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Python Application 4 - Replace Text Content

Step 1

Open any text editor (gedit,pico,vi,nano) then enter the following python script and save the file with .py extension.

#!/usr/bin/python

#Author : Jijo K Jose

print "\n------------------------------------\nChapter 22 - Regular Expression 5 \n------------------------------------\n"

import re

in_str = raw_input("Enter a text         : ")

se_str = raw_input("Enter search string  : ")

re_str = raw_input("Enter replace string : ")

count = 10

reg1 = re.compile(se_str)

print "Result : ",reg1.sub(re_str,in_str,count)

print "\n-----------------------------------\n"

#END

Python Application 3 - Check Email Address

Step 1

Open any text editor (gedit,pico,vi,nano) then enter the following python script and save the file with .py extension.

#!/usr/bin/python

#Author : Jijo K Jose

print "\n------------------------------------\nChapter 20 - Regular Expression 4 \n------------------------------------\n"

import re
in_str = raw_input("Enter an email address : ")
se_str = "\w+@\w+\.[com|in|org|net]"
reg1 = re.compile(se_str)
search1 = reg1.search(in_str)

if search1:

 print "\nValid email address"
else:
 print "\nInvalid email address"

print "\n-----------------------------------\n"
#END

Python Application 2 - Extract File Content

Step 1

Open any text editor (gedit,pico,vi,nano) then enter the following python script and save the file with .py extension.

#!/usr/bin/python

#Author : Jijo K Jose

f1 = open("logfile","r")

for i in f1.readlines():

 j = i.split(' ')

 print j

#END

Python Application 1 - Format File Content

Step 1

Open any text editor (gedit,pico,vi,nano) then enter the following python script and save the file with .py extension.

#!/usr/bin/python

#Author : Jijo K Jose
input_file = raw_input("\nEnter input file name : ")
output_file = "file_new.txt"
h1 = open(input_file,"r")
print "\n----------------------------"
print "Input File Content"
print "----------------------------\n"
for i in h1:
 print i,

h1.close()
h1 = open(input_file,"r")
h2 = open(output_file,"w")
k=0
for i in h1:
 i2 = i.split(',')
 for j in i2:
  n = len(j)
  if j[n-1] =="\n":
   h2.write(j)
 else:
  h2.write(j)

  h2.write("\n")

h1.close()

h2.close()

print "\n---------------------------"

print "Output File Content - file_new.txt"
print"----------------------------\n"
h1 = open(output_file,"r")
for i in h1:
 print i,
print "\n---------------------------\n"
#END

Chapter 22 – Python Regular Expression Part 5

Step 1

Open any text editor (gedit,pico,vi,nano) then enter the following python script and save the file with .py extension.

#!/usr/bin/python

#Author : Jijo K Jose

print "\n------------------------------------\nChapter 22 - Regular Expression 5 \n------------------------------------\n"
import re
in_str = raw_input("Enter a text         : ")
se_str = raw_input("Enter search string  : ")
re_str = raw_input("Enter replace string : ")
count = 2
reg1 = re.compile(se_str)
print "Result : ",reg1.sub(re_str,in_str,count)

print "\n-----------------------------------\n"

#END

Chapter 21 – Python Regular Expression Part 4

Step 1

Open any text editor (gedit,pico,vi,nano) then enter the following python script and save the file with .py extension.

#!/usr/bin/python

#Author : Jijo K Jose
print "\n------------------------------------\nChapter 21 - Regular Expression 4 \n------------------------------------\n"
import re
in_str = raw_input("Enter an email address : ")
se_str = "\w+@\w+\.[com|in|org|net]"
reg1 = re.compile(se_str)

search1 = reg1.search(in_str)

if search1:
 print "\nValid email address"
else:
 print "\nInvalid email address"
print "\n-----------------------------------\n"

#END

Chapter 20 – Python Regular Expression Part 3

 

Step 1

 

Open any text editor (gedit,pico,vi,nano) then enter the following python script and save the file with .py extension.

 

#!/usr/bin/python

#Author : Jijo K Jose

 

print "\n------------------------------------\nChapter 20 - Regular Expression 3 \n------------------------------------\n"

 

import re

 

in_str = raw_input("Enter the text : ")

 

se_str = raw_input("Enter search string : ")

 

reg1 = re.compile(se_str)

 

find1 = reg1.findall(in_str)

 

print "\nOutput of - .findall() : ", find1 

 

print "\n-----------------------------------\n"

 

iter1 = reg1.finditer(in_str)

 

print "Output of - .finditer() : \n"

 

for i in iter1:

 print i.group() 

 

print "\n-----------------------------------\n"

 

#END

Chapter 19 – Python Regular Expression Part 2

 

Step 1

 

Open any text editor (gedit,pico,vi,nano) then enter the following python script and save the file with .py extension.

