Mohanraj
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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