program:d={1:"First",2:"Second",3:"Third"}print(d)d[4]="Fourth"print(d)
d={1:"First",2:"Second",3:"Third"}
print(d)
d[4]="Fourth"
output:
{1: 'First', 2: 'Second', 3: 'Third'}
{1: 'First', 2: 'Second', 3: 'Third', 4: 'Fourth'}