Slashes in Python

First of all, "/" slanted to the left is a forward slash, "\" slanted to the right is a backslash, which can be recorded as: The division sign is a forward slash. Generally speaking, for directory separators, Unix and Web use forward slash /. Windows uses backslashes, but now Windows

(1) Slashes in the directory

The directory parameters that Python needs to enter to read files are listed below:

path = r"C:\Windows\temp\readme.txt"

path1 = r"c:\windows\temp\readme.txt"

path2 = "c:\\windows\\temp\\readme.txt"

path3 = "c:/windows/temp/readme.txt"

The parameters in the open file function open() can be path or path1, path2, or path3.

path: "\" is a special character in the string. After adding r, it becomes the original string. Then "\t" and "\r" in the string will not be processed. String escaping

#path1: Case does not affect the location of files in Windows

path2: Use one "\" to cancel the special escaping of the second "\" The function is "\\"

path3: You can also go to the corresponding directory by using a forward slash as the directory separator, and the path3 method in python also omits the backslash\ conversion. The troubles of meaning

(2) Slashes in regular expressions

Regular expressions match backslash "\", why is "\\\\ "or r"\\"?

Because \ is a special symbol in regular expressions, in order to cancel its special meaning in regular expressions, you need to add a \ and it becomes \\, but the problem comes again, \ is also Special characters in the string, so the special meaning of the two \ must be canceled respectively, which is \\\\. There is a raw string operator in Python, which is used for those special characters that appear in the string. In the raw string, there are no escape characters and unprintable characters. This will cancel the escaping function of \ in the string, that is, r"\\".

The above is the left slash and right slash (forward slash and backslash) in Python introduced by the editor. I hope it will be helpful to you. If you have any questions If you have any questions, please leave me a message and I will reply to you in time. I would also like to thank you all for your support of the PHP Chinese website!

#For more articles related to slashes in Python, please pay attention to the PHP Chinese website!