month = { "jan" : 31 , "feb" : 28 , "march" : 31 , "april" : 30 , "may" : 31 , "june" : 30 , "july" : 31 , "aug" : 31 , "sept" : 30 , "oct" : 31 , "nov" : 30 , "dec" : 31}

mon = input("Enter the month name in short form :- ")
print("Number of days in ",mon,"=",month [ mon ])
OUTPUT-
Enter the month name in short form :- feb
Number of days in  feb = 28
b) Print out all of the keys in alphabetical order. 
CODE-
month = { "jan" : 31 , "feb" : 28 , "march" : 31 , "april" : 30 , "may" : 31 , "june" : 30 , "july" : 31 , "aug" : 31 , "sept" : 30 , "oct" : 31 , "nov" : 30 , "dec" : 31}

lst = list ( month . keys() )
lst.sort()
print( lst )
OUTPUT-
['april', 'aug', 'dec', 'feb', 'jan', 'july', 'june', 'march', 'may', 'nov', 'oct', 'sept']
c) Print out all of the month with 31 days. 
CODE-
month = { "jan" : 31 , "feb" : 28 , "march" : 31 , "april" : 30 , "may" : 31 , "june" : 30 , "july" : 31 , "aug" : 31 , "sept" : 30 , "oct" : 31 , "nov" : 30 , "dec" : 31}

print( "Month which have 31 days !!-- ")
for i in month :
    if month [ i ] == 31 :
        print( i )
OUTPUT-
Month which have 31 days !!--
jan
march
may
july
aug
oct
dec
d) Print out the (key value) pairs started by the number of days in each month. 
CODE-
month = { "jan" : 31 , "feb" : 28 , "march" : 31 , "april" : 30 , "may" : 31 , "june" : 30 , "july" : 31 , "aug" : 31 , "sept" : 30 , "oct" : 31 , "nov" : 30 , "dec" : 31}

print("Month according to number of days ---")
print("feb")
for i in month :
    if month [ i ] == 30 :
        print(i)
for i in month :
    if month [ i ] == 31 :
        print( i)
OUTPUT-
Month according to number of days ---
feb
april
june
sept
nov
jan
march
may
july
aug
oct
dec