Back to Lesson 4

Exercise 1: Playing around with strings

For this exercise, we’ll use the following statements:

s1 = "apple"
s2 = "banana!"

Exercise 1a: from expression to output

Predict the result of evaluating each of the following string expressions.

a) "I would like a " + s2

b) 3 * s1 + s2

c) s2[2:4]

d) s1[3] + s2[3:] + s2[-1]

Exercise 1b: from output to expression

Build a Python expression that could construct each of the following results by performing string operations on s1 and s2.

s1 = "apple"
s2 = "banana!"

a) "nana"

b) "apple banana! apple banana! apple banana!"

Exercise 2: Looping through strings

Show the output that would be generated by each of the following program fragments:

a) for ch in "banana":
       print(ch)

b) for ch in "apple":
       print("#" + ch * 3 + " " + ch)

Exercise 3: Looping through strings, part 2

Show the output that would be generated by the following program fragment:

msg = ""
for ch in "banana":
    msg = msg + chr(ord(ch) + 1)
print(msg)

Back to Lesson 4