Python file input and output

The python file object can access not only normal disk files, but also file objects (such as URL addresses) at the abstraction level

Opening file open () files () function can be arbitrarily substituted

fp = open ('/etc/test.txt','R')#Open as read-onlyfp = open ('Test.txt','W')#Open in write modefp = open ('Data.txt','r+')#Open in Read and write modeFP = open (r'C:\io.sys','RB')#Open in binary read-only mode

Input:

Tp.read (size)        # reads a size byte from a file tp.readline ()        # reads one line at a time tp.readlines ()        # Read all rows of the file

Output:

Fp.write ('test test')

Moving within files

Seek ( -12,1)        # move forward 12 characters in the current position #-12 minus means move forward  1 means the current position 0 means the file starts 2 means end of file # use tell () to return the position in the current file before use

#例子
f = open ('Test.txt','w+')PrintF.tell () f.write ('Text line 1\n')PrintF.tell () f.write ('Test Line 2\n')PrintF.tell () F.seek (-13,1)PrintF.tell () f.write ('Test Line 3\n')PrintF.tell () F.seek (-13,1)PrintF.tell ()

After you have finished working on the file, be sure to close the file Fp.close ()

　　　　

Python file input and output