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-rw-r--r--src/pip/_internal/req/req_file.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/pip/_internal/req/req_file.py b/src/pip/_internal/req/req_file.py
index 4f61f3cfd..d7e40729d 100644
--- a/src/pip/_internal/req/req_file.py
+++ b/src/pip/_internal/req/req_file.py
@@ -23,7 +23,7 @@ from pip._internal.req.constructors import (
__all__ = ['parse_requirements']
SCHEME_RE = re.compile(r'^(http|https|file):', re.I)
-COMMENT_RE = re.compile(r'\s*#.*$')
+COMMENT_RE = re.compile(r'(^|\s+)#.*$')
# Matches environment variable-style values in '${MY_VARIABLE_1}' with the
# variable name consisting of only uppercase letters, digits or the '_'