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I have a form that expects a unique 5-character ID. I have a function that generates this unique ID. Before entering it in the form, I want to compare it with an existing list of IDs. If the generated ID doesn't exist in the list, pass it in a variable; if it does exist and it isn't unique, generate another ID. What's the best way to go about this?
def generate_id(): random_id= ''.join(random.choice(string.ascii_uppercase + string.digits) for _ in range(5)) return random_id existing_ids = ['AAAAA', 'BBBBB', 'CCCCC'] for id in existing_ids: if not generate_id() == id: unique_id = generate_id()
for id in existing_ids:
This denotes the execution of the loop for the number of items in the
existing_ids, which is definitely not what you want.
if not generate_project_id() == id: unique_id = generate_project_id()
Apart from the incorrect method name,
generate_project_id() should have been
generate_id(), this will not do what you think it will, i.e. even if the
id is unique it will store a different
id in the
unique_id since it is calling the method again,
unique_id = generate_project_id() and who knows it could be a dupe!
If the intention is to keep generating unique id's until one that does not exist in the existing list show up, put it in a loop using
set() to exclude any dupes in the existing list:
import string def generate_id(): random_id = ''.join(random.choice(string.ascii_uppercase + string.digits) for _ in range(5)) return random_id existing_ids = ['AAAAA', 'BBBBB', 'CCCCC'] while True: genId = generate_id() if genId not in set(existing_ids): unique_id = genId break
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while True: a = generate_id() if a not in set(existing_ids) : break
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import random import string def generate_id(): random_id = '' random_id = ''.join(random.choice (string.ascii_uppercase + string.digits) for _ in range(5)) return random_id existing_ids = ['AAAAA', 'BBBBB', 'CCCCC'] unique_id = generate_id() while unique_id in existing_ids: unique_id = generate_id() if unique_id not in existing_ids: break; print(unique_id)
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I think you could try bitmap? Because 5 chars could construct a number which <
2**32, so you can generate a random number [0-
26**6] and use it to mod 26 to get the only 5 chars,
you can use bitmap to check if it exists.
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- Works fine for me, where are you stuck?
- EXCEPT just one thing.
while Trueinstead of
while 1. It's clearer. Also:
existing_idsshould be a
setotherwise it's going to take forever.