Working with dictionaries in Python

In this article we will look at OrderedDict and Counter

Use an OrderedDict to sort an existing dictionary such as the one below:

dict = {'bob': 340, 'jim': 939,
        'sid': 152, 'baz': 27, 'foo': 32}

How to sort a Python dictionary

Enclose the dictionary with OrderedDict(sorted(dict.items())

Note: you can also add in “reverse” if you want the opposite sort order:

dict1 = OrderedDict(sorted(dict.items(), reverse=True))
print(dict1)

How to remove a key:value pair from a Python Dictionary

To remove a key value pair use pop – this will work even if the key value pair you pass to pop is absent:

How to add a new key:value pair

Add a new key value pair in a Python dictionary:

How to rename a key

Rename a key in a Python dictionary:

Capitalise each key in a dictionary:

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OrderedDict

# Create sorted dictionary (sorted by key)

dict = {'bob': 340, 'jim': 939,
        'sid': 152, 'baz': 27, 'foo': 32}

dict1 = OrderedDict(sorted(dict.items(), reverse=True))
print(dict1)

# remove a key/value pair from dictionary
dict1.pop('bob', None)
print(dict1)

# add a new key pair
dict1["Moo"] = 33

# rename a key (keeps the value)
dict1["Jimmy"] = dict1.pop('jim')
print(dict1)

# capitalize each key
result = {}
for key, value in dict1.items():
    result[key.title()] = value
print(result)

# if the value is odd, add 1
for k, v in dict1.items():
    if dict1[k] %2 ==1:
        dict1[k]+=1    
print(dict1)

Counter

from collections import Counter

ls = ['a','b','b','c','c','c']

from collections import Counter

Counter(ls)
Counter({'a': 1, 'b': 2, 'c': 3})

Working with dictionaries : Video

Check out the code to extract “.co.uk” email address values from JSON and test the functions using pytest and the fixtures decorator.