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POHow to create Python Generator that iterates through date range giving me 3 day segments?
 

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  1. POHow to create Python Generator that iterates through date range giving me 3 day segments?
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    <p>I need to query an API for data over a multi-month period. However, the API chokes on longer than 3-day intervals.</p> <p>So I want to create a generator function to separate my multi-month date range into 3 day segments that I can use while repeatedly calling my function that hits the API: When I pass it the start date and end date, it gives me:</p> <ul> <li>the first time gives me start date,start date +3 days</li> <li>next time gives me start date + 3 days, start date + 6 days</li> <li>each time thereafter it moves forward by 3 day increments</li> <li>until it hits the end date, when it gives me the days remaining to hit the end date if I still have 1 or 2 days left of data to grab</li> <li>stops</li> </ul> <p>Here's my code so far. It will work for the first time, but I'm not sure how to get the start date to increment by 3 days the next time I call the function. And I'm also not sure how if I still have 1 or 2 days left before hitting the final end date to set my <code>until</code> variable to the final end date--I think right now it simply says "there's less than 3 days left until the final date, so let's quit":</p> <pre><code>3_day_segmenter(start, end): start_date = datetime.strptime(start, '%Y-%m-%d') end_date = datetime.strptime(end, '%Y-%m-%d') since = start_date for date in range(int ((end_date - start_date).days)): until = start_date + datetime.timedelta(days=3) yield since, until </code></pre>
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    1. USMartijn Pieters
    1. USJeff Widman
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    1. COpossible duplicate of [Generate a list of datetimes between an interval in python](http://stackoverflow.com/questions/10688006/generate-a-list-of-datetimes-between-an-interval-in-python)
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      1. POHow to create Python Generator that iterates through date range giving me 3 day segments?
      1. USMartijn Pieters
    2. COThat answer provides you with a generator that produces dates by a `timedelta` step size; it's trivial to turn that into something that also produces an end date.
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      1. POHow to create Python Generator that iterates through date range giving me 3 day segments?
      1. USMartijn Pieters
 

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