Minor clarification of dedent().
diff --git a/Lib/textwrap.py b/Lib/textwrap.py
index ec0e7cb..754b037 100644
--- a/Lib/textwrap.py
+++ b/Lib/textwrap.py
@@ -334,16 +334,16 @@
lines = text.expandtabs().split('\n')
margin = None
for line in lines:
- content = len(line.lstrip())
+ content = line.lstrip()
if not content:
continue
- indent = len(line) - content
+ indent = len(line) - len(content)
if margin is None:
margin = indent
else:
margin = min(margin, indent)
- if margin is not None:
+ if margin is not None and margin > 0:
for i in range(len(lines)):
lines[i] = lines[i][margin:]