python 折行的正确姿势

py3study

发布于 2020-01-09 14:26:18

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文章被收录于专栏：python3python3

在写 python 代码时，有时变量值是一个非常长的字符串，比如这样：

line = 'this is a very very very very very very very very very very long string'

如果写在一行里，难看不说，可能还过不了一些代码风格检测。

那么应该怎么折行呢？

line = """
this is a very very very very
very very very very very very
very very very very very very
long string
"""

但是这个方案有个弊端，本来是一行字符串，结果变成了多行，而且如果有缩进的话，本来表示缩进的空格，也作为字符串的一部分了。跟我们实际想要的并不一致。

line = 'this is a\
very very very
long string 
'

此方案解决了方案1里多余的换行符的问题，字符串真的是一行了。但是同样没解决缩进导致的多余的空格的问题

line = (
    "this is a"
    "very very very very"
    "long string"
)

此方案完美地解决了长字符串折行/换行的问题。另外强调一下，如果有格式化字符串需求的话，应该这么写：

a = "test_str"
b = 123
line = (
    "i have a string %s"
    "and a number %d"
) % (a, b)

妈妈再也不用担心我的一行代码太长了

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原始发表：2019/08/26 ，如有侵权请联系 cloudcommunity@tencent.com 删除