将某些内容添加到字符串后，如何打印修改以及字符串的其余部分?

Question

所以标题可能没有意义。但这是代码：

def play_game(ml_string, blanks, selectedLevel):

replaced = []
ml_string = ml_string.split()
currentQuestion = 0

for blank in ml_string:
replacement = blank_in_quiz(blank, blanks,)
if replacement != None:
user_input = raw_input("Type in the answer for blank " + replacement + " ")
while user_input != allanswers[selectedLevel][currentQuestion]:
print "Incorrect!"
user_input = raw_input("Type in the answer for blank " + replacement + " ")
else:
blank = blank.replace(replacement, user_input)
replaced.append(blank)
print "nCorrect!n"
print " ".join(replaced + [currentQuestion,ml_string])
currentQuestion = currentQuestion + 1
else:
replaced.append(blank)
replaced = " ".join(replaced)
print replaced

本质上，它的作用是获取此字符串，该字符串ml_string：

"The movie __1__ is a war movie directed by __2__ Nolan about the __3__ and French armies stranded on the __4__ of Dunkirk while the __5__ army closed in on them."

一旦用户将正确答案添加到空白处，我就会尝试打印出填写在空白中的答案，以及带有他们尚未回答的空白的其余测验。

我是 python 的初学者，但我一直在为列表和索引值而苦苦挣扎。如果您想查看全文：https://repl.it/KTJh/16

55号线是我遇到的麻烦。感谢您的任何建议。

Answer 1

您可以使用字符串格式来创建带有占位符(replacement_field(的字符串，这些占位符填充了一些预定义的变量，当用户回答时，您只需更改变量即可。 格式规范允许命名占位符

s = "The movie {ans1} is a war movie directed by {ans2} Nolan about the {ans3} and French armies stranded on the {ans4} of Dunkirk while the {ans5} army closed in on them."

这样可以方便地用字典填写占位符

d = {'ans1' : '__1__', 'ans2' : '__2__',
'ans3' : '__3__', 'ans4' : '__4__',
'ans5' : '__5__'}

你像这样使用它：

>>> s.format(**d)
'The movie __1__ is a war movie directed by __2__ Nolan about the __3__ and French armies stranded on the __4__ of Dunkirk while the __5__ army closed in on them.'

像这样更改答案

>>> d['ans1'] = 'Ziegfield Follies'
>>> s.format(**d)
'The movie Ziegfield Follies is a war movie directed by __2__ Nolan about the __3__ and French armies stranded on the __4__ of Dunkirk while the __5__ army closed in on them.'
>>>

Answer 2

假设你正在使用最新的Python来学习(3.6(，你可以使用f-strings。 大括号中的项目可以是大多数 Python 表达式。 在这种情况下，它们索引一个单词列表：

import textwrap
def paragraph(words):
s = f'The movie {words[0]} is a war movie directed by {words[1]} Nolan about the {words[2]} and French armies stranded on the {words[3]} of Dunkirk while the {words[4]} army closed in on them.'
print()
print(textwrap.fill(s))
words = '__1__ __2__ __3__ __4__ __5__'.split()
paragraph(words)
words[0] = 'Dunkirk'
paragraph(words)

输出：

The movie __1__ is a war movie directed by __2__ Nolan about the __3__
and French armies stranded on the __4__ of Dunkirk while the __5__
army closed in on them.
The movie Dunkirk is a war movie directed by __2__ Nolan about the
__3__ and French armies stranded on the __4__ of Dunkirk while the
__5__ army closed in on them.