多行返回语句 [英] Return statement on multiple lines

问题描述

已经搜索了互联网试图解决这个问题，但没有运气.据我所知，您通常只有一个 return 语句，但是我的问题是我的 return 语句中需要换行，以便测试返回true".我试过的是抛出错误，可能只是一个新手错误.我当前没有尝试换行的功能如下.

Have scoured the interwebs trying to figure this out but with no luck. As far as I know you usually only have one return statement however my problem is that I need to have line breaks in my return statement in order for the testing to return 'true'. What I've tried is throwing up errors, probably just a rookie mistake. My current function with no attempts to make a line break is below.

def game(word, con):
   return (word + str('!')
   word + str(',') + word + str(phrase1)

换行符 (\n) 是否应该在 return 语句中起作用?这不在我的测试中.

Are new line breaks (\n) supposed to work in return statements? It's not in my testing.

推荐答案

在 Python 中，打开括号会导致后续行被视为同一行的一部分，直到关闭括号.

In python, an open paren causes subsequent lines to be considered a part of the same line until a close paren.

所以你可以这样做:

def game(word, con):
    return (word + str('!') +
            word + str(',') +
            word + str(phrase1))

但在这种特殊情况下，我不建议这样做.我提到它是因为它在语法上是有效的，你可以在其他地方使用它.

But I wouldn't recommend that in this particular case. I mention it since it's syntactically valid and you might use it elsewhere.

您可以做的另一件事是使用反斜杠:

Another thing you can do is use the backslash:

def game(word, con):
    return word + '!' + \
           word + ',' + \
           word + str(phrase)
    # Removed the redundant str('!'), since '!' is a string literal we don't need to convert it

或者，在这种特殊情况下，我的建议是使用格式化的字符串.

Or, in this particular case, my advice would be to use a formatted string.

def game(word, con):
    return "{word}!{word},{word}{phrase1}".format(
        word=word, phrase1=phrase1")

这看起来在功能上等同于你在你身上做的事情，但我真的不知道.不过，在这种情况下，我会选择后者.

That looks like it's functionally equivalent to what you're doing in yours but I can't really know. The latter is what I'd do in this case though.

如果您想在 STRING 中换行，那么您可以在任何需要的地方使用\n"作为字符串文字.

If you want a line break in the STRING, then you can use "\n" as a string literal wherever you need it.

def break_line():
    return "line\nbreak"

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