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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).
Pass type_comments=True to get back type comments where the syntax allows.
N)_feature_version)
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Evaluate an expression node or a string containing only a Python
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Python literal structures: strings, bytes, numbers, tuples, lists, dicts,
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
debugging purposes. If annotate_fields is true (by default),
the returned string will show the names and the values for fields.
If annotate_fields is false, the result string will be more compact by
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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When you compile a node tree with compile(), the compiler expects lineno and
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parent node. It works recursively starting at *node*.
c d| j v r t | d s|| _ n| j }d| j v r t | dd || _ n| j }d| j v r t | d s|| _ n| j }d| j v r t | dd || _ n| j }t | D ]} ||||| d S )Nr" r r r )rs r r" r$ r r r iter_child_nodes)r& r" r r r child_fixs r r z#fix_missing_locations.._fix s t' ' '4**
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Increment the line number and end line number of each node in the tree
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location in a file.
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Yield a tuple of ``(fieldname, value)`` for each field in ``node._fields``
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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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will be raised.
If *clean* is `True`, all tabs are expanded to spaces and any whitespace
that can be uniformly removed from the second line onwards is removed.
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