6.3

# #!/usr/bin/python
#
# By dvdjaco
# Exercise 6.3
#
# Encapsulate this code in a function named count, and generalize it so that it accepts the string and the letter as arguments.

# count the number of times that 'letter' occurs in 'string' and return that number
def count(string, letter):
    c = 0
    for l in string:
        if l == letter:
            c = c +1
    return c

# test it
lc = count('test string', 't')
print lc