[SOLVED] How to get integer or float values from a string in Python?

Question

Hi,
I want to create a program with Python that can calculate fahrenheit to celsius and celsius to fahrenheit according to user input.

If the user gives 10C as string input, then the program will understand that the user wants to convert 10° Celsius (C) to Fahrenheit (F) (because user inputted C after 10). And then the program will take 10 as an integer or float and it will convert 10° celsius to fahrenheit.

In the same way, if the user gives 10F as input, then the program will understand that the user wants to convert 10° Fahrenheit (F) to Fahrenheit (C) (because user inputted F after 10). And then the program will take 10 as an integer or float and it will convert 10° fahrenheit to celcius.

If I want to do this, I have to take only 10 as integer or faulting number from the sting input 10C or 10F given by the user. How do I do it now?

Example:
1. Input : 15.6C

Expected Output:
>>> 50.9°F

2. Input : 50.9F

Expected Output:
>>> 15.6°C

[SOLVED]
https://code.sololearn.com/cX53nLKNXOk2/?ref=app

Answer 1

Using regex.

a=input()

import re

b=re.match("\d+.\d+",a)
print(b[0])

Answer 2

MD. Ferdous Ibne Abu Bakar ,

there is also a possible solution to do it without regex, even if this is the preferred way.

but before we can help you to solve this task, we need to see your code to find out where the issue is. so please post us your attempt. it does not matter if your try is working perfectly or not.

thanks for your understanding!

Answer 3

Shadoff ,

great and clean code! the only doubt i have is that the code uses int(....) to convert number part of input. the input sample shows a decimal place like 15.6C. in this case the int conversion will fail. from my point of view float(...) would be better.

Answer 4

if thats the set format you can slice the string like string[:-1]

Answer 5

x = input()
if x.endswith("F"):
int(x[:-1]) do something
elif x.endswith("C"):
int(x[:-1]) do another thing
else:
print("incorrect input, try again")

Answer 6

Set your input as a string, IE:
temperature = input() or 15.6C

Take all of the string input except the last char from temperature and turn it into a float, IE:
value = float(temperature[0:-1]

Then slice the last char from the input and compare using if /else, IE:
if temperature[-1] == "C":
print(your formula here)
elif -> as above == "F":
print(your formula here)
else:
print(optional statements if required)

Answer 7

MD. Ferdous Ibne Abu Bakar little correction in pattern,

b=re.match("\d+[.]\d+|\d+",a)

In previous pattern , since . is treated as any character it would match a input like 12a45 as well . You need to put it inside square brackets so that is interpreted literally as ".".

Also | stands for or . Either it will match float or integer pattern (\d+).

Answer 8

Shadoff
Niiice!
Much cleaner solution

Answer 9

Show your try. And I'll give you code sweet pie

Answer 10

Shadoff Thanks man 😀

Answer 11

Lothar you are right

Answer 12

MD. Ferdous Ibne Abu Bakar , in that case your code will be:
https://code.sololearn.com/cwLA71eUsmzj/?ref=app

Answer 13

https://code.sololearn.com/cw9ehw1jHL40/?ref=app

Answer 14

A little bug in my code.
If I input input 10ABC it also run!!! 😐

Help me to fix it!!!

https://code.sololearn.com/cX53nLKNXOk2/?ref=app

Answer 15

Thank you 🥰🥰 Shadoff

Answer 16

Wait as i post my code

Answer 17

Thanks

Answer 18

Thanks you very much guys... 😍🥰
Finally I made this↓↓
https://code.sololearn.com/cX53nLKNXOk2/?ref=app

Answer 19

Chris Jonathan nice,