Stupid way to learn Python learning notes

Created on: 2016-02-29

Update: 02-29

Python version: 2.7

1. %r is good for debugging because it shows the raw data of the variable, while the other symbols are used to show the output to the user;
2. Print will not output line breaks If you add one after each line of print (comma).
3. argv command-line arguments are strings, so it is necessary to convert int () to a number when the number is involved, raw_input () is also a string.
4. Common ways to read and write files: close,read,readline,truncate,write
5. There is an attribute exists in Os.path. Can be used to determine if a file exists, and the return value is bool
6. *args: All parameters of the function are received and placed in the list named args.
7. The ReadLine () function prints the \ n in the original text.
8. The Seek (0) function handles bytes rather than rows, so seek (0) goes to the beginning of the file.
   

Stupid way to learn Python learning notes