Print file content to output - Python

Required: Write a python program to print the content of a file to output (same as Linux/UNIX cat command do)

Way1: Using file.read file object in python

import sys,os.path

if len(sys.argv) < 2:
   print 'No file specified'
   sys.exit()
else:
   try:
      f = open(sys.argv[1], 'r')
      print f.read(),
      f.close()
   except IOError:
      print "File" + sys.argv[1] + "does not exist."

Execute it this way: To print the contents of file.txt to the output.

$ python cat-read.py file.txt

Way2: Another similar python program using file.readline

import sys

def readfile(fname):
   f = file(fname)
   while True:
      line = f.readline()
      if len(line) == 0:
         break
      print line.strip() #Avoid strip: print line,
   f.close()

if len(sys.argv) < 2:
   print 'No file specified'
   sys.exit()
else:
   readfile(sys.argv[1])

Read about python file()
In python 3.0 file() is removed.

Related concepts:

• Python file object file.close()
• Python File Objects described here