Unstring an equation that consist of integers and primitives

Question

Input:

1st integer given: 3, 
2nd integer given: 2, 
Primitives given in a STRING: '+'

Expected output:

5

Since 3+2=5

My approach:

str(3)+ '+' + str(2)  --> '3+2'
int('3+2') --> Wishfully thinking: 5

As expected, I will get ValueError: invalid literal for int() with base 10: '3+2'.

Any idea how can I approach this? I must use all the input given, meaning I must use the primitives in the string ('+')

Thanks!!

Answer 1

Use eval:

first = raw_input('1st integer given: ')
second = raw_input('2nd integer given: ')
primitives = raw_input('Primitives given in a STRING: ')

equation = first+primitives+second
answer = eval(equation)
print answer

Runs as:

1st integer given: 3
2nd integer given: 2
Primitives given in a STRING: +
5

Or:

1st integer given: 99
2nd integer given: 9
Primitives given in a STRING: /
11