a = dict({1:"Python",2:"Java",3:"Web",4:"Ruby"})
print(a,type(a))

#pop() function
a.pop(1)
print(a)
#a.pop(1)
#print(a)

#popitem() function
a.popitem()
print(a)

#del() function
del a[2]
print(a)

#del a
#print(a)

#clear() function
a.clear()
print(a)