[split] simple calculator

[perfringo]

There is built-in operator module what can be used to map operations to specific characters:

import operator

operations = {'+': operator.add,
              '-': operator.sub,
              '*': operator.mul,
              '/': operator.truediv,
              '**': operator.pow,
              '%': operator.mod,
             }

# usage
print(operations['+'](2, 3)) 
print(operations['-'](7, 2))   

For parsing input itertools.groupby can be used. We need keyfunc that keeps together digits and '.':

from itertools import groupby

inputs = ('1+2', '1.22+1', '4 + 2')

def keyfunc(symbol):
    return symbol.isdigit() or symbol == '.'

for item in inputs:
    stream = groupby(item, key=keyfunc)
    parsed = (''.join(item[1]).strip() for item in stream)
    print(*parsed, sep='\n')