pythonOtherMedium

Total calculation failing with TypeError

Time: 0:00

What it should do

total_values(data) should add up a dictionary's values, so total_values({'a': 1, 'b': 2}) returns 3.

What goes wrong

total_values({'a': 1, 'b': 2}) raises TypeError: unsupported operand type(s) for +: 'int' and 'str'.

Hints

This is a mutation and copying bugs bug

Assignment does not copy, a shallow copy still shares its contents, and mutating methods return None.