python 括号 中 不需要 反斜杠_在Python中引用不带换行符的长字符串

默认帮助格式化程序重新格式化字符串，以便您可以根据需要在帮助字符串中使用换行符：>>> from optparse import OptionParser

>>> parser = OptionParser()

>>> parser.add_option('--my-option', help='''aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa

aaaaaaaaaaaaaaaaaaaaaaa

... b

... c d

... e

... f''')

>>> parser.print_help()

Usage: bpython [options]

Options:

-h, --help show this help message and exit

--my-option=MY_OPTION

aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa

aaa b c d e f

要删除任何可以使用^{}的公共前导空格：>>> from optparse import OptionParser

>>> from textwrap import dedent

>>> parser = OptionParser()

>>> parser.add_option('--my-option', help=dedent('''\

... Here is a long description of my option. It does many things

... but I want the shell to decide how to display this

... explanation. However, I want newlines in this string.'''))

>>> parser.print_help()

Usage: [options]

Options:

-h, --help show this help message and exit

--my-option=MY_OPTION

Here is a long description of my option. It does many

things but I want the shell to decide how to display

this explanation. However, I want newlines in this

string.