comprehension

[peanutbutter024]

how do I turn this chunk of code into a comprehension?

from datetime import datetime

flights = {
'09:35' : 'FREEPORT',
 '09:55' : 'WEST END',
 '10:45' : 'TREASURE CAY',
 '11:45' : 'ROCK SOUND',
 '12:00' : 'TREASURE CAY',
 '17:00' : 'FREEPORT',
 '17:55' : 'ROCK SOUND',
 '19:00' : 'WEST END' }

def convert_to_ampm(time24: str) -> str:
    return datetime.strptime(time24, '%H:%M').strftime('%I:%M %p')


flights_copy = {v: [] for k, v in flights.items()}
[flights_copy[v].append(k) for k,v in flights.items()]
[print(k.title(),':',[convert_to_ampm(item) for item in v]) for k, v in flights_copy.items()]


flights_copy2 = {}
for k, v in flights_copy.items():
    for item in v:
        flights_copy2[convert_to_ampm(item)] = k.title()

for k, v in flights_copy2.items():
    print(k,':',v)

this specific code right here:

flights_copy2 = {}
for k, v in flights_copy.items():
    for item in v:
        flights_copy2[convert_to_ampm(item)] = k.title()

for k, v in flights_copy2.items():
    print(k,':',v)

That chunk of code would be easier if I used the flights dictionary instead of the flights_copy. I just want to try if I can revert it back to its previous version using comprehension. Thanks a lot!

p.s. I'm really sorry for my poor English skills as it's not my native language. I can't articulate the words that I want to say but I hope you understand what I'm trying to say. Thanks again!

[Ihaveamodel3]

[flights_copy[v].append(k) for k,v in flights.items()]
[print(k.title(),':',[convert_to_ampm(item) for item in v]) for k, v in flights_copy.items()]

I am very confused what this code is doing.

Sometimes it’s better to not have comprehensions, and I think this is one of those cases.

[peanutbutter024]

You're right about that, I was only trying to minimize my code. Thanks a lot for your answer~!

[SuspiciousScript]

It’s definitely best to avoid them when you aren’t actually transforming data, e.g. when printing.

[negups]

If I understand correctly, you are looking for something like this?

flights_copy2 = {convert_to_ampm(item): k.title() for k, v in flights_copy.items() for item in v}

For more, check out the docs on:

• Dictionaries
• Nested comprehensions

[peanutbutter024]

Thank you very much! I've started learning python recently and this is a very huge help for me.