How to make python read input as a float?

Question

I need to take an input in the following form "score/max" (Example 93/100) and store it as a float variable. The problem I run into is that python does the division indicated by backslash and since the two numbers are integers, the result is 0. Even if I convert my input into a float the result is 0.0. Here is my code for reference:

#!/usr/bin/env python

exam1=float(input("Input the first test score in the form score/max:"))

If 93/100 is entered, exam1 variable will be equal to 0.0 instead of the intended 0.93.

Keep in mind that you need to handle the 'Divide by zero error' — Prakhar Londhe
– Prakhar Londhe, Commented Feb 24, 2020 at 4:33
93/100 is not a float. It you calculate its result then it can be interpreted as a float. — Klaus D.
– Klaus D., Commented Feb 24, 2020 at 4:36

Shubham Sharma · Accepted Answer · 2020-02-24 04:32:25Z

2

Note:

`input()`

reads a line from input, converts it to a string (stripping a trailing newline), and returns that.

You may want to try the following code,

string = input("Input the first test score in the form score/max: ")
scores = string.strip().split("/")
exam1 = float(scores[0]) / float(scores[1])

print(exam1)

Input:

Input the first test score in the form score/max: 93/100

Output:

0.93

answered Feb 24, 2020 at 4:32

Shubham Sharma

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2 Comments

Dante Over a year ago

The code you have provided does not work. The error that I get is the following: AttributeError: 'int' object has no attribute 'strip' I am using python 2.7 if that helps.

Shubham Sharma Over a year ago

if you are using python 2.7 just replace input with raw_input

Hymns For Disco · Accepted Answer · 2020-02-24 04:59:43Z

1

You could use python's fractions module, which knows how to read a fraction string

from fractions import Fraction
exam1 = float(Fraction(input("Input the first test score in the form score/max:")))

for Python 2.7, use raw_input instead of input

see Python 2.7 getting user input and manipulating as string without quotations

Input the first test score in the form score/max:93/100
>>> exam1
0.93

edited Feb 24, 2020 at 4:59

answered Feb 24, 2020 at 4:36

Hymns For Disco

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2 Comments

Dante Over a year ago

I still get 0.0 as my answer. I am using python 2.7 if that helps.

Hymns For Disco Over a year ago

@Dante in python 2.7, use raw_input instead of input stackoverflow.com/questions/4960208/…

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