Error is finding mean of a list

[perfringo]

Python interactive interpreter is your best friend.

>>> a = []
>>> len(a)
0                               
>>> # source of ZeroDivsionError
>>> data = input('Please enter integers separated by comma: ').split(',')
Please enter integers separated by comma: 1,2,3
>>> data
['1', '2', '3']
>>> sum(int(i) for i in data)/len(data)
2.0                          
>>> # returns float
>>> import statistics.  
>>> # built-in module
>>> statistics.mean(int(i) for i in data)
2                          
>>> # returns int

I don't recommend to use capitalized built-ins as names.