asottile / Astpretty
Licence: mit
Pretty print the output of python stdlib `ast.parse`.
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astpretty
Pretty print the output of python stdlib ast.parse.
astpretty is intended to be a replacement for ast.dump.
Installation
pip install astpretty
Usage
astpretty provides two api functions:
astpretty.pprint(node, indent=FOUR_SPACE_INDENT, show_offsets=True)
Print a representation of the ast node.
>>> astpretty.pprint(ast.parse('if x == y: y += 4').body[0])
If(
lineno=1,
col_offset=0,
test=Compare(
lineno=1,
col_offset=3,
left=Name(lineno=1, col_offset=3, id='x', ctx=Load()),
ops=[Eq()],
comparators=[Name(lineno=1, col_offset=8, id='y', ctx=Load())],
),
body=[
AugAssign(
lineno=1,
col_offset=11,
target=Name(lineno=1, col_offset=11, id='y', ctx=Store()),
op=Add(),
value=Num(lineno=1, col_offset=16, n=4),
),
],
orelse=[],
)
indent allows control over the indentation string:
>>> astpretty.pprint(ast.parse('if x == y: y += 4').body[0], indent=' ')
If(
lineno=1,
col_offset=0,
test=Compare(
lineno=1,
col_offset=3,
left=Name(lineno=1, col_offset=3, id='x', ctx=Load()),
ops=[Eq()],
comparators=[Name(lineno=1, col_offset=8, id='y', ctx=Load())],
),
body=[
AugAssign(
lineno=1,
col_offset=11,
target=Name(lineno=1, col_offset=11, id='y', ctx=Store()),
op=Add(),
value=Num(lineno=1, col_offset=16, n=4),
),
],
orelse=[],
)
show_offsets controls whether the output includes line / column information:
>>> astpretty.pprint(ast.parse('x += 5').body[0], show_offsets=False)
AugAssign(
target=Name(id='x', ctx=Store()),
op=Add(),
value=Num(n=5),
)
astpretty.pformat(node, indent=FOUR_SPACE_INDENT, show_offsets=True)
Return a string representation of the ast node.
Arguments are identical to astpretty.pprint.
>>> astpretty.pformat(ast.parse('if x == y: y += 4').body[0])
"If(\n lineno=1,\n col_offset=0,\n test=Compare(\n lineno=1,\n col_offset=3,\n left=Name(lineno=1, col_offset=3, id='x', ctx=Load()),\n ops=[Eq()],\n comparators=[Name(lineno=1, col_offset=8, id='y', ctx=Load())],\n ),\n body=[\n AugAssign(\n lineno=1,\n col_offset=11,\n target=Name(lineno=1, col_offset=11, id='y', ctx=Store()),\n op=Add(),\n value=Num(lineno=1, col_offset=16, n=4),\n ),\n ],\n orelse=[],\n)"
Comparison with stdlib ast.dump
>>> print(ast.dump(ast.parse('if x == y: y += 4').body[0]))
If(test=Compare(left=Name(id='x', ctx=Load()), ops=[Eq()], comparators=[Name(id='y', ctx=Load())]), body=[AugAssign(target=Name(id='y', ctx=Store()), op=Add(), value=Num(n=4))], orelse=[])
typed-ast support
astpretty works with typed-ast!
For usage with typed-ast make sure you have typed-ast installed, a
convenient way to do this is with the typed extra to astpretty:
pip install astpretty[typed]
The apis above work equally well with the return values from the ast modules
provided by typed_ast:
>>> import astpretty
>>> from typed_ast import ast3
>>> astpretty.pprint(ast3.parse('x = 4 # type: int'))
Module(
body=[
Assign(
lineno=1,
col_offset=0,
targets=[Name(lineno=1, col_offset=0, id='x', ctx=Store())],
value=Num(lineno=1, col_offset=4, n=4),
type_comment='int',
),
],
type_ignores=[],
)
With typed-ast installed, the commandline interface adds --typed-27 and
--typed-3 options for using the alternative ast parsers:
$ astpretty --typed-3 t.py
Module(
body=[
Assign(
lineno=1,
col_offset=0,
targets=[Name(lineno=1, col_offset=0, id='x', ctx=Store())],
value=Num(lineno=1, col_offset=4, n=4),
type_comment='int',
),
],
type_ignores=[],
)
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