w3resource python dictionary

add_key.py

'''Write a Python script to add a key to a dictionary

Sample Dictionary : {0: 10, 1: 20}
Expected Result : {0: 10, 1: 20, 2: 30}'''

dict = {0:10, 1:20}
dict[2] = 30
for k, v in dict.items():
  print(k, v)

check_key.py

'''Write a Python script to check whether a given key already exists in a dictionary.'''

dictionary = {1: 10, 2: 20, 3: 30, 4: 40, 5: 50, 6: 60}
key = int(input('Enter the key to check: '))
if key in dictionary.keys():
    print('YES')
else:
    print('NO')

combine_2_dictionaries.py

'''Write a Python program to combine two dictionary adding values for common keys'''

d1 = {'a': 100, 'b': 200, 'c':300}
d2 = {'a': 300, 'b': 200, 'd':400}
for key in d2:
    if key in d1:
        d1[key]+=d2[key]
    else:
        d1[key] = d2[key]

for k, v in d1.items():
    print(k, v)

concatenate.py

''' Write a Python script to concatenate following dictionaries to create a new one.

Sample Dictionary :
dic1={1:10, 2:20}
dic2={3:30, 4:40}
dic3={5:50,6:60}
Expected Result : {1: 10, 2: 20, 3: 30, 4: 40, 5: 50, 6: 60}'''

dict1 = {1:10, 2:20}
dict2 = {3:30, 4:40}
dict3 = {5:50, 6:60}
dict1.update(dict2)
dict1.update(dict3)
for k, v in dict1.items():
    print(k, v)

dict_from_string.py

'''Write a Python program to create a dictionary from a string
Note: Track the count of the letters from the string.
Sample string : 'w3resource' '''

string = 'w3resource'
d = {}
for letter in string:
    if letter not in d:
        d[letter] = 1
    else:
        d[letter]+=1
for k, v in d.items():
    print(k, v)

for_loop_in_dictionary.py

'''Write a Python program to iterate over dictionaries using for loops'''


dictionary = {1: 10, 2: 20, 3: 30, 4: 40, 5: 50, 6: 60}
for key, value in dictionary.items():
    print(f'{key} : {value}')
print('keys:', end='\t')
for key in dictionary.keys():
    print(key,end = ' ')
print()
print('values:', end='\t')
for value in dictionary.values():
    print(value,end = ' ')
print()

generate_dictionary.py

'''Write a Python script to generate and print a dictionary that contains a number (between 1 and n) in the form (x, x*x)'''

d = {}
n = int(input())
d = {i:i*i for i in range(1, n+1)}
for k ,v in d.items():
    print(k ,v)

is_dic_empty.py

'''Write a Python program to check a dictionary is empty or not'''

d = {}
n = int(input())
d = {i:i*i for i in range(1, n+1)}
if len(d)>0:
    print ('Dictionary is not empty')
else:
    print('Dictionary is empty')

map_2_list.py

'''Write a Python program to map two lists into a dictionary.'''

l1, l2 = [], []
n = int(input())
for i in range(1, n+1):
    l1.append(i)
    l2.append(i*i)

d = {l1[i]:l2[i] for i in range(len(l1))}
for k, v in d.items():
    print(k, v)

max_and_min_value.py

'''Write a Python program to get the maximum and minimum value in a dictionary'''

d = {}
n = int(input())
d = {i:i*i for i in range(1, n+1)}
maxi = 0
for value in d.values():
    if value>maxi:
        maxi = value
mini = maxi
for value in d.values():
    if mini>value:
        mini = value
print(f'The maximum value in dictionary is {maxi}, the minimum value is {mini}')

multiply.py

'''Write a Python program to multiply all the items in a dictionary'''

d = {}
n = int(input())
d = {i:i*i for i in range(1, n+1)}
sum_of_keys, sum_of_values, sum_of_all_items = 1, 1, 1
for k ,v in d.items():
    sum_of_keys *=k
    sum_of_values *=v
    sum_of_all_items *= k+v

print(f'multiply of all items is: {sum_of_all_items}\nmultiply of keys is : {sum_of_keys}\nmultiply of values is : {sum_of_values}')

remove_key.py

'''Write a Python program to remove a key from a dictionary.'''

d = {}
n = int(input())
d = {i:i*i for i in range(1, n+1)}
key_to_remove = int(input('Please enter the key that you want to remove '))
if key_to_remove in d:
    del d[key_to_remove]
    for key in d.keys():
        print(key, end= ' ')
else:
    print('Key is not in dictionary')

sum.py

'''Write a Python program to sum all the items in a dictionary'''

d = {}
n = int(input())
d = {i:i*i for i in range(1, n+1)}
sum_of_keys, sum_of_values, sum_of_all_items = 0, 0, 0
for k ,v in d.items():
    sum_of_keys +=k
    sum_of_values +=v
    sum_of_all_items += k+v

print(f'sum of all items is: {sum_of_all_items}\nsum of keys is : {sum_of_keys}\nsum of values is : {sum_of_values}')