python 折行的正确姿势

• 2020 年 1 月 9 日
• 筆記

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？

方案1

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。

方案2

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

方案3

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