How to Determine the Week Number of a Specific Date in Python?

Determining Week Number in Python

Finding the current week number of the year can be a useful task in various programming applications. Python provides a convenient method to achieve this using the datetime module.

Problem:

How do you determine the week number of the current year on a specific date, such as June 16th (wk24)?

Solution:

The datetime.date object offers an isocalendar() method that returns a tuple containing the calendar week information:

<code class="python">import datetime

date_obj = datetime.date(2010, 6, 16)
week_number = date_obj.isocalendar()[1]

print(week_number)  # Output: 24</code>

The isocalendar() method returns a tuple of three values: (year, week_number, weekday_number). The second element of the tuple represents the week number of the year.

In Python 3.9 and above, isocalendar() returns a namedtuple with explicit fields: year, week, and weekday. This allows you to access the week number using attribute notation:

<code class="python">import datetime

date_obj = datetime.date(2010, 6, 16)
week_number = date_obj.isocalendar().week

print(week_number)  # Output: 24</code>

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