Python Create a function that will use a nested conditional

Python. Create a function that will use a nested conditional structure in order to sort the dates into three categories: future, present, and past. Use the January and 2016 as the present date. In your main program, output the dates into the three categories (future, present, past) as well as the number of dates in each category.

e.g) input.txt

January 2015

May 2016

June 2011

December 2020

January 2016

e.g) output.txt

Future: 2

May 2016

December 2020

Present: 1

January 2016

Past: 2

January 2015

June 2011

Solution

PROGRAM CODE:

def sortDate(array, number): # Function starting
Dates = []
for value in array
mon_year = value
mon_year = mon_year.split() # splitting to get the month and year separately
if(number == 1): # Checking for past
if(mon_year[1]<2016):
Dates.append(value)
if(number == 2): # checking for present
if(mon_year[1] == 2016 & mon_year[0] == \"January\"):
Dates.append(value)
if(number == 3): # checking for Future
if((mon_year[1] == 2016 & mon_year[0] >= \"January\")|(mon_year[1] > 2016)):
Dates.append(value)
return Dates #Function Ending
  
DatesArray = []
with open(\"file.txt\", \"r\") as ins: # reading from file
for line in ins:
DatesArray.append(line) # storing in array
     
past = sortDate(DatesArray, 1) # 1 - represents past
present = sortDate(DatesArray, 2) # 2 - represents present
future = sortDate(DatesArray, 3) # 3 - represents future
file = open(\"output.txt\", \"w\") # writing to a file

#Printing future
file.write(\"Future: \"+len(future)+\"\ \")
for x in future:
file.write(x+\"\ \")
#Printing present
file.write(\"Present: \"+len(present)+\"\ \")
for y in present:
file.write(y+\"\ \")
#Printing past
file.write(\"Future: \"+len(past)+\"\ \")
for z in past:
file.write(z+\"\ \")
file.close()

OUTPUT:

Future: 2
May 2016
December 2020
Present: 1
January 2016
Past: 2
January 2015
June 2011