Implement #15

PythonHome/Lib/lib2to3/fixes/fix_zip.py

@@ -0,0 +1,35 @@
+"""
+Fixer that changes zip(seq0, seq1, ...) into list(zip(seq0, seq1, ...)
+unless there exists a 'from future_builtins import zip' statement in the
+top-level namespace.
+
+We avoid the transformation if the zip() call is directly contained in
+iter(<>), list(<>), tuple(<>), sorted(<>), ...join(<>), or for V in <>:.
+"""
+
+# Local imports
+from .. import fixer_base
+from ..fixer_util import Name, Call, in_special_context
+
+class FixZip(fixer_base.ConditionalFix):
+
+    BM_compatible = True
+    PATTERN = """
+    power< 'zip' args=trailer< '(' [any] ')' >
+    >
+    """
+
+    skip_on = "future_builtins.zip"
+
+    def transform(self, node, results):
+        if self.should_skip(node):
+            return
+
+        if in_special_context(node):
+            return None
+
+        new = node.clone()
+        new.prefix = u""
+        new = Call(Name(u"list"), [new])
+        new.prefix = node.prefix
+        return new