Issue
Why is pep8 complaining on the next string in the code?
import re
re.compile("\d{3}")
The warning I receive:
ID:W1401 Anomalous backslash in string: '\d'. String constant might be missing an r prefix.
Can you explain what is the meaning of the message? What do I need to change in the code so that the warning W1401 is passed?
The code passes the tests and runs as expected. Moreover \d{3}
is a valid regex.
Solution
"\d"
is same as "\\d"
because there's no escape sequence for d
. But it is not clear for the reader of the code.
But, consider \t
. "\t"
represent tab chracter, while r"\t"
represent literal \
and t
character.
So use raw string when you mean literal \
and d
:
re.compile(r"\d{3}")
or escape backslash explicitly:
re.compile("\\d{3}")
Answered By - falsetru
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