 

#!/usr/bin/python

#Author : Jijo K Jose

 

print "\n------------------------------------\nChapter 19 - Regular Expression 2 \n------------------------------------\n"

 

import re

match_str = "jijo k 50 JOSE"

search_str = "[a-z]+.*"

 

print "Input String : %s"%match_str

 

print "\n-----------------------------------\n"

 

reg1 = re.compile(search_str,re.IGNORECASE)

match = reg1.match(match_str)

 

print "Address Location : ",reg1.match(search_str)

print "Search string : ",search_str

print "Matched string : ",match.group()

 

print "\n-----------------------------------\n"

 

search_str = '[a-z]+\s[a-z]\s[0-9]+\s\w[A-Z]'

reg1 = re.compile(search_str)

match = reg1.match(match_str)

 

print "Search string : ",search_str

print "Matched string : ",match.group()

 

print "\n-----------------------------------\n"

 

#END

Chapter 18 - Python Regular Expression Part 1

 

Step 1

 

Open any text editor (gedit,pico,vi,nano) then enter the following python script and save the file with .py extension.

 

#!/usr/bin/python

#Author : Jijo K Jose

 

print "\n------------------------------------\nChapter 18 - Regular Expression 1 \n------------------------------------\n"

 

import re

match_str = raw_input("Enter a text : ")

search_str = raw_input("Enter search string : ")

 

reg1 = re.compile(search_str,re.IGNORECASE)

 

print "Address Location : ",reg1.match(match_str)

 

print "\n-----------------------------------\n"

 

match = reg1.match(match_str)

 

if match:

 print "Match - Found : ",match.group()

else:

 print "No match found !!! "

 

print "\n-----------------------------------\n"

 

search = reg1.search(match_str)

 

if search:

 print "Search Found : ",search.group()

else:

 print "No searched result !!!"

 

print "\n-----------------------------------\n"

 

#END

Chapter 17 - Python High Level File I/O Operations

 

Step 1

 

Open any text editor (gedit,pico,vi,nano) then enter the following python script and save the file with .py extension.

 

#!/usr/bin/python

#Author : Jijo K Jose

 

import shutil

 

print "\n------------------------------------\nChapter 17 - High level File I/O \n------------------------------------\n"

 

s = shutil

 

s.copy("data1","data5")

 

print "File data1 copied to data5 -shutil.copy() \n"

 

s.copy2("data1","data6")

 

print "File data1 copied to data6 without changing timestamp -shutil.copy1() \n"

 

s.move("data5","temp/data7")

 

print "File data5 moved to temp/data5 -shutil.move() \n" 

 

srcdir = "temp"

desdir = "temp2"

 

s.rmtree(desdir)

 

print "Remove the whole directory tree -shutil.rmtree() \n"

 

s.copytree(srcdir,desdir)

 

print "Copy the whole directory tree -shutil.copytree() \n"

 

print "\n----------------------------------------"

 

#END

Chapter 16 - Python Functions

 

Step 1

 

Open any text editor (gedit,pico,vi,nano) then enter the following python script and save the file with .py extension.

 

#!/usr/bin/python

#Author : Jijo K Jose

 

print "\n------------------------------------\nChapter 16 - Functions \n------------------------------------\n"

 

def sum_mul(a,b):

 return a+b,a*b

 

c,d = sum_mul(10,20)

 

print "Sum = %d and Product = %d" %(c,d) 

 

print"----------------------------------------"

 

#END

Chapter 15 - Python Exceptions

 

Step 1

 

Open any text editor (gedit,pico,vi,nano) then enter the following python script and save the file with .py extension.

 

#!/usr/bin/python

#Author : Jijo K Jose

 

print "\n------------------------------------\nChapter 15 - File Writing \n------------------------------------\n"

 

while 1:

 f1=raw_input("Enter the file name : ")

 try:

  h1 = open(f1,"r")

  print "\nFile contents are :\n",h1.read()

  break 

 except:

  print "Problem in opening file : ",f1

 

print"----------------------------------------"

 

#END

Chapter 14 – Python File Write Operations

 

Step 1

 

Open any text editor (gedit,pico,vi,nano) then enter the following python script and save the file with .py extension.

