Python study notes 9-file read/write,

Python study notes 9-file read/write,

1. Read files:

F = open ('directory', 'read/Write mode', encoding = 'gbk, error = 'egiong '). The last three items can be left blank, but the default value is 'R; the read () method is automatically added to the file object opened by the open function;

F. read () read the file you just opened. Remember to close () the function at last; otherwise, unpredictable consequences may occur.

Read/write mode: r read-only, r + read/write, w new (will overwrite the original file), a append, B binary file. Common Mode. For example, 'rb', 'wb ', 'r + B', etc.

The readline () function reads multiple files in turn and returns the list by row. An iteration is used for reading,Print (line. strip ()#Remove/n from each line

With open('nihaoa.txt ') as f: facilitates the way to throw exceptions in try finally.

For I in f. readlines ():

Print (I. strip ())

2. Write files:

Open the file first, and then use the write method. To prevent the use of

With open('nihaoa.txt ', 'w') as f:

F. write ('woshidahaoren ')

Note that the write method will directly overwrite the original file content;