kieranw kieranw - 1 month ago 10
Python Question

TypeError: unsupported operand type(s) for +=: 'int' and 'str'

I'm getting this error when reading from a file:

line 70 in main: score += points
TypeError: unsupported operand type(s) for +=: 'int' and 'str'


I'm taking an integer in the file and adding it to the variable
score
. The reading from the file is done in the
next_line
function which is then called in the
next_block
function.

I have tried converting both
score
and
points
to an integer which doesn't seem to work.

Here's the program code:

# Trivia Challenge
# Trivia game that reads a plain text file

import sys

def open_file(file_name, mode):
"""Open a file."""
try:
the_file = open(file_name, mode)
except IOError as e:
print("Unable to open the file", file_name, "Ending program.\n",e)
input("\n\nPress the enter key to exit.")
sys.exit()
else:
return the_file

def next_line(the_file):
"""Return next line from the trivia file, formatted."""
line = the_file.readline()
line = line.replace("/", "\n")
return line

def next_block(the_file):
"""Return the next block of data from the trivia file."""
category = next_line(the_file)

question = next_line(the_file)

answers = []
for i in range(4):
answers.append(next_line(the_file))

correct = next_line(the_file)
if correct:
correct = correct[0]

explanation = next_line(the_file)

points = next_line(the_file)

return category, question, answers, correct, explanation, points

def welcome(title):
"""Welcome the player and get his/her name."""
print("\t\tWelcome to Trivia Challenge!\n")
print("\t\t", title, "\n")

def main():
trivia_file = open_file("trivia.txt", "r")
title = next_line(trivia_file)
welcome(title)
score = 0

# get first block
category, question, answers, correct, explanation, points = next_block(trivia_file)
while category:
# ask a question
print(category)
print(question)
for i in range(4):
print("\t", i + 1, "-", answers[i])

# get answer
answer = input("What's your answer?: ")

# check answer
if answer == correct:
print("\nRight!", end= " ")
score += points
else:
print("\nWrong.", end= " ")
print(explanation)
print("Score:", score, "\n\n")

# get next block
category, question, answers, correct, explanation, points = next_block(trivia_file)

trivia_file.close()

print("That was the last question!")
print("Your final score is", score)

main()
input("\n\nPress the enter key to exit.")

Answer

points is a string, because you read this from the file:

points = next_line(the_file)

but score is an integer:

score = 0

You can't add a string to an integer. If the value you read from the file represents an integer number, you need to convert it first, using int():

score += int(points)