home *** CD-ROM | disk | FTP | other *** search
- """ Fixer for imports of itertools.(imap|ifilter|izip|ifilterfalse) """
-
- # Local imports
- from .. import fixer_base
- from ..fixer_util import BlankLine
-
- class FixItertoolsImports(fixer_base.BaseFix):
- PATTERN = """
- import_from< 'from' 'itertools' 'import' imports=any >
- """ %(locals())
-
- def transform(self, node, results):
- imports = results['imports']
- children = imports.children[:] or [imports]
- for child in children:
- if not hasattr(child, 'value'):
- # Handle 'import ... as ...'
- continue
- if child.value in ('imap', 'izip', 'ifilter'):
- # The value must be set to none in case child == import,
- # so that the test for empty imports will work out
- child.value = None
- child.remove()
- elif child.value == 'ifilterfalse':
- node.changed()
- child.value = 'filterfalse'
-
- # Make sure the import statement is still sane
- children = imports.children[:] or [imports]
- remove_comma = True
- for child in children:
- if remove_comma and getattr(child, 'value', None) == ',':
- child.remove()
- else:
- remove_comma ^= True
-
- if unicode(children[-1]) == ',':
- children[-1].remove()
-
- # If there are no imports left, just get rid of the entire statement
- if not (imports.children or getattr(imports, 'value', None)):
- p = node.get_prefix()
- node = BlankLine()
- node.prefix = p
- return node
-