Short clear solution for Between Markers (simplified) by PistoleroAlan - python coding challenges

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Short solution in Clear category for Between Markers (simplified) by PistoleroAlan

between_markers=lambda text,start,end:text[text.index(start)+1:text.index(end)]

print("Example:")
print(between_markers("What is >apple<", ">", "<"))

# These "asserts" are used for self-checking
assert between_markers("What is >apple<", ">", "<") == "apple"
assert between_markers("What is [apple]", "[", "]") == "apple"
assert between_markers("What is ><", ">", "<") == ""
assert between_markers("[an apple]", "[", "]") == "an apple"

print("The mission is done! Click 'Check Solution' to earn rewards!")

Aug. 22, 2023

Comments:

a8696tk on Feb. 20, 2024, 9:11 a.m.
Not bad, however there is a small improvement that could be made: your code does not account for cases where the start marker does not occur in the text, or when the end marker is before the start marker. In this case, your function will raise a ValueError. You can add checks for this to make the function more reliable: betweenmarkers = lambda text, start, end: text[text.find(start) + 1: text.find(end)] if (idxstart := text.find(start)) != -1 and idx_start < text.find(end) else '' This takes into account both of these cases and returns an empty string if one of them occurs.

PistoleroAlan on Feb. 20, 2024, 4:20 p.m.
Hi, I didn't consider these 2 exceptions you mentioned because the condition "Initial and final markers always exist in a string and go one after the other." is given in the text of the mission so the string sent to the program is supposed to respect it.

Strings and Integers

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