Python network programming: socket, gethostname, gethostbyname

Python network programming: socket, gethostname, gethostbyname

Function: print the Host Name and Host IP Address:

 

[root@iZ94gh8l046Z python]# cat socket1.py #!/usr/bin/pythonimport sockethost_name = socket.gethostname()print hostname:%s % host_nameprint IP address: %s %socket.gethostbyname(host_name)

Running result:

 

[Root @ iZ94gh8l046Z python] #./socket1.py
Hostname: iZ94gh8l046Z
IP address: 10.170.16.67

Module:

Import socket

Usage:

Socket. gethostname get hostname (/etc/hostname)

Socket. gethostbyname

After improvement:

 

[root@iZ94gh8l046Z python]# cat socket2.py #!/usr/bin/pythonimport socketdef print_machine_info():    host_name = socket.gethostname()    ip_address = socket.gethostbyname(host_name)    print hostname:%s % host_name    print IP address: %s %ip_addressif __name__ == '__main__':    print_machine_info()

 

Running result:

[Root @ iZ94gh8l046Z python] #./socket2.py
Hostname: iZ94gh8l046Z
IP address: 10.170.16.67

Description: We need to call this function in the commonly used _ main _ code block.

During runtime, Python assigns values to some internal variables, such as _ name __. Here, __name _ indicates the name of the process that calls the program.

If you run the script in the command, the value of __name _ is _ main __

However, if you import data in other scripts, the situation is different.

That is to say, if this module is called in the command line, the print_machine_info () function is automatically run.

If you import data in other scripts, you must manually call this function.