Create and append object content instances using Python

This article mainly introduces Python file creation and append file content instances. This article also provides the standard output to the file instance. For more information, see 1. create a new file in Python with an integer ranging from 0 to 9. each number occupies one row:

The code is as follows:

# Python
>>> F=open('f.txt ', 'w') # r read-only, w writable, a Appended
>>> For I in range (0, 10): f. write (str (I) + '\ n ')
...
>>> F. close ()

2. append the file content, with 10 random integers from 0 to 9:

The code is as follows:

# Python
>>> Import random
>>> F=open('f.txt ', 'A ')
>>> For I in range (0, 10): f. write (str (random. randint (0, 9 )))
...
>>> F. write ('\ n ')
>>> F. close ()

3. append the file content, a random integer from 0 to 9, a row of 10 numbers, 10 rows in total:

The code is as follows:

# Python
>>> Import random
>>> F=open('f.txt ', 'A ')
>>> For I in range (0, 10 ):
... For I in range (): f. write (str (random. randint )))
... F. write ('\ n ')
...
>>> F. close ()

4. export standard output to a file:

The code is as follows:

# Python
>>> Import sys
>>> Sys. stdout = open ("stdout.txt", "w ")

Example:
22nd client profile, and write the final result into a.txt

The code is as follows:

#! /Usr/bin/python
# Coding = UTF-8
Import OS
Import time
Import sys
F=open('a.txt ', 'A ')
F. write (OS. popen ('netstat-nltp | grep 22 '). read ())
F. close ()