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Fix exception causes in helpers.py #802

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merged 1 commit into from
Jun 20, 2020
Merged

Fix exception causes in helpers.py #802

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8 changes: 4 additions & 4 deletions astroid/helpers.py
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Original file line number Diff line number Diff line change
Expand Up @@ -190,9 +190,9 @@ def _type_check(type1, type2):
return False
try:
return type1 in type2.mro()[:-1]
except exceptions.MroError:
except exceptions.MroError as e:
# The MRO is invalid.
raise exceptions._NonDeducibleTypeHierarchy
raise exceptions._NonDeducibleTypeHierarchy from e


def is_subtype(type1, type2):
Expand Down Expand Up @@ -261,10 +261,10 @@ def object_len(node, context=None):

try:
len_call = next(node_type.igetattr("__len__", context=context))
except exceptions.AttributeInferenceError:
except exceptions.AttributeInferenceError as e:
raise exceptions.AstroidTypeError(
"object of type '{}' has no len()".format(node_type.pytype())
)
) from e

result_of_len = next(len_call.infer_call_result(node, context))
if (
Expand Down