Replace for loop to search index position

[illmattic]

Hi

I have following code which searches for index position of matching string without having to match everything:

sheet_num = []
for x in range(len(list_of_sheets)):
    if sheet_match in list_of_sheets[x]:
            sheet_num.append(x)

I'm looking for a better way to accomplish this as my code is filled with many occurrences of this type of for loop appending to an empty list.

I thought about:

list(map(lambda x: sheet_match in x, list_of_sheets))

But it returns a list of boolean values instead of the index position of the match. I'm sure its simple but I'm not so competent in Python to know it.

Thanks
Matt

[snippsat]

Post working code sample that we can run,also you need to show what list_of_sheets and sheet_match is.

[Yoriz]

matching_sheet_indexes = [
    index for index, sheet in enumerate(list_of_sheets) if sheet_match in sheet
]

[illmattic]

matching_sheet_indexes = [
    index for index, sheet in enumerate(list_of_sheets) if sheet_match in sheet
]

Thank you! This did the trick. I was playing around with enumerate but couldn't get it to work as I'm not familiar with the 'index for index' part. Can I ask more about the code? What does this 'index for index' exactly do as the word 'index' is not called again? I suppose its iterating through the index of list_of_sheets but can you point me to something that clarify for a novice whats exactly happening here. Thanks

[deanhystad]

List comprehension. A shorthand way of writing a for loop that builds a list.

matching_sheet_indexes = []
for index, sheet in enumerate(list_of_sheets):
    if sheet_match in sheet:
        matching_sheet_indexes.append[index]

There are also dictionary, set and generator comprehensions.

[illmattic]

List comprehension. A shorthand way of writing a for loop that builds a list.

matching_sheet_indexes = []
for index, sheet in enumerate(list_of_sheets):
    if sheet_match in sheet:
        matching_sheet_indexes.append[index]

There are also dictionary, set and generator comprehensions.

Thanks.