How Can I Efficiently Iterate Through a Range of Dates in Python?

Iterating through a Range of Dates in Python

Iterating through a range of dates can be a common task in Python programming. While nested loops can be used to accomplish this, there are more efficient and elegant solutions available.

One approach involves using a generator expression in a list comprehension. This method calculates the day count between the start and end dates and generates a list of dates within that range. However, it includes an unnecessary conditional check.

To simplify the process, the generator expression can be used alone, without the need for a list comprehension. This removes the unnecessary iteration and retains the essence of iterating through a linear sequence.

For an even more refined approach, consider using a generator function to abstract the date iteration process. This enables encapsulation of the iteration logic and provides a concise and reusable mechanism for generating date ranges.

Here's an example of using a generator function for date iteration:

from datetime import date, timedelta

def daterange(start_date: date, end_date: date):
    days = (end_date - start_date).days
    for n in range(days):
        yield start_date + timedelta(n)

start_date = date(2013, 1, 1)
end_date = date(2015, 6, 2)

for single_date in daterange(start_date, end_date):
    print(single_date.strftime("%Y-%m-%d"))

This solution avoids the complexities of nested loops and list comprehensions while providing a clear and modular way to iterate through a range of dates.

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