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Mahmoud EL-kariouny
Mahmoud EL-kariouny

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python dictionary methods explanation and visualization

#python #tutorial #programming #beginners

python dictionary methods

get()

  • Returns the value of the specified key 
fruits = {'grape': 'πŸ‡', 'Watermelon': 'πŸ‰', 'banana': '🍌', 'mango': 'πŸ₯­', 'apple': '🍎'}

x = fruits.get("mango")

# output
πŸ₯­
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clear()

  • Removes all the elements from the dictionary 
fruits = {'grape': 'πŸ‡', 'Watermelon': 'πŸ‰', 'banana': '🍌', 'mango': 'πŸ₯­', 'apple': '🍎'}
fruits.clear()

# output
{}
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copy()

  • Returns a copy of the dictionary 
fruits = {'grape': 'πŸ‡', 'Watermelon': 'πŸ‰', 'banana': '🍌', 'mango': 'πŸ₯­', 'apple': '🍎'}

x = fruits.copy()

# output
{'grape': 'πŸ‡', 'Watermelon': 'πŸ‰', 'banana': '🍌', 'mango': 'πŸ₯­', 'apple': '🍎'}
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keys()

  • Returns a list containing the dictionary's keys 
fruits = {'grape': 'πŸ‡', 'Watermelon': 'πŸ‰', 'banana': '🍌', 'mango': 'πŸ₯­', 'apple': '🍎'}

x = fruits.keys()

# output
dict_keys(['grape', 'Watermelon', 'banana', 'mango', 'apple'])
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update()

  • Updates the dictionary with the specified key-value pairs 
fruits = {'grape': 'πŸ‡', 'Watermelon': 'πŸ‰', 'banana': '🍌', 'mango': 'πŸ₯­', 'apple': '🍎'}
fruits.update({"strawberry":"πŸ“"})

# output
{'grape': 'πŸ‡', 'Watermelon': 'πŸ‰', 'banana': '🍌', 'mango': 'πŸ₯­', 'apple': '🍎', 'strawberry': 'πŸ“' }
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values()

  • Returns a list of all the values in the dictionary 
fruits = {'grape': 'πŸ‡', 'Watermelon': 'πŸ‰', 'banana': '🍌', 'mango': 'πŸ₯­', 'apple': '🍎'}
x = fruits.values()

# output
dict_values(['πŸ‡', 'πŸ‰', '🍌', 'πŸ₯­', '🍎'])
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pop()

  • Removes the element with the specified key 
fruits = {'grape': 'πŸ‡', 'Watermelon': 'πŸ‰', 'banana': '🍌', 'mango': 'πŸ₯­', 'apple': '🍎'}
fruits.pop('Watermelon')

# output
{'grape': 'πŸ‡', 'banana': '🍌', 'mango': 'πŸ₯­', 'apple': '🍎'}
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items()

  • Returns a list containing a tuple for each key value pair 
fruits = {'grape': 'πŸ‡', 'Watermelon': 'πŸ‰', 'banana': '🍌', 'mango': 'πŸ₯­', 'apple': '🍎'}
x = fruits.items()

# output
dict_items([('grape', 'πŸ‡'), ('Watermelon', 'πŸ‰'), ('banana', '🍌'), ('mango', 'πŸ₯­'), ('apple', '🍎' )])
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fromkeys()

  • Returns a dictionary with the specified keys and value 
x = ['grape1', 'grape2', 'grape3']
y = 'πŸ‡'

fruits = dict.fromkeys(x, y)

# output
{'grape1': 'πŸ‡', 'grape2': 'πŸ‡', 'grape3': 'πŸ‡'}
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popitem()

  • Removes the last inserted key-value pair 
fruits = {'grape': 'πŸ‡', 'Watermelon': 'πŸ‰', 'banana': '🍌', 'mango': 'πