Question

find how many times a letter appear in a string for example yellowstone letter l appear two times
(using python)

Answer 1

#Python program count.py
#main method
def main():

    #set name
    name ="yellowstone"
    #set letter
    letter='l'

    #print Name
    print('Name :%s'%name)
    #print letter
    print('Letter: %c'%letter)
    #calling count
    c=count(name, letter)
    #print c
    print('count: %d'%c)

#Method count that takes name and letter
#as input arguments and returns number of times
#letter occurs in name
def count(name, letter):
    counter=0
    for i in name:
        if letter==i:
            counter+=1
    return counter
#calling main method
main()

------------------------------------------------------------------------

Sample output:

>>>
Name :yellowstone
Letter: l
count: 2