CS9

d_vwl

December 19, 2016

A quick note on return vs. print

print just shows the human user a string representing what is going on inside the computer. The computer cannot make use of that printing. return is how a function gives back a value. This value is often unseen by the human user, but it can be used by the computer in further functions.

On a more expansive note, print will not in any way affect a function. It is simply there for the human user’s benefit. It is very useful for understanding how a program works and can be used in debugging to check various values in a program without interrupting the program.

Remove the Vowels

In repl, go to de_vowel

Create a function, de_vowel, which will take a string as input and return a copy of that string with all the vowels removed. Otherwise, the string should be the same.

  1. Create the function contract for de_vowel.
def de_vowel(string):
"""
A function contract explains what the function does. So, in this case, yours might look like:

#This function takes a string as an input and returns a copy of the string with the vowels removed.

Write `de_vowel` using a for loop
Provide a few examples that confirm de_vowel works as expected:
	* What if the string is all vowels ('aeiou')?
	* What if there are no vowels ('rdcls')?
	* What if some of the vowels are capital and some are lowercase ('lIKe ThIs?')
	* What if there is a mix of vowels and non-vowels and spaces ('this is silly')?
"""

Example:

def de_vowel(a_string):
	# your code goes here
no_vowels = de_vowel("This sentence has no vowels")
print(no_vowels)
# examples go here

Example output:

Review Adding Strings

Now, before your d_vwl‘d sentence, add a string explaining what’s happening. Like this:

Here is your sentence without vowels: Hr s yr sntnc wtht vwls

Bonus!

Use a counter (variable you define outside of a loop to keep track of a value inside a loop) to create a function count_vowels.

count_vowels takes in a string and returns an int representing the number of vowels in the string.

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