#🔒 help getting started with a confusing function

8 messages · Page 1 of 1 (latest)

cyan axle
#

i have a function to get a weather report inside of a file 'weather.json' i dont need to open and read the file and to be honest it would be rather easy but some test cases dont have a matching dictionary key, in these cases i need to use the most recent timestamp before it and pull that one instead. any idea on how i would start this??

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swift trellisBOT
#

@cyan axle

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cyan axle
#

specification

def get_weather_report(takeoff,weather):
    """
    Returns the most recent weather report at or before take-off.
    
    The weather is a dictionary whose keys are ISO formatted timestamps and whose values 
    are weather reports.  For example, here is an example of a (small portion of) a
    weather dictionary:
        
        {
            "2017-04-21T08:00:00-04:00": {
                "visibility": {
                "prevailing": 10.0,
                "units": "SM"
            },
            "wind": {
                "speed": 13.0,
                "crosswind": 2.0,
                "units": "KT"
            },
            "temperature": {
                "value": 13.9,
                "units": "C"
            },
            "sky": [
                {
                    "cover": "clouds",
                    "type": "broken",
                    "height": 700.0,
                    "units": "FT"
                }
            ],
            "code": "201704211056Z"
        },
# 
"""
        "2017-04-21T07:00:00-04:00": {
            "visibility": {
                "prevailing": 10.0,
                "units": "SM"
            },
            "wind": {
                "speed": 13.0,
                "crosswind": 2.0,
                "units": "KT"
            },
            "temperature": {
                "value": 13.9,
                "units": "C"
            },
            "sky": [
                {
                    "type": "overcast",
                    "height": 700.0,
                    "units": "FT"
                }
            ],
            "code": "201704210956Z"
        }
        ...
    },
    
    If there is a report whose timestamp matches the ISO representation of takeoff, 
    this function uses that report.  Otherwise it searches the dictionary for the most
    recent report before (but not equal to) takeoff.  If there is no such report, it
    returns None.
    
    Example: If takeoff was as 8 am on April 21, 2017 (Eastern), this function returns 
    the value for key '2017-04-21T08:00:00-04:00'.  If there is no additional report at
    9 am, a 9 am takeoff would use this value as well.
    
    Parameter takeoff: The takeoff time
    Precondition: takeoff is a datetime object
    
    Paramater weather: The weather report dictionary 
    Precondition: weather is a dictionary formatted as described above
    """
spark siren
#

Check if the timestamp is available. If not, create a temp variable and iterate through the .json file (which is basically a dictionary). Everytime the timestampt of the current iteration is newer than the one in the temp variable, replace it.

cyan axle
#

alright

swift trellisBOT
#
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