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Return an informative error message when spec should be a list #62

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Return an informative error message when spec should be a list #62

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11 changes: 10 additions & 1 deletion glom/core.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1116,7 +1116,16 @@ def __subclasshook__(cls, C):


def _get_sequence_item(target, index):
return target[int(index)]
try:
return target[int(index)]
except ValueError as e:
if 'invalid literal for int() with base 10:' in str(e):
msg = ("Error indexing the target. This can happen when your "
"target is a list and your spec is not. Did you forget "
"to put brackets around your spec?")
raise ValueError(msg)
else:
raise e


# handlers are 3-arg callables, with args (spec, target, scope)
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