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* fixed the issue in strings/join.py * [pre-commit.ci] auto fixes from pre-commit.com hooks for more information, see https://pre-commit.ci * Update join.py * Update join.py --------- Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com> Co-authored-by: Maxim Smolskiy <mithridatus@mail.ru>
75 lines
2.0 KiB
Python
75 lines
2.0 KiB
Python
"""
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Program to join a list of strings with a separator
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"""
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def join(separator: str, separated: list[str]) -> str:
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"""
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Joins a list of strings using a separator
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and returns the result.
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:param separator: Separator to be used
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for joining the strings.
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:param separated: List of strings to be joined.
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:return: Joined string with the specified separator.
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Examples:
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>>> join("", ["a", "b", "c", "d"])
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'abcd'
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>>> join("#", ["a", "b", "c", "d"])
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'a#b#c#d'
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>>> join("#", "a")
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'a'
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>>> join(" ", ["You", "are", "amazing!"])
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'You are amazing!'
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>>> join(",", ["", "", ""])
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',,'
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This example should raise an
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exception for non-string elements:
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>>> join("#", ["a", "b", "c", 1])
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Traceback (most recent call last):
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...
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Exception: join() accepts only strings
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Additional test case with a different separator:
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>>> join("-", ["apple", "banana", "cherry"])
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'apple-banana-cherry'
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"""
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# Check that all elements are strings
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for word_or_phrase in separated:
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# If the element is not a string, raise an exception
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if not isinstance(word_or_phrase, str):
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raise Exception("join() accepts only strings")
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joined: str = ""
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"""
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The last element of the list is not followed by the separator.
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So, we need to iterate through the list and join each element
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with the separator except the last element.
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"""
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last_index: int = len(separated) - 1
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"""
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Iterate through the list and join each element with the separator.
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Except the last element, all other elements are followed by the separator.
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"""
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for word_or_phrase in separated[:last_index]:
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# join the element with the separator.
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joined += word_or_phrase + separator
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# If the list is not empty, join the last element.
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if separated != []:
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joined += separated[last_index]
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# Return the joined string.
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return joined
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if __name__ == "__main__":
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from doctest import testmod
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testmod()
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