Creating a list of range of dates in Python
Given a date, and the task is to write a Python program to create a list of range of dates with the next K dates starting from the current date.
Examples:
Input : test_date = datetime.datetime(1997, 1, 4), K = 5
Output : [datetime.datetime(1997, 1, 4, 0, 0), datetime.datetime(1997, 1, 5, 0, 0), datetime.datetime(1997, 1, 6, 0, 0), datetime.datetime(1997, 1, 7, 0, 0), datetime.datetime(1997, 1, 8, 0, 0)]
Explanation : 5 dates after 4 January are extracted in list.
Input : test_date = datetime.datetime(1997, 1, 4), K = 4
Output : [datetime.datetime(1997, 1, 4, 0, 0), datetime.datetime(1997, 1, 5, 0, 0), datetime.datetime(1997, 1, 6, 0, 0), datetime.datetime(1997, 1, 7, 0, 0)]
Explanation : 4 dates after 4 January are extracted in list.
Method #1 : Using timedelta() + list comprehension
In this, we get to add consecutive deltas to day using timedelta(), and list comprehension is used to iterate through the required size and construct the required result.
Python3
# Python3 code to demonstrate working of# Get Construct Next K dates List# Using timedelta() + list comphehensionimport datetime # initializing datetest_date = datetime.datetime(1997, 1, 4) # printing original dateprint("The original date is : " + str(test_date)) # initializing K K = 5 # timedelta() gets successive dates with # appropriate differenceres = [test_date + datetime.timedelta(days=idx) for idx in range(K)] # printing resultprint("Next K dates list : " + str(res)) |
Output:
The original date is : 1997-01-04 00:00:00
Next K dates list : [datetime.datetime(1997, 1, 4, 0, 0), datetime.datetime(1997, 1, 5, 0, 0),
datetime.datetime(1997, 1, 6, 0, 0), datetime.datetime(1997, 1, 7, 0, 0), datetime.datetime(1997, 1, 8, 0, 0)]
Method #2 : Using count() + generator function
In this, we perform a similar task as the above function, using a generator to perform the task of date successions.
Python3
# Python3 code to demonstrate working of# Get Construct Next K dates List# Using count() + generator functionimport datetimeimport itertools # initializing datetest_date = datetime.datetime(1997, 1, 4) # printing original dateprint("The original date is : " + str(test_date)) # initializing K K = 5 # timedelta() gets successive dates with # appropriate differencegen_fnc = ( test_date - datetime.timedelta(days=idx) for idx in itertools.count()) # islice passes counterres = itertools.islice(gen_fnc, K) # printing resultprint("Next K dates list : " + str(list(res))) |
Output:
The original date is : 1997-01-04 00:00:00
Next K dates list : [datetime.datetime(1997, 1, 4, 0, 0), datetime.datetime(1997, 1, 3, 0, 0),
datetime.datetime(1997, 1, 2, 0, 0), datetime.datetime(1997, 1, 1, 0, 0), datetime.datetime(1996, 12, 31, 0, 0)]
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