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minor performance improvement (~2% speedup in unit tests) (#858)

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This commit is contained in:
Michael Flaxman 2019-05-21 22:02:17 -05:00 committed by Jelle Zijlstra
parent a4399f3054
commit cbe455ad66
1 changed files with 5 additions and 5 deletions
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10
black.py
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@ -707,7 +707,7 @@ def format_str(src_contents: str, *, mode: FileMode) -> FileContent:
`line_length` determines how many characters per line are allowed.
"""
src_node = lib2to3_parse(src_contents.lstrip(), mode.target_versions)
dst_contents = ""
dst_contents = []
future_imports = get_future_imports(src_node)
if mode.target_versions:
versions = mode.target_versions
@ -730,15 +730,15 @@ def format_str(src_contents: str, *, mode: FileMode) -> FileContent:
}
for current_line in lines.visit(src_node):
for _ in range(after):
dst_contents += str(empty_line)
dst_contents.append(str(empty_line))
before, after = elt.maybe_empty_lines(current_line)
for _ in range(before):
dst_contents += str(empty_line)
dst_contents.append(str(empty_line))
for line in split_line(
current_line, line_length=mode.line_length, features=split_line_features
):
dst_contents += str(line)
return dst_contents
dst_contents.append(str(line))
return "".join(dst_contents)
def decode_bytes(src: bytes) -> Tuple[FileContent, Encoding, NewLine]: