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-rw-r--r--src/click/types.py10
1 files changed, 7 insertions, 3 deletions
diff --git a/src/click/types.py b/src/click/types.py
index b7161d9..721c556 100644
--- a/src/click/types.py
+++ b/src/click/types.py
@@ -497,11 +497,15 @@ class BoolParamType(ParamType):
def convert(self, value, param, ctx):
if isinstance(value, bool):
return bool(value)
- value = value.lower()
- if value in {"1", "true", "t", "yes", "y", "on"}:
+
+ norm = value.strip().lower()
+
+ if norm in {"1", "true", "t", "yes", "y", "on"}:
return True
- elif value in {"0", "false", "f", "no", "n", "off"}:
+
+ if norm in {"0", "false", "f", "no", "n", "off"}:
return False
+
self.fail(f"{value!r} is not a valid boolean value.", param, ctx)
def __repr__(self):