正如PEP8所建议的那样，在python程序中保持低于80列的规则，对于长字符串，我怎么能遵守这个规则呢?
s = "this is my really, really, really, really, really, really, really long string that I'd like to shorten."
我该如何把它扩展到下面一行呢?
s = "this is my really, really, really, really, really, really" +
"really long string that I'd like to shorten."
当前回答
我以前用过textwrap.dedent。这有点麻烦，所以我现在更喜欢行延续，但如果你真的想要块缩进，我认为这很好。
示例代码(其中trim是去掉带有切片的第一个'\n'):
import textwrap as tw
x = """\
This is a yet another test.
This is only a test"""
print(tw.dedent(x))
解释:
Dedent根据新行前第一行文本中的空白计算缩进。如果你想调整它，你可以使用re模块轻松地重新实现它。
这种方法有局限性，很长的行可能仍然比你想要的长，在这种情况下，其他方法连接字符串更适合。
其他回答
message = f"Variable : child({type(child)}) -> is not of"\
" type Node."
这个语法适合我。注意第二个语句的缩进，它应该缩进正确。
我觉得你问题中最重要的一个词是“suggest”。
编码标准是很有趣的东西。通常他们提供的指导在编写时有很好的基础(例如，大多数终端无法在一行上显示> 80个字符)，但随着时间的推移，它们在功能上变得过时了，但仍然被严格遵守。我猜您在这里需要做的是权衡“破坏”特定建议与代码的可读性和可维护性之间的相对优点。
抱歉，这并不能直接回答你的问题。
您丢失了一个空格，您可能需要一个行延续字符，即。一个\。
s = "this is my really, really, really, really, really, really" + \
" really long string that I'd like to shorten."
甚至:
s = "this is my really, really, really, really, really, really" \
" really long string that I'd like to shorten."
parns也可以代替行续符，但可能会有人认为您打算使用元组，而只是忘记了逗号。举个例子:
s = ("this is my really, really, really, really, really, really"
" really long string that I'd like to shorten.")
对比:
s = ("this is my really, really, really, really, really, really",
" really long string that I'd like to shorten.")
使用Python的动态类型，代码可以以任何一种方式运行，但会产生不正确的结果。
如果你必须插入一个长字符串文字，并希望flake8关闭，你可以使用它的关闭指令。例如，在一个测试例程中，我定义了一些假的CSV输入。我发现把它分成更多行会非常混乱，所以我决定添加一个# noqa: E501，如下所示:
csv_test_content = """"STATION","DATE","SOURCE","LATITUDE","LONGITUDE","ELEVATION","NAME","REPORT_TYPE","CALL_SIGN","QUALITY_CONTROL","WND","CIG","VIS","TMP","DEW","SLP","AA1","AA2","AY1","AY2","GF1","MW1","REM"
"94733099999","2019-01-03T22:00:00","4","-32.5833333","151.1666666","45.0","SINGLETON STP, AS","FM-12","99999","V020","050,1,N,0010,1","22000,1,9,N","025000,1,9,9","+0260,1","+0210,1","99999,9","24,0000,9,1",,"0,1,02,1","0,1,02,1","01,99,1,99,9,99,9,99999,9,99,9,99,9","01,1","SYN05294733 11/75 10502 10260 20210 60004 70100 333 70000="
"94733099999","2019-01-04T04:00:00","4","-32.5833333","151.1666666","45.0","SINGLETON STP, AS","FM-12","99999","V020","090,1,N,0021,1","22000,1,9,N","025000,1,9,9","+0378,1","+0172,1","99999,9","06,0000,9,1",,"0,1,02,1","0,1,02,1","03,99,1,99,9,99,9,99999,9,99,9,99,9","03,1","SYN04294733 11/75 30904 10378 20172 60001 70300="
"94733099999","2019-01-04T22:00:00","4","-32.5833333","151.1666666","45.0","SINGLETON STP, AS","FM-12","99999","V020","290,1,N,0057,1","99999,9,9,N","020000,1,9,9","+0339,1","+0201,1","99999,9","24,0000,9,1",,"0,1,02,1","0,1,02,1",,"02,1","SYN05294733 11970 02911 10339 20201 60004 70200 333 70000="
"94733099999","2019-01-05T22:00:00","4","-32.5833333","151.1666666","45.0","SINGLETON STP, AS","FM-12","99999","V020","200,1,N,0026,1","99999,9,9,N","000100,1,9,9","+0209,1","+0193,1","99999,9","24,0004,3,1",,"1,1,02,1","1,1,02,1","08,99,1,99,9,99,9,99999,9,99,9,99,9","51,1","SYN05294733 11/01 82005 10209 20193 69944 75111 333 70004="
"94733099999","2019-01-08T04:00:00","4","-32.5833333","151.1666666","45.0","SINGLETON STP, AS","FM-12","99999","V020","070,1,N,0026,1","22000,1,9,N","025000,1,9,9","+0344,1","+0213,1","99999,9","06,0000,9,1",,"2,1,02,1","2,1,02,1","04,99,1,99,9,99,9,99999,9,99,9,99,9","02,1","SYN04294733 11/75 40705 10344 20213 60001 70222="
""" # noqa: E501
使用黑色[https://github.com/psf/black]，我像这样格式化它。
help=f"""filters, lista de filtros para cargar las base de conocimiento.
Pueden mandarse solo algunos filtros ya que no son obligatorios,
por ejemplo, si no se manda sts, se cargarán todos las bases de todos los estados.""",
