2017.07.07 Python network programming print device name and IPV4 address

1. Easy to understand directly on the code:

#-*-coding=gb2312-*-
#! /usr/bin/env python
# Python Network Programming Cookbook--chapter-1
# This program was optimized for Python 2.7. It may run on any
# other Python version with/without modifications
#-*-coding=gb2312-*-
Import  Socket

Def print_machine_info ():
    Host_name=socket.gethostname ()
    Ip_address=socket.gethostbyname (HOST_NAME)

    Print "Host name is:%s"% host_name
    Print "IP address is:%s"% ip_address


If __name__== ' __main__ ':
    Print_machine_info ()

2. Obtain the IP address of the remote device:

#-*-Coding:utf-8-*-
#!/usr/bin/env/python

# Python Network Programming Cookbook--chapter-1
# Optimized for Python 2.7
# It may run on any other version with/without modifications

Import socket

Def get_remote_machine_info ():
    Remote_host = ' www.hqu.edu.cn '
    Try
        Print "Host IP address is:%s"%socket.gethostbyname (Remote_host)
    Except socket.error,err_msg:
        Print "%s:%s"% (remote_host,err_msg)

If __name__== ' __main__ ':
    Get_remote_machine_info ()

3. Convert the IPV4 address to a different format:

#-*-Coding:utf-8-*-
# If you want to use the underlying network function, sometimes the ordinary string format IP address is not very useful, we need to convert it to a packaged 32-bit binary format

#!/usr/bin/env Python
# Python Network Programming Cookbook--chapter-1
# Optimized for Python 2.7
# It may run on any other version with/without modifications

Import socket
From BINASCII import hexlify

Def convert_ipv4_address ():
    For ip_addr in [' 127.0.0.1 ', ' 192.168.0.1 ']:
        Packed_ip_addr =socket.inet_aton (IP_ADDR)
        UNPACKED_IP_ADDR = Socket.inet_ntoa (packed_ip_addr)

        Print "IP Address:%s = After Packaging:%s, before packaging:%s" \
            % (Ip_addr,hexlify (packed_ip_addr), unpacked_ip_addr)


If __name__== ' __main__ ':
    Convert_ipv4_address ()

4. Locate the service name via the specified port and protocol:

#-*-Coding:utf-8-*-
# If you want to find a network service, it's best to know which port the service is running on TCP or UDP protocol
#!usr/bin/env Python
# Python Network Programming Cookbook--chapter-1
# Optimized for Python 2.7
# It may run on any other version with/without modifications

Import socket
Def find_service_name ():
    ProtocolName = ' TCP '
    For port in [80,25]:
        Print "Port:%s + = Service Name is:%s  "% (Port,socket.getservbyport (port,protocolname)) \

    Print "Port:%s + = Service Name is:%s"% (53,socket.getservbyport (+, ' UDP '))

If __name__== ' __main__ ':
    Find_service_name ()

5. Convert between host byte order and network byte:

#-*-Coding:utf-8-*-
# when writing the underlying network application, it may be necessary to deal with the underlying data transmitted between the two devices via a cable, and the data emitted from the host operating system needs to be transformed into a network of various
#!usr/bin/env Python
# Python Network Programming Cookbook--chapter-1
# Optimized for Python 2.7
# It may run on any other version with/without modifications

Import socket

Def convert_integer ():
    data=1234
    print "source byte:%s = = Long host byte order:%s,network byte order:%s" \
            % (Data,socket.ntohl (data), SOCKET.HTONL (data))

    print "Source byte:%s" = Short host byte order:%s,network byte order:%s "\
            % (Data,socket.ntohs (data), socket.htons (data))

If __name__== ' __main__ ':
    Convert_integer ()

2017.07.07 Python network programming print device name and IPV4 address