In [1]: import toml
In [2]: foo = {'a': 'C:\\hostedtoolcache\\windows\\Python\\3.9.13\\x64\\Lib\\site-packages\\PyQt5\\bindings'}
In [3]: d = toml.dumps(foo)
In [4]: d
Out[4]: 'a = "C:\\hostedtoolcache\\windows\\Python\\3.9.13\\x64\\\\Lib\\\\site-packages\\\\PyQt5\\\\bindings"\n'
In [5]: toml.loads(d)
/usr/lib/python3/dist-packages/toml/decoder.py in loads(s, _dict, decoder)
    512                                         multibackslash)
    513             except ValueError as err:
--> 514                 raise TomlDecodeError(str(err), original, pos)
    515             if ret is not None:
    516                 multikey, multilinestr, multibackslash = ret

TomlDecodeError: Reserved escape sequence used (line 1 column 1 char 0)