diff options
Diffstat (limited to 'pint')
| -rw-r--r-- | pint/registry_helpers.py | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/pint/registry_helpers.py b/pint/registry_helpers.py index 5217095..970f2ef 100644 --- a/pint/registry_helpers.py +++ b/pint/registry_helpers.py @@ -214,7 +214,7 @@ def wraps(ureg, ret, args, strict=True): args = (args,) for arg in args: - if not isinstance(arg, (ureg.Unit, str)): + if arg is not None and not isinstance(arg, (ureg.Unit, str)): raise TypeError( "wraps arguments must by of type str or Unit, not %s (%s)" % (type(arg), arg) @@ -225,14 +225,14 @@ def wraps(ureg, ret, args, strict=True): is_ret_container = isinstance(ret, (list, tuple)) if is_ret_container: for arg in ret: - if not isinstance(arg, (ureg.Unit, str)): + if arg is not None and not isinstance(arg, (ureg.Unit, str)): raise TypeError( "wraps 'ret' argument must by of type str or Unit, not %s (%s)" % (type(arg), arg) ) ret = ret.__class__([_to_units_container(arg, ureg) for arg in ret]) else: - if not isinstance(ret, (ureg.Unit, str)): + if ret is not None and not isinstance(ret, (ureg.Unit, str)): raise TypeError( "wraps 'ret' argument must by of type str or Unit, not %s (%s)" % (type(ret), ret) |