Dictionary in Python

• Dictionary in Python is represented with key value pairs.
• Keys must be unique whereas values are not.
• Let’s understand some basics by example:

>>> a_dict = {}    >>> a_dict = { "abc" : "String 1" }    >>> a_dict    {'abc': 'String 1'}    >>> a_dict["abc"] = "String Change"    >>> a_dict    {'abc': 'String Change'}    >>> a_dict["abc"]    'String Change'    >>> a_dict[0] = "New dictionary item where key is integer"    >>> a_dict    {'abc': 'String Change', 0: 'New dictionary item where key is integer'}    >>> a_list = [1,2,3]    >>> a_dict['some_list'] = a_list    >>> a_dict    {'abc': 'String Change', 0: 'New dictionary item where key is integer', 'some_list': [1, 2, 3]}    >>> # above was putting a list inside dictionary    ...    >>> # now putting a dictionary inside dictionary    ...    >>> a_dict['dict_replica'] = a_dict    >>> a_dict    {'abc': 'String Change', 0: 'New dictionary item where key is integer', 'some_list': [1, 2, 3], 'dict_replica': {...}}    >>> a_dict["dict_replica"]    {'abc': 'String Change', 0: 'New dictionary item where key is integer', 'some_list': [1, 2, 3], 'dict_replica': {...}}    >>> # Hence, proving dictionaries can store all sorts of things. Cool and Weird.    ...    >>> len(a_dict)    4    >>> str(a_dict)    "{'abc': 'String Change', 0: 'New dictionary item where key is integer', 'some_list': [1, 2, 3], 'dict_replica': {...}}"    >>> type(a_dict)    <class 'dict'>    >>> temp_dict = {"key": "value"}    >>> temp_dict    {'key': 'value'}    >>> temp_dict.clear()    >>> temp_dict    {}    >>> del temp_dict    >>> temp_dict    Traceback (most recent call last):      File "<stdin>", line 1, in <module>    NameError: name 'temp_dict' is not defined    >>> a_dict.copy()    {'abc': 'String Change', 0: 'New dictionary item where key is integer', 'some_list': [1, 2, 3], 'dict_replica': {'abc': 'String Change', 0: 'New dictionary item where key is integer', 'some_list': [1, 2, 3], 'dict_replica': {...}}}    >>> a_dict    {'abc': 'String Change', 0: 'New dictionary item where key is integer', 'some_list': [1, 2, 3], 'dict_replica': {...}}    >>> a_dict.items()    dict_items([('abc', 'String Change'), (0, 'New dictionary item where key is integer'), ('some_list', [1, 2, 3]), ('dict_replica', {'abc': 'String Change', 0: 'New dictionary item where key is integer', 'some_list': [1, 2, 3], 'dict_replica': {...}})])    >>> a_dict.keys()    dict_keys(['abc', 0, 'some_list', 'dict_replica'])    >>> temp_dict = {"key": "value"}    >>> a_dict.update(temp_dict)    >>> a_dict    {'abc': 'String Change', 0: 'New dictionary item where key is integer', 'some_list': [1, 2, 3], 'dict_replica': {...}, 'key': 'value'}    >>> a_dict.values()    dict_values(['String Change', 'New dictionary item where key is integer', [1, 2, 3], {'abc': 'String Change', 0: 'New dictionary item where key is integer', 'some_list': [1, 2, 3], 'dict_replica': {...}, 'key': 'value'}, 'value'])    >>>