Modify a dictionary - Printable Version

Modify a dictionary - Printable Version

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Modify a dictionary - NathanF - Aug-29-2019

Hello everyone,

I'm new to coding and currently self-taught using online books. I am creating a dictionary with 30 aliens all the same, then modifying the first 3 to change colour/speed/point value.

The book I'm following gives the below example:

# make an empty list for storing aliens
aliens = []

# make 30 green aliens
for alien_number in range(30):
    new_alien = {'colour': 'green', 'points': 5, 'speed': 'slow'}
    aliens.append(new_alien)

# modify the first 3 aliens
for alien in aliens[:3]:
    if alien['colour'] == 'green':
        alien['colour'] == 'yellow'
        alien['speed'] == 'medium'
        alien['points'] == 10
    elif alien['colour'] == 'yellow':
        alien['colour'] == 'red'
        alien['speed'] == 'fast'
        alien['points'] == 15

# show the first 5 aliens
for alien in aliens[:5]:
    print(alien)
print("...")


# show how many aliens have been created
print(f"Total number of aliens: {len(aliens)}")

The book gives an output different to the one I am receiving and I don't know why. The output I get is:

{'colour': 'green', 'points': 5, 'speed': 'slow'}
{'colour': 'green', 'points': 5, 'speed': 'slow'}
{'colour': 'green', 'points': 5, 'speed': 'slow'}
{'colour': 'green', 'points': 5, 'speed': 'slow'}
{'colour': 'green', 'points': 5, 'speed': 'slow'}
...

but the output in the book shows this:

{'speed': 'medium', 'colour': 'yellow', 'points': 10}
{'speed': 'medium', 'colour': 'yellow', 'points': 10}
{'speed': 'medium', 'colour': 'yellow', 'points': 10}
{'speed': 'slow', 'colour': 'green', 'points': 5}
{'speed': 'slow', 'colour': 'green', 'points': 5}
...

Is the book incorrect? and if so, how do I adapt the code to give me the right output?

RE: Modify a dictionary - buran - Aug-29-2019

on lines 12-14 and 16-18 you have == (i.e. comparison), but it should be = (assignment)
I guess it's your mistake when typing in the code from the book

RE: Modify a dictionary - NathanF - Aug-29-2019

(Aug-29-2019, 03:21 PM)buran Wrote: I guess it's your mistake when typing in the code from the book

Embarrassingly yes Tongue

Thank you for the help!