Python-сообщество

Всем доброго времени суток!
Имеется вот такой код:
# 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

explanation = next_line(the_file)

return category, question, answers, correct, explanation

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 = next_block(trivia_file)
while category:
# ask a question
print(category)
print(question)
for i in range(4):
print(“\t”, i + 1, “-”, answers)

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

# check answer
if answer == correct:
print(“\nRight!”, end=“ ”)
score += 1
else:
print(“\nWrong.”, end=“ ”)
print(explanation)
print(“Score:”, score, “\n\n”)

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

trivia_file.close()

print(“That was the last question!”)
print(“You're final score is”, score)

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


и данные, которые берет из текстового файла.
Мне не понятна вот эта строка кода:
correct = next_line(the_file)
if correct:
correct = correct
Ведь correct эта переменная, а не список?

Прикреплённый файлы:
trivia.txt (1,5 KБ)

bravestar
Мне не понятна вот эта строка кода:
correct = next_line(the_file)
if correct:
correct = correct
Ведь correct эта переменная, а не список?

[code python][/code]

PEHDOM
А вот следующая строка “correct = correct” абсолютно бессмыслена, если конечно там нету квадратных скобок котоые сьел движок сайта.

     if correct:
        correct = correct[0]

 def next_line(the_file):
    '''Return next line from the trivia file, formatted.'''
    line = the_file.readline().strip('\n')    #убрать переводы строк
    line = line.replace('/', '\n')
    return line

Извиняюсь, впервые задавал вопрос на сайте. Да движок съел квадратные скобки
В оригинале, код выглядит вот так:

 # 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) 
    return category, question, answers, correct, explanation
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 = 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 += 1
        else:
            print("\nWrong.", end=" ")
        print(explanation)
        print("Score:", score, "\n\n")
        # get next block
        category, question, answers, correct, explanation = next_block(trivia_file)
    trivia_file.close()
    print("That was the last question!")
    print("You're final score is", score)
 
main()  
input("\n\nPress the enter key to exit.")

rami

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

bravestar
Если correct непустая строка:
переменной correct присваивается первый элемент списка correct.
Откуда взялся список correct и зачем его присваивать значению переменной correct?

     if correct:
        correct = correct[0]

 correct = correct.strip('\n')

bravestar
Откуда взялся список correct и зачем его присваивать значению переменной correct?

 >>> st = 'python'
>>> st[0]
'p'
>>> st[0:3]
'pyt'
>>> st[-1]
'n'
>>> st[0::2]
'pto'
>>> st[:]
'python'
>>>

[code python][/code]

Отредактировано PEHDOM (Июнь 12, 2018 09:46:08)

rami
correct не список, а строка (состоящая из символов).
Если correct не пустая строка, то она содержит два элемента — цифру правильного ответа и перевод строки, нам нужен первый элемент, а не оба.