Learning immediately: https://edu.csdn.net/course/play/26755/340106?utm_source=blogtoedu
There are three magical python read: read, readline and readlines
read (): one-time read the entire contents of the file. Recommended read (size), and the longer running time of greater size
readline (): read every single line. Not enough memory use, generally do not use
readlines (): one-time read the entire contents of the file, and press OK to return to the list, to help us traverse
We are generally small files using read (), you're sure about the size of a given size, large file to use readlines ()
readlines reading the configuration file still has some advantages
