Question

The format for this function is numLen(s,n): where s is a string and n is an integer. What the code is supposed to do is return the number of words in the string that have length n, so:

numLen(“This is a test”, 4)

Would return 2, since two words have 4 characters.

def numLen(s, n):
'''
takes string s and integer n as parameters and returns the number of words
in the string s that have length n
'''
return s.split()
if len(s) == n:
    return 'hello'

I attempted to split the string into a list and check the length of each word in that list, but that didn’t seem to work out. The farthest I managed to get was returning “hello” when I replaced 4 with 14, just to see if the length code would work.

Answer 1

Try this:

def numLen(s, n):
    return sum(1 for x in s.split() if len(x) == n)

I’m using a generator expression, it works like this:

• First, we split the string s in words using split()
• Then, we filter those words that have exactly length n
• We add 1 for each of those that meet the condition
• And finally we add all the 1s