Return the dates within the same week as the given date.

dates_in_week.py

#!/usr/bin/env python3
from collections import namedtuple
from datetime import datetime


def get_week_dates(date_str):
    """Return the dates within the same week as the given date.
    Args:
        date_str (str): A date string in ISO format (e.g., '2021-01-01').
    Returns:
        list: A list of `DateAttrs` namedtuples, where each tuple includes the
            following attributes for a day in the specified ISO week:
            - year: Year of the date.
            - week: ISO week number corresponding to the date.
            - month: Month of the date.
            - day: Day of the date.
            - day_of_week: Name of the day of the week (e.g., 'Mon', 'Tue').
    """
    base_date = datetime.fromisoformat(date_str).isocalendar()
    DateAttrs = namedtuple('DateAttrs', 'year week month day day_of_week')
    dates = []
    for i in range(1, 8):
        each_date = datetime.fromisocalendar(base_date[0], base_date[1], i).date()
        dates.append(
            DateAttrs(
                each_date.year,
                base_date[1],  # ISO week number
                each_date.month,
                each_date.day,
                each_date.strftime('%a')
            )
        )
    return dates


def date_str_from_stdin():
    date_input = input('Date? (yyyy-mm-dd or RETURN for today) >> ')
    my_date = str(datetime.now().date()) if date_input == '' else date_input
    return get_week_dates(my_date)


if __name__ == '__main__':
    dates_ = date_str_from_stdin()
    for date_ in dates_:
        print(date_)