打印标题信息以提高Python的可读性

Question

I learned and code below which gives the Hostnames and Its IP address by the reading the hostname from the "mylabList.txt" file, Now i am looking the way to print the output in a pretty Human readable from Like Column header at the top of each and then the name (Below that)..

Is there way to set width between columns while printing...

#!/usr/bin/python

import sys
import socket
with open("mylabList.txt", 'r') as f:

  for host in f:
        print("{0[0]}\t{0[2][0]}".format(socket.gethostbyname_ex(host.rstrip())))

Current output is Like:

mylab1.example.com   172.10.1.1
mylab2.example.com   172.10.1.2
mylab3.example.com   172.10.1.3
mylab4.example.com   122.10.1.4

Expected Output is:

Server Name     IP ADDRESS
===================================
mylab1.example.com      172.10.1.1
mylab2.example.com      172.10.1.2
mylab3.example.com      172.10.1.3
mylab4.example.com      122.10.1.4

Just a note.. in my output Srever Name's lenghth is upto 30 Char long.

Answer 1

You could use ljust and rjust

http://www.tutorialspoint.com/python/string_ljust.htm http://www.tutorialspoint.com/python/string_rjust.htm

print("A String".ljust(30, " ") + "Another String")

results in

A String                      Another String

This is a possible way to do the trick:

#!/usr/bin/python

import sys
import socket
print("Server Name".ljust(30, " ") + "IP ADRESS")
print("="*39)
with open("mylabList.txt", 'r') as f:
    for host in f:
        print("{0[0]}\t{0[2][0]}".format(socket.gethostbyname_ex(host.rstrip())))