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Why can’t raw strings (r-strings) end with a backslash in Python?
The r in r-strings means raw strings. String literals may optionally be prefixed with a letter 'r' or 'R'; such strings are called raw strings and use different rules for interpreting backslash escape sequences.
When an 'r' or 'R' prefix is present, a character following a backslash is included in the string without change, and all backslashes are left in the string. For example, the string literal r"\n" consists of two characters −
- a backslash and
- a lowercase 'n'.
String quotes can be escaped with a backslash, but the backslash remains in the string; for example, r""" is a valid string literal consisting of two characters −
- a backslash and
- a double quote;
The r"" is not a valid string literal. Specifically, a raw string cannot end in a single backslash. A single backslash followed by a newline is interpreted as those two characters as part of the string, not as a line continuation.
For Windows pathnames, the Windows system calls accept forward slashes too −
f = open("/mydir/demo.txt")
Pathname for a DOS command −
dir = r"\this\is\my\dos\dir" "" dir = r"\this\is\my\dos\dir\ "[:-1] dir = "\this\is\my\dos\dir"
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