that are nodes
and all items of fields that are lists of nodes.
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Return the docstring for the given node or None if no docstring can
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A node visitor base class that walks the abstract syntax tree and calls a
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methods.
Per default the visitor functions for the nodes are ``'visit_'`` +
class name of the node. So a `TryFinally` node visit function would
be `visit_TryFinally`. This behavior can be changed by overriding
the `visit` method. If no visitor function exists for a node
(return value `None`) the `generic_visit` visitor is used instead.
Don't use the `NodeVisitor` if you want to apply changes to nodes during
traversing. For this a special visitor exists (`NodeTransformer`) that
allows modifications.
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A :class:`NodeVisitor` subclass that walks the abstract syntax tree and
allows modification of nodes.
The `NodeTransformer` will walk the AST and use the return value of the
visitor methods to replace or remove the old node. If the return value of
the visitor method is ``None``, the node will be removed from its location,
otherwise it is replaced with the return value. The return value may be the
original node in which case no replacement takes place.
Here is an example transformer that rewrites all occurrences of name lookups
(``foo``) to ``data['foo']``::
class RewriteName(NodeTransformer):
def visit_Name(self, node):
return Subscript(
value=Name(id='data', ctx=Load()),
slice=Constant(value=node.id),
ctx=node.ctx
)
Keep in mind that if the node you're operating on has child nodes you must
either transform the child nodes yourself or call the :meth:`generic_visit`
method for the node first.
For nodes that were part of a collection of statements (that applies to all
statement nodes), the visitor may also return a list of nodes rather than
just a single node.
Usually you use the transformer like this::
node = YourTransformer().visit(node)
c C s� t |�D ]P\}}t|t�r:g }|D ]!}t|t�r-| �|�}|d u r"qt|t�s-|�|� q|�|� q||d d �< qt|t�rT| �|�}|d u rNt||� qt|||� q|S r$ ) r} r r6 rW r� r� rZ �delattrrp )r� r r| � old_valueZ
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