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-rw-r--r--pylint/checkers/strings.py5
1 files changed, 4 insertions, 1 deletions
diff --git a/pylint/checkers/strings.py b/pylint/checkers/strings.py
index c287298c7..bb7e7d638 100644
--- a/pylint/checkers/strings.py
+++ b/pylint/checkers/strings.py
@@ -677,11 +677,14 @@ class StringConstantChecker(BaseTokenChecker):
self.process_string_token(token, start_row)
def process_string_token(self, token, start_row):
+ quote_char = None
for i, c in enumerate(token):
if c in "'\"":
quote_char = c
break
- # pylint: disable=undefined-loop-variable
+ if quote_char is None:
+ return None
+
prefix = token[:i].lower() # markers like u, b, r.
after_prefix = token[i:]
if after_prefix[:3] == after_prefix[-3:] == 3 * quote_char: