Dictionaries

Dictionary

**[also called hash table, map or objects.] **

A dictionary is an unordered key value pair. It can be string, int, booleans, or tuples but mostly stings are considered You cannot have lists or set as a dictionary because they are immutable A key in a dictionary has to be unique

dictionary = {
    "key": 'value',
    'a': 1,
    'b': [1, 2, 3],
    'c': 'hello',
    'd': True
}
print(dictionary['b'][1])

user = {
    'basket': [1, 2, 3],
    'greet': 'hello',
    'age': 22
}

print(user.get('age'))      # returns None this is used to avoid error
print(user.get('age', 22))  # returns 22 [adds default value]

Another way to create dictionary

user2 = dict(name='Marwa')
print(user2)

Another way for looking things in dict

print('basket' in user)

Methods in dict

print('greet' in user.keys())       # returns True if it exists
print('hello' in user.values())     # returns True if it exists
print(user.items())                 # shows all items in dictionary

user2 = user.copy()                 # copies the keys and values
print(user2)
# Updates the item[if does'nt exist adds new item]

print(user.update({'age': 23}))
print(user.pop("age"))          # pop off age value
print(user.popitem())           # pops off last item
print(user.clear())             # clears the dict

Dictionary inside a list

my_list = [
    {
        "key": 'value',
        'a': 1,
        'b': [1, 2, 3],
        'c': 'hello',
        'd': True
    },
    {
        "key": 'value',
        'a': 2,
        'b': [4, 5, 6],
        'c': 'hi',
        'd': False
    }]
print(my_list[0]['b'][1])