diff options
Diffstat (limited to 'Lib/dataclasses.py')
| -rw-r--r-- | Lib/dataclasses.py | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/Lib/dataclasses.py b/Lib/dataclasses.py index 363d0b66d2..cbba320e01 100644 --- a/Lib/dataclasses.py +++ b/Lib/dataclasses.py @@ -930,6 +930,7 @@ def _process_class(cls, init, repr, eq, order, unsafe_hash, frozen, # we can. cls_fields = [] # Get a reference to this module for the _is_kw_only() test. + KW_ONLY_seen = False dataclasses = sys.modules[__name__] for name, type in cls_annotations.items(): # See if this is a marker to change the value of kw_only. @@ -939,6 +940,10 @@ def _process_class(cls, init, repr, eq, order, unsafe_hash, frozen, _is_kw_only))): # Switch the default to kw_only=True, and ignore this # annotation: it's not a real field. + if KW_ONLY_seen: + raise TypeError(f'{name!r} is KW_ONLY, but KW_ONLY ' + 'has already been specified') + KW_ONLY_seen = True kw_only = True else: # Otherwise it's a field of some type. |