s3.py

s1="Hello How are you"

#Splits the string and sort based on ascii values.
print (sorted(s1.split()))
#Output:['Hello', 'How', 'are', 'you']

#Splits the string and sort it after performing str.lower on all items
print (sorted(s1.split(),key=str.lower))
#Output:['are', 'Hello', 'How', 'you']

d1={'apple':1,'Banana':2,'Pears':3}
#Returns list of keys ,sorted based on ascii values
print (sorted(d1))
#Output:['Banana', 'Pears', 'apple']

#Returns list of keys,sorted after peforming str.lower on all items
print (sorted(d1,key=str.lower))
#Output:['apple', 'Banana', 'Pears']