Beeminder weekends off function

beeminder.py

def beeminder_weekends_off(username, goal, auth_token):
    # requests (http://docs.python-requests.org/en/stable/) is used for the requests
    import requests
    # I use too many time libraries...
    import time as tt
    from datetime import date, time, datetime, timedelta
    #base API url
    url = "https://www.beeminder.com/api/v1/users/"+username+"/goals/"+goal+".json"
    with requests.Session() as s:
        r = s.get(url, params=auth_token)
        data = r.json()
        #get the road:
        road = data['roadall']
        #what the weekday is today
        current_weekday = date.fromtimestamp(tt.time()).weekday()
        #find the distance to the next friday we can actually change (beyond the akrasia horizon)
        editable_next_fri = timedelta(7 - current_weekday + 4) if current_weekday > 4 else timedelta(4-current_weekday)
        # the friday we can edit.  Using date so we get days rather than datetime.
        date_wanted = date.fromtimestamp(tt.time()) + editable_next_fri + timedelta(7)

        #the slope over the weekend
        wanted_slope = 0

        #read the whole road, figure out what the slope should be on the date we want, and what it should be after what we want.
        for i, (t, val, slope) in reversed(list(enumerate(road))):
            # compare dates for the monday after (not times) to see if the slope over the weekend is 
            # already set.  Note, if the "weekend" doesn't start on a friday we don't actually check that.
            if date.fromtimestamp(t) == date_wanted + timedelta(3) and slope == 0:
                return # we are already on a break, and don't need to change anything.
            if date.fromtimestamp(t) < date_wanted:
                break # the last point we saw contains the slope we want.
            else:
                #if we aren't before the end date of the weekend, we record the slope.  This is the slope after the weekend.
                wanted_slope = slope
        if i == 0:
            #we didn't find the date... something went wrong.
            raise
        #we now have the wanted slope, and the point to insert it at (i), so we can insert things correctly:
        road = data["roadall"][0:i+1] + \
            [[int(datetime.combine(date_wanted, time(0)).timestamp()),None,wanted_slope]] + \
            [[int(datetime.combine(date_wanted + timedelta(3),time(0)).timestamp()),None,0]] + data["roadall"][i+1:]
        
        #create the payload for the requests library.
        payload = {"roadall": road }
        #add the authorization token
        payload.update(auth_token)
        print(payload)
        #send it along.  The payload must be sent using the json field rather than the data field
        # otherwise things don't work.
        r = s.put(url, json=payload)
        print(r.request.body)
        r.raise_for_status()
    return r

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