Dictionary in Python

What will be the output of following code-

a={1:"A",2:"B",3:"C"}

for i in a:

print(i,end=" ")

What will be the output of following code-

a={i: i*i for i in range(6)}

a

a={}

a[2]=1

a[1]=[2,3,4]

print(a[1][1])

What will be the output of following program:

dictionary = {1:'1', 2:'2', 3:'3'}

del dictionary[1]

dictionary[1] = '10'

del dictionary[2]

print(len(dictionary))

What will be the output of following program:

a={1:5,2:3,3:4}

a.pop(3)

print(a)

What will be the output of following program:

my_dict = {}

my_dict[(1,2,4)] = 8

my_dict[(4,2,1)] = 10

my_dict[(1,2)] = 12

sum = 0

for k in my_dict:

sum += my_dict[k]

print (sum)

What will be the output of following program:

a = {(1,2):1,(2,3):2}

print(a[1,2])

What will be the output of following program:

plant={}

plant[1]='Rohit'

plant[2]='Sharma'

plant['name']='Ishant'

plant[4]='Sharma'

print (plant[2])

print (plant['name'])

print (plant[1])

What will be the output of following program:

test = {1:'A', 2:'B', 3:'C'}

del test[1]

test[1] = 'D'

del test[2]

print(len(test)

Dictionary keys must be immutable and ___________________________________