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Given a dictionary like so:
my_map = {'a': 1, 'b': 2} How can one invert this map to get:
inv_map = {1: 'a', 2: 'b'} 
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1) Using OrderedDict() and items() method Later you make use of a reversed() function which is an in-built python method that takes an argument as the sequence data types like tuple, lists, dictionaries, etc and returns the reverse of it. Remember that reversed() method does not modify the original iterator.
Use items() to Reverse a Dictionary in Python Reverse the key-value pairs by looping the result of items() and switching the key and the value. The k and v in the for loop stands for key and value respectively.
The items() method returns a view object that displays a list of dictionary's (key, value) tuple pairs.
Python 3+:
inv_map = {v: k for k, v in my_map.items()} Python 2:
inv_map = {v: k for k, v in my_map.iteritems()} If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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