From b98069b1898d1958f54a1a38ccf56a2bfa75d37d Mon Sep 17 00:00:00 2001 From: Roaa421 Date: Mon, 1 Dec 2025 18:37:51 +0300 Subject: [PATCH] Add utility functions for list and dict operations This file contains functions to remove duplicates from a list, count occurrences of items in a list, and reverse keys and values of a dictionary. --- Week03/sequences_first_last.py | 32 ++++++++++++++++++++++++++++++++ 1 file changed, 32 insertions(+) create mode 100644 Week03/sequences_first_last.py diff --git a/Week03/sequences_first_last.py b/Week03/sequences_first_last.py new file mode 100644 index 00000000..8fc35387 --- /dev/null +++ b/Week03/sequences_first_last.py @@ -0,0 +1,32 @@ +def remove_duplicates(seq: list) -> list: + """ + This function removes duplicates from a list. + """ + unique = [] + for item in seq: + if item not in unique: + unique.append(item) + return unique + + +def list_counts(seq: list) -> dict: + """ + This function counts the number of occurrences of each item in a list. + """ + counts = {} + for item in seq: + if item in counts: + counts[item] += 1 + else: + counts[item] = 1 + return counts + + +def reverse_dict(d: dict) -> dict: + """ + This function reverses the keys and values of a dictionary. + """ + reversed_d = {} + for key, value in d.items(): + reversed_d[value] = key + return reversed_d