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Update arithmetic_arranger.py #3

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Update arithmetic_arranger.py #3

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2 changes: 1 addition & 1 deletion arithmetic_arranger.py
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Original file line number Diff line number Diff line change
Expand Up @@ -6,7 +6,7 @@ def arithmetic_arranger(problems, val=False):

# list of all operations in str format
operations = list(map(lambda x: x.split()[1], problems))
if set(operations) != {'+', '-'} and len(set(operations)) != 2:
if set(operations) not in [{'+'}, {'-'}, {'+', '-'}] and len(set(operations)) > 2:
arranged_problems = "Error: Operator must be '+' or '-'."
return arranged_problems

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