python - How to check change between two values (in percent)? -

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i have 2 values (previous , current) , want check change between them (in percent):

(current/previous)*100

but if previous value 0 division zero, , if value not change 100%. 

def get_change(current, previous)     if current == previous:         return 100.0     try:        return (abs(current - previous))/previous)*100.0     except zerodivisionerror:         return 0

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