A quick try except in python

Please use try/except for cross service or real time user input validation, its safer to throw exception rather failing the whole program

# Program to convert all given values into int

# Ex. of try except

for v in 1,2,10,'a',4,5,10,'v',"abc",1:

        try:

                print "Vint:",int(v)

        except ValueError as ex:

                print "{} cannot be converted to int: {}".format(v,ex)

Counting the vowels

There are many ways to count the vowels in python, here is one

# Program to count vowels in given sentence

count=0

vowels={'a':0,'e':0,'i':0,'o':0,'u':0}

print "Program to count vowels in given sentence"

sentence=raw_input('Enter sentence? ')

for i in sentence:

if i.lower() in vowels.keys():

count+=1

vowels[i.lower()]+=1

print "Vowel count:", count

print "Each vowel count"

for k,v in vowels.items():

print '\t',k,':',v

first 100 prime numbers

Using sieve of Eratosthenes method to find first 100 prime numbers..

The program might not be exact ..its learning curve will improve on.. :)

#!/usr/bin/env python

"""

  Program to list out the first 100 prime numbers

  sieve of Eratosthenes Method

"""

def getprime(n):

    ret=[]

    cancel=[]

    for i in range( 2, n+1):

        if i not in cancel:

            ret.append(i)

        for j in range (i,n+1,i):

            cancel.append(j)

    return ret

if __name__=='__main__':

print getprime(100)

Take a look: 

https://en.wikipedia.org/wiki/Sieve_of_Eratosthenes

https://en.wikipedia.org/wiki/Prime_number