在每个lin的开头添加一些字符

Question

我想在每行的开头加上一些字符。

我该怎么办？

我是这么做的：

'\n\t\t\t'.join(myStr.splitlines())

但这并不完美，我想知道是否有更好的方法来做到这一点。我本来想自动缩进一整块文本。

Answer 1

对于灵活的选项，您可能希望查看标准库中的textwrap。

示例：

>>> hamlet='''\
... To be, or not to be: that is the question:
... Whether 'tis nobler in the mind to suffer
... The slings and arrows of outrageous fortune,
... Or to take arms against a sea of troubles,
... And by opposing end them? To die: to sleep;
... No more; and by a sleep to say we end
... '''
>>> import textwrap
>>> wrapper=textwrap.TextWrapper(initial_indent='\t', subsequent_indent='\t'*2)
>>> print wrapper.fill(hamlet)
    To be, or not to be: that is the question: Whether 'tis nobler in the
        mind to suffer The slings and arrows of outrageous fortune, Or to
        take arms against a sea of troubles, And by opposing end them? To
        die: to sleep; No more; and by a sleep to say we end

您可以看到，您不仅可以轻松地在每一行的前面添加灵活的空间，还可以对每一行进行裁剪以适应、断字、展开制表符等

它将换行（因此命名）因为前面的添加而变得太长：

>>> wrapper=textwrap.TextWrapper(initial_indent='\t'*3, 
... subsequent_indent='\t'*4, width=40)
>>> print wrapper.fill(hamlet)
            To be, or not to be: that is the
                question: Whether 'tis nobler in the
                mind to suffer The slings and arrows
                of outrageous fortune, Or to take
                arms against a sea of troubles, And
                by opposing end them? To die: to
                sleep; No more; and by a sleep to
                say we end

非常灵活和有用。

编辑

如果你想用文本换行来保持文本中行结束的含义，只需把文本换行和拆分行结合起来，以保持行结束相同。

悬挂缩进示例：

import textwrap

hamlet='''\
Hamlet: In the secret parts of Fortune? O, most true! She is a strumpet. What's the news?
Rosencrantz: None, my lord, but that the world's grown honest.
Hamlet: Then is doomsday near.'''

wrapper=textwrap.TextWrapper(initial_indent='\t'*1, 
                             subsequent_indent='\t'*3, 
                             width=30)

for para in hamlet.splitlines():
    print wrapper.fill(para)
    print 

印刷品

Hamlet: In the secret parts
        of Fortune? O, most true!
        She is a strumpet. What's
        the news?

Rosencrantz: None, my lord,
        but that the world's grown
        honest.

Hamlet: Then is doomsday
        near.