Code:
import math
while True:
String_Var = raw_input ('Add, Divide, Multiply, Subtract, Square, Square Root, Index Notation, or Quit? ').lower()
if 'add' in String_Var:
try:
Var1 = float(raw_input ('Number 1: '))
Var2 = float(raw_input ('Number 2: '))
except:
print 'Invalid input, numbers
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