44 lines
1.4 KiB
Python
44 lines
1.4 KiB
Python
""" Fixer for imports of itertools.(imap|ifilter|izip|ifilterfalse) """
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# Local imports
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from . import basefix
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from .util import BlankLine
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class FixItertoolsImports(basefix.BaseFix):
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PATTERN = """
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import_from< 'from' 'itertools' 'import' imports=any >
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""" %(locals())
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def transform(self, node, results):
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imports = results['imports']
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children = imports.children[:] or [imports]
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for child in children:
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if not hasattr(child, 'value'):
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# Handle 'import ... as ...'
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continue
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if child.value in ('imap', 'izip', 'ifilter'):
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child.remove()
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elif child.value == 'ifilterfalse':
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node.changed()
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child.value = 'filterfalse'
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# Make sure the import statement is still sane
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children = imports.children[:] or [imports]
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remove_comma = True
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for child in children:
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if remove_comma and getattr(child, 'value', None) == ',':
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child.remove()
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else:
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remove_comma ^= True
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if unicode(children[-1]) == ',':
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children[-1].remove()
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# If there is nothing left, return a blank line
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if not (imports.children or getattr(imports, 'value', None)):
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new = BlankLine()
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new.prefix = node.get_prefix()
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else:
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new = node
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return new
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