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？

所以标题可能没有意义。但这里是代码：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？

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

本质上讲这确实是拿这个字符串，这是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."

而且一旦用户将正确答案空白，我想打印将答案填在空白处，以及其余的测验中还有他们尚未回答的空白。

我是python的初学者，但我一直在努力处理列表和索引值。如果您想查看整体：https://repl.it/KTJh/16

55行是我遇到的麻烦。感谢您的任何建议。

来源

2017-08-27 louielouielouie

一个正则表达式可能会工作，但你有种做这是一个过于复杂的方式。我可能会单独存储完整的字符串，然后只在需要打印时才添加“下划线填充符”。我可以看到，比试图替换现有字符串的位更容易。 – Carcigenicate

@Carcigenicate这很有趣。我将尽力实现 – louielouielouie

这样，一旦用户获得了正确的答案，您可以用正确的答案替换填充程序。我想尽量详细说明，但我刚刚离开夜班，感到脑死亡。祝你好运。 – Carcigenicate

您可以使用string formatting创建与占位符（replacement_field）的字符串，用一些预定义的变量填充，因为用户只需更改变量即可。格式规范允许指定的占位符

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."

这使得它方便地在占位符填充字典

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

你使用这样的：

>>> 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.'

改变这样的答案

>>> 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.' 
>>>

来源

2017-08-27 04:19:28 wwii

哦，这也是一个很好的想法。可能比我的建议更Pythonic。 – Carcigenicate

这真的很有趣。我还没有学到甚至没有看到任何python字典的例子。它看起来比基本清单更有效率，就像我正在尝试的那样。谢谢你的回答 – louielouielouie

@Carcigenicate我在写这篇文章的时候阅读了你的评论，这些想法基本上是一样的，我差点给你提一提。 – wwii

假设你使用最新的Python来学习（3.6），你可以使用f-字符串。大括号中的项目可以是大多数Python表达式。在这种情况下，他们的索引单词列表：

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.

来源

2017-08-27 05:30:01

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？

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