使用列表中存在的 substring 提取字符串的更快/更好的方法？

Question

I have a couple of lists generator = ["one#zade", "one#zaat", "one#osde", "one#za"] & accepted_channels = ["zade", "zaat"] .

I am trying to extract elements from the generator list which have as a substring any one of the values that are present in the accepted_channels list.

I have a code and it works correctly, but it has 3 loops involved. Is there a way to write the code without any loops or with a reduced number of loops?

generator = ["one#zade", "one#zaat", "one#osde", "one#za"]
accepted_channels = ["zade", "zaat"]
final_records = []
for item in generator:
    for channel in accepted_channels:
        if channel in item:
            final_records.append(item)
            
print(final_records) # prints ['one#zade', 'one#zaat']

PS: Here, the generator only has 4 elements, but in real I have a list of more than 50000 elements.

Answer 1

You should probably use filter()

generator = ["one#zade", "one#zaat", "one#osde", "one#za"]
accepted_channels = ["zade", "zaat"]

def check(s):
    return any(y in s for y in accepted_channels)

print(list(filter(check, generator)))

Output:

['one#zade', 'one#zaat']

Performance check:

Built generator list with 50_000 elements each of 8 pseudo-random characters. Duration was 0.016s