Exercise 3.1

Given the following code:

x = 'hi'
y = x
x = 'bye'

What the following expressions do and/or return in the Python interpreter? Be prepared to justify your answer using a picture.

• x[1]
• x[0] = 'p'
• x.upper()
• y[1]
• y[3]

Exercise 3.2

Given the following code:

x = [1, 2, 3]
y = x

What the following expressions do and/or return in the Python interpreter? Be prepared to justify your answer using a picture.

• y
• y[0] = 'one'
• z = x + y
• x[1] = 'two'
• z.append(4)

Exercise 3.3

Given the following code:

x = ('one', 'two', 'three')
y = ('four', 'five')

What the following expressions do and/or return in the Python interpreter? Be prepared to justify your answer using a picture.

• x[2]
• y.append('six')
• x + y

Exercise 3.4

Given the following code:

x = {}
x['july'] = 90.3
x['january'] = 20.2

What the following expressions do and/or return in the Python interpreter? Be prepared to justify your answer using a picture.

• x
• x['january']
• x['July']
• len(x)
• x.update({'february': 20.8})