Importat Python Programs

PYTHON PROGRAMS

1. Write a Hello World Python Program

#!/usr/bin/python

print "Hello World!";

2. String Concatenation in python programming

#String concatenation worda='computer'; wordb='science'; print("worda is ",worda); print("wordb is",wordb); wordc=worda+" " +wordb; print("wordc is",wordc); wordd=worda*3; print("wordd is ",wordd); str = 'HelloWorld!' length=len(str);

print ("str :",str);

print("length:",length);

print ("first character is",str[0]);

print ("print character from 2rd to 6th :", str[2:7]       ); print ("Prints string starting from 3rd character:",str[2:]); print ("Prints string two times",str * 2);

print ("Prints concatenated string :",str + "TEST" );

print(str[-1]); #print last character

print(str[-6]);#print character from last 6th position print(str[:-2]);# Everything except the last two characters

3. Write a python program to perform function in Lists

#Python Lists

#!/usr/bin/python

print("\t \t \t Python Lists");

list = [ 'abcd', 786 , 2.23, 'john', 70.2 ]

tinylist = [123, 'john']

print("Prints complete list:",list);

print("Prints first element of the list : ",list[0]);

print("Prints elements starting from 2nd to 4th:",list[1:3]); print("Prints elements starting from 3rd element:",list[2:]); print("Prints list two times:",tinylist * 2);

print("Prints concatenated lists: ", list + tinylist );

#modify the 4th elements in the list

print("Before modifying the 4th element in list :",list[4]);

list[4]='efgh';

print("4th element in list :",list[4]);

print(" complete list:",list);

#Appending new elements

list.append('ijkl');

print("After appending list:",list);

#deleting an element in list

del list[2];

print("List :",list);

4. Write a python program to perform functions in tuples

#Python Tuples

print("\t \t \t Python tuples");

tuple = ( 'abcd', 786 , 2.23, 'john', 70.2  ) tinytuple = (123, 'john') print("\ncomplete tuple :",tuple);

print("Prints first element of the tuple:", tuple[0]); print("Prints elements starting from 1nd to 3th:", tuple[1:4]); print("Prints elements starting from 3rd element:", tuple[2:]); print("Prints tuple two times:", tinytuple * 2    );

print ("concatenated tuple:",tuple + tinytuple );

5. Write a python program to perform functions in Dictionary.

#Python Dictionary

tinydict = {'name': 'john','code':6734, 'dept': 'sales'}

print ("Python Dictionary:" );

print ("complete dictionary",tinydict );

print ("Key :",tinydict.keys()); # Prints all the keys print ("values:",tinydict.values()); # Prints all the values

6. Write a python Program to select odd number from the lists

#!/usr/bin/python

a=[11,12,13,14,15,16,17,18,19,20,21,31,44,45,10]; print("List is:",a);

n=len(a); print("length:",n); i=0;

print("Odd number"); for i in range(len(a)): if(a[i]%2==1): print(a[i]);

7. Conditional statement in Python

>>> x = int(raw_input("Please enter an integer: "))

>>> if x < 0:

... x = 0

... print 'Negative changed to zero'

... elif x == 0:

... print 'Zero'

... elif x == 1:

... print 'Single'

... else:

... print 'More'

8. For Statement in Python

>>> # Measure some strings:

... a = ['cat', 'window', 'defenestrate']

>>> for x in a:

... print x, len(x)

cat 3

window 6

9. The Range() and Len() in Python

>>> a = ['Mary', 'had', 'a', 'little', 'lamb']

>>> for i in range(len(a)):

... print i, a[i]

...

10. Prime Number using Python.

>>> for n in range(2, 10):

... for x in range(2, n):

... if n % x == 0:

... print n, 'equals', x, '*', n/x

... break

... else:

... # loop fell through without finding a factor

... print n, 'is a prime number'

..

11. Simple Class Program in python

>>> class Complex:

... def    init   (self, realpart, imagpart):

... self.r = realpart

... self.i = imagpart

...

>>> x = Complex(3.0, -4.5)

>>> x.r, x.i

(3.0, -4.5)

12. Module Program in Python (Fibonacci Series)

A module is a file containing Python definitions and statements. The file name is the module name with the suffix .py appended. Within a

module, the module’s name (as a string) is available as the value of the global variable    name   . For instance, use your favorite text editor to create a file called fibo.py in the current directory with the following contents:

Step  1:

Fibo.py

def fib(n):   # write Fibonacci series up to n a, b = 0, 1

while b < n:

print b,

a, b = b, a+b

Step 2:

>>> import fibo

Step 3:

>>> fibo.fib(1000)

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