Compute with Words

The computer can also compute with words, or more accurately, with strings which are sequences of characters. We can create a string by typing characters between a pair of single ('Hi'), double ("Hi"), or triple quotes (‘’’Hi’’’). We can “compute” with strings using some of the same basic arithmetic operators – they just mean something different here. Here we generate silly song lyrics by using + to combine (append) two strings and * to repeat strings.

Underneath the program below, to the right of the Run button , you’ll see the button to open the audio tour for this program: . Click on that button and then click on “Line-by-line Tour” to hear the audio tour. You can use the provided buttons to pause, play, jump ahead, or go back.

basic = "Ma" print(basic) basic3 = basic + basic + basic print(basic3) next = "Mow" next3 = next * 3 print(next3) together = (basic * 3) + (next * 2) print(together) print(together + "Mmm" + together)

A string can also be asked to return a new string that is changed in some way from the original string. In the example below, we’ll take a string in all-caps and turn it into a nicely capitalized sentence. This example uses dot-notation (sentence.lower()) which is the way to tell a string how we want it to change.

sentence = "THIS IS A TEST" better = sentence.lower() print(better) betterStill = better.capitalize() + "." print(betterStill)

csp-1-4-3: What would the following code print?

first = "Hi"
next = "There"
print ((first + next) * 2)

• Hi There
• When you add strings together you copy the second string right after the first, without any added space
• HiThere
• Remember that * 2 repeats two copies of the same string
• Hi There Hi There
• Adding strings together and repeating them doesn't add spaces between the strings
• HiThereHiThere
• Strings are added together without adding any space and they are repeated without adding a space
• HiThere2
• The * 2 repeats the string two times

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