/Python/How to reverse a dictionary in python

How to reverse a dictionary in python

Invert dictionary python

inv_map = {v: k for k, v in my_map.items()}

Source: stackoverflow.com

How to reverse a dictionary in python

def inverse_dict(my_dict):
    """
    the func get a dictinary and reverse it, the keys become values and the values become keys.
    :param my_dict: the dictinary that need to be reversed.
    :return: a VERY pretty dictionary.
    """
    result_dict = {}
    for key, value in my_dict.items():
        if not value in result_dict.keys():
            result_dict[value] = []
        result_dict[value].append(key)
    return result_dict, print(result_dict)

Reverse python dictionary

inv_map = {v: k for k, v in my_map.iteritems()}

Source: stackoverflow.com

How to reverse a dictionary in python

def inverse_dict(my_dict):
    """The function accepts a dictionary as a parameter.
    The function returns a new dictionary with "inverted" mapping:
    each key in the transmitted dictionary is a value in the returned dictionary
    and value entry in the transmitted dictionary is a key in the returned dictionary.
    :param my_dict: dictionary
    :type my_str: string
    :return: Dictionary
    :rtype: Dictionary
    """
    new_dict = {}                                   # create empty Dictionary
    for itm1 in my_dict.items():
        lst = []
        for itm2 in my_dict.items():
            if itm2[1] == itm1[1]:
                lst.append(itm2[0])
        new_dict[itm1[1]] = sorted(lst)

    return new_dict

Similar codes

1 vote192 views1 answer
Python define an array of dictonary
Python
0 vote193 views1 answer
ValueError: invalid PNG header
Python
0 vote189 views1 answer
File "<ipython-input-12-48c6c043344b>", line 29 coin = random.randint(0,1) ^ IndentationError: expected an indented block
Python
22 votes227 views1 answer
Python test if number in string
Python
0 vote204 views1 answer
Rename one dataframe column python in inplace
Python
3 votes195 views1 answer
How to time a python script
Python
0 vote198 views1 answer
Python add commas to list
Python
8 votes303 views2 answers
Tkinter disable button styles
Python
0 vote210 views1 answer
Print("Default max_rows: {} and min_rows: {}".format( pd.get_option("max_rows"), pd.get_option("min_rows")))
Python
0 vote200 views1 answer
Requirements.txt dev python
Python