Basic Calculator Program In Python

I just wrote a simple calculator script in python, generally python should recognize the (-)minus,(*)multiplication,(/)divide sign by default but while considering this script it's

Solution 1:

You need to change your inputs, strings to integer or float. Since, there is division you are better change it to float.

a=int(raw_input("Enter the value of a:"))
a=float(raw_input("Enter the value of a:"))

Solution 2:

When you get the input it is a string. The + operator is defined for strings, which is why it works but the others don't. I suggest using a helper function to safely get an integer (if you are doing integer arithmetic).

defget_int(prompt):
    whileTrue:
        try:
            returnint(raw_input(prompt))
        except ValueError, e:
            print"Invalid input"

a = get_int("Enter the value of a: ")

Solution 3:

Billwild said u should change to make your variables integers. But why not float. It is not important if it is integer or float it must be number type. Raw_input takes any input like string.

a=float(raw_input('Enter the value of a: '))

Or for Tim's aproach

defget_float(prompt):
    whileTrue:
        try:
            returnfloat(raw_input(prompt))
        except ValueError, e:
            print"Invalid input"

a = get_float("Enter the value of a: ")

You can always convert result to float or to int or back. It is just matter what kind of calculator u are programming.