 

#!/usr/bin/python

#Author : Jijo K Jose

 

print "\n------------------------------------\nChapter 14 - File Writing \n------------------------------------\n"

 

h1 = open("data1","r")

h2 = open("data2","w")

h3 = open("data3","w")

print h1

 

h1 = open("data1","r")

s = h1.readlines()

print "\nReading the Content - readlines() : ",s

 

for i in s:

 h2.write(i)

 

print "File contents are written to data2 using write()"

 

h3.writelines(s)

print "File contents are written to data3 using writelines()"

 

print "\n--------------------------------------\n"

 

h1.close()

h2.close()

 

#END

Chapter 13 - Python File Read Operations

 

Step 1

 

Open any text editor (gedit,pico,vi,nano) then enter the following python script and save the file with .py extension.

 

#!/usr/bin/python

#Author : Jijo K Jose

 

print "\n------------------------------------\nChapter 13 - File Reading \n------------------------------------\n"

 

h1 = open("data1","r")

print h1

 

print "\nReading the first line -readline() : ",h1.readline()

 

h1 = open("data1","r")

print "\nReading the full content - read() : \n",h1.read()

 

h1 = open("data1","r")

print "\nReading the First 25 Character - read(25) : ",h1.read(25)

 

h1 = open("data1","r")

print "\nReading the Content - readlines() : ",h1.readlines()

 

print "\n--------------------------------------\n"

 

#END

Chapter 12 - Python While Loop

 

Step 1

 

Open any text editor (gedit,pico,vi,nano) then enter the following python script and save the file with .py extension.

 

#!/usr/bin/python

#Author : Jijo K Jose

 

print "\n------------------------------------\nChapter 12 - While Loop \n------------------------------------\n"

 

c=1

while(c!=0):

 i = input("Enter an integer : ")

 while(i > 0):

  print i

  i -= 1

 c = input("To quit press 0 : ")

 

print "\n--------------------------------------\n"

 

#END

Chapter 11 - Python For Loop

 

Step 1

 

Open any text editor (gedit,pico,vi,nano) then enter the following python script and save the file with .py extension.

 

#!/usr/bin/python

#Author : Jijo K Jose

 

print "\n------------------------------------\nChapter 11 - For Loop \n------------------------------------\n"

 

for i in range(10,25,2):

  print i

 

print "\n--------------------------------------\n"

 

#END

Chapter 10 - Python Command Line Arguments

 

Step 1

 

Open any text editor (gedit,pico,vi,nano) then enter the following python script and save the file with .py extension.

 

#!/usr/bin/python

#Author : Jijo K Jose

 

print "\n------------------------------------\nChapter 10 - Command Line Parameters \n------------------------------------\n"

 

import sys

 

if(len(sys.argv) < 3):

 print "You should enter 2 argument"

elif(len(sys.argv) >=3):

 print "You entered %d argument " %(len(sys.argv)-1)

 print "The sys.argv values are : ", sys.argv

 print "sys.argv values in separte lines are...."

 for i in sys.argv:

  print i

 

print "\n--------------------------------------\n"

 

#END

Chapter 9 - Python Conditionals

 

Step 1

 

Open any text editor (gedit,pico,vi,nano) then enter the following python script and save the file with .py extension.

 

#!/usr/bin/python

#Author : Jijo K Jose

 

print "\n------------------------------------\nChapter 9 - Conditionals \n------------------------------------\n"

 

a = input("Enter integer A : ")

b = input("Enter integer B : ")

if a == b:

 print "A and B are same"

elif a < b:

 print "B is larger"

else:

 print "A is larger"

 

print "\n--------------------------------------\n"

 

#END

Chapter 8 - Python Dictionary Datatypes

 

Step 1

 

Open any text editor (gedit,pico,vi,nano) then enter the following python script and save the file with .py extension.

 

#!/usr/bin/python

#Author : Jijo K Jose

 

print "\n------------------------------------\nChapter 8 - Dictionaries\n------------------------------------\n"

 

name = {'fname':'Jijo','mname':'K','lname':'Jose'}

 

print "\n", type(name)

 

print "\nDictonary Values : ", name

 

print "\nname['mname'] : " + name['mname']

 

print "\nAll keys -keys() : ", name.keys()

 

print "\nAll values -values() : ", name.values()

 

del name['mname']

print "\nDelete value del name['key'] : ", name

 

print "\nIterate through for loop items... -name.iteritems()\n"

for k,v in name.iteritems():

print k + "---->" + v

 

name['fname']= ['Jijo','Jibin','Jijan']

name['mname']= 'K'

name['lname']= 'Jose'

print "\nAdd more value to same key -name['fname']='value' : ", name

 

print "\n------------------------------------\n"

 

#END

 

Chapter 7 - Python List Datatypes

 

Step 1

 

Open any text editor (gedit,pico,vi,nano) then enter the following python script and save the file with .py extension.

