'''
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.
'''
def count(w,l):
    count = 0
    for letter in w:
        if letter == l:
            count = count + 1
    print count
count('abbcccddddeeeeeffffff','c')
'''
Exercise 6.4 There is a string method called count that is similar to the function in the previous
exercise. Read the documentation of this method at docs.python.org/library/string.
html and write an invocation that counts the number of times the letter a occurs in 'banana'.
'''
print str.count('banana','a')
'''
Exercise 6.5 Take the following Python code that stores a string:‘
str = ’X-DSPAM-Confidence:0.8475’
Use find and string slicing to extract the portion of the string after the colon character and then use the float function to convert the extracted string into a floating point number.
'''
s ='X-DSPAM-Confidence:0.8475'
a=s.find(':')
b=s[a+1:len(s)]
print b
'''
Exercise 6.6 Read the documentation of the string methods at docs.python.org/lib/
string-methods.html. You might want to experiment with some of them to make sure you
understand how they work. strip and replace are particularly useful.
from string import strip, replace
'''
s='softvision'
print strip(s,'soft')
print replace(s,'soft','hard')