How to calculate percentages in Python

user_15213806 0
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I am making a program in Python to determine the percentage of my marks in various subjects. It is supposed to ask me for my marks and find the percentage but something is wrong. I am rather young, so please don't laugh at my attempt:

import os
import time
print ("This is a program to calculate your percentage in your ACADEMICS ")
time.sleep(2)

english = input("Enter your english marks \n \t")
time.sleep(1)

maths = input ("Enter your maths marks \n \t")
time.sleep(1)

science= input ("Enter your science marks \n \t")
time.sleep(1)

print ("OK, i am reviewing your marks, ")
time.sleep(1)
print ("Hmm, verry poor marks, but here is your %")

percentage = english + maths + science /3
print(percentage)

but in the end it says that

Traceback (most recent call last):
  File "C:/Users/COOL BOY/Desktop/percentage.py", line 18, in <module>
    percentage = english + maths + science %3
TypeError: not all arguments converted during string formatting

What am I doing wrong here?

percentage division python
5 Answers

The input function returns a string. When computing english + maths + science /3 you are adding strings ! You should convert your inputs to numbers via the int(string) or float(string) functions. You can also check whether your strings is made of digit with 'mystring'.isdigit().

user_144769670

Convert string to int when asking for inputs, when calculating you are using strings instead of ints.

import os
import time
print ("This is a program to calculate your percentage in your ACADEMICS ")
time.sleep(2)


english = int(input("Enter your english marks \n \t"))
time.sleep(1)

maths = int(input("Enter your maths marks \n \t"))
time.sleep(1)


science= int(input("Enter your science marks \n \t"))
time.sleep(1)


print ("OK, i am reviewing your marks, ")
time.sleep(1)
print ("Hmm, verry poor marks, but here is your %")

percentage = (english + maths + science) /3
print(percentage)
user_121320970

  1. Input should be casted by int Ex: int(input("number"))

  2. Considering MaxScore for a subject is 100 the formula would be

    percentage=(aquaired marks of all 3 subjects)x100/(3*100)

  3. Percentage should be rounded up by last 2 digits.

The final program would be.

import os
import time

maxscore = 100
totalsubjects=3

print ("This is a program to calculate your percentage in your ACADEMICS ")
time.sleep(2)


english = int(input("Enter your english marks \n \t"))
time.sleep(1)

maths = int(input("Enter your maths marks \n \t"))
time.sleep(1)


science= int(input("Enter your science marks \n \t"))
time.sleep(1)


print ("OK, i am reviewing your marks, ")
time.sleep(1)
print ("Hmm, verry poor marks, but here is your %")

percentage = (english + maths + science)*100/(maxscore*totalsubjects)
print(round(percentage,2))
user_49152880

the pythonic way

import os, time

def get_subject_score(sub):
    time.sleep(2)
    return int(input(f"Enter your {sub} marks : "))  # int or float as you wish

print("This is a program to calculate your percentage in your ACADEMICS")

english = get_subject_score("english")
maths = get_subject_score("math")
science = get_subject_score("science")

print(f"OK, i am reviewing your marks, {(english + maths + science) / 3}")
user_125399350
  1. When ur taking integrer as input it should be int(input()) instead of input() as later takes input as string
  2. To Calculate Percentage its should be Percentage = (Sum Of Aquired Marks)Max Marks/(3Max Marks)

Assuming 100 As Marks *Percentage = (english + maths + science)100/(3*100)

user_140327600
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