 

#!/usr/bin/python

#Author : Jijo K Jose

 

print "\n------------------------------------\nChapter 7 - List\n------------------------------------\n"

 

l1 = [1,2,3,4]

l2 = [5,6,7,8]

 

print "List Manipulations L1 : " ,l1

print "List Manipulations L2 : " ,l2

 

l1.reverse()

print "\nList reverse : ", l1

l1.append(l2)

print "\nList append (Create multi diamension list)  : ", l1 

 

print "\nElement [4][2] is : ", l1[4][2]

 

l1 = [1,2,3,4];

l2 = [5,6,7,8];

 

l1.extend(l2)

print "\nList extend (Create single diamension list)  : ", l1

 

l1.pop()

print "\nRemove last element from list -pop() : ",l1

 

l1.pop(2)

print "\nRemove 2nd element from list -pop(2) : ",l1

 

l1.insert(2,3)

print "\nInsert element into list -insert(,i,val) : ",l1

 

l3=range(5,27,2)

print "\nCreate a range of integers - range(init,end,step) : ",l3

 

print "\n------------------------------------\n"

 

#END

 

Chapter 5 - Python String Operations Part 2

 

Step 1

 

Open any text editor (gedit,pico,vi,nano) then enter the following python script and save the file with .py extension.

 

#!/usr/bin/python

#Author : Jijo K Jose

 

print "\n------------------------------------\nChapter 5 - String 2\n------------------------------------\n"

 

import string

 

a = raw_input("Enter any string : ")

print "%s contains %d character\n" %(a,len(a))

 

b = string.upper(a)

c = a.lower()

d = a.capitalize()

e = string.capwords(a)

 

print "%s in different forms are :"

print b;

print c;

print d;

print e;

 

print "\nSplit function result\n---------------------------------------------"

f = a.split()

print f

 

print "\nJoin function result\n---------------------------------------------"

g = string.join(f)

print g

 

print "\n------------------------------------\n"

 

#END

 

Chapter 4 – Python String Operations Part 1

 

Step 1

 

Open any text editor (gedit,pico,vi,nano) then enter the following python script and save the file with .py extension.

 

#!/usr/bin/python

#Author : Jijo K Jose

 

print "\n------------------------------------\nChapter 4 - String 1\n------------------------------------\n"

 

a = raw_input("Enter any string : ")

print "%s contains %d character" %(a,len(a))

print "\nLast character of %s is : %s" %(a,a[len(a)-1])

print "\nFirst 3 characters are : %s" %(a[0:3])

print "\nEach Characters are..."

for ch in a:

print ch

b = raw_input("\nEnter second string : ")

if a==b:

print "\nStrings are equal"

else:

print "\nStrings are not equal"

 

print "\n------------------------------------\n"

 

#END

 

Chapter 3 – Python Keyboard Inputs

 

Step 1

 

Open any text editor (gedit,pico,vi,nano) then enter the following python script and save the file with .py extension.

 

#!/usr/bin/python

#Author : Jijo K Jose

 

 

print "\n------------------------------------\nChapter 3 - STDIN Input\n------------------------------------\n"

 

msg = raw_input("Enter Your Name : ")

age = input("Enter your age : ")

print "Your name is :" , msg

print "%s, your age is : %d" %(msg,age)

 

print "\n------------------------------------\n"

 

#END

 

Chapter 2 - Python Math Functions

 

Step 1

 

Open any text editor (gedit,pico,vi,nano) then enter the following python script and save the file with .py extension.

 

#!/usr/bin/python

#Author : Jijo K Jose

 

print "\n------------------------------------\nChapter 2 - Math Function\n------------------------------------\n"

 

print "100 divided by 16 is:", 100 / 16 , "& Remainder is:", 100 % 16

 

#END

 

Chapter 1 - Python Hello World Program

 

Step 1

 

Open any text editor (gedit,pico,vi,nano)

 

 

Enter the following python script and save the file with .py extension.

 

#!/usr/bin/python

#Author : Jijo K Jose

 

a="Hello World"

print 'First program was'

print a + "."

 

#END

 

Introduction to Python Programming Language

 

Python is an easy to learn, powerful programming language. It has efficient high-level data structures and a simple but effective approach to object-oriented programming. Python’s elegant syntax and dynamic typing, together with its interpreted nature, make it an ideal language for scripting and rapid application development in many areas on most platforms.

 

The Python interpreter and the extensive standard library are freely available in source or binary form for all major platforms from the Python Web site, http://www.python.org/, and may be freely distributed. The same site also contains distributions of and pointers to many free third party Python modules, programs and tools, and additional documentation.

 

In this tutorial am using linux operating system for compiling python script.

 

Step 1

 

First you need to check, python is already installed in your system by using the following command

 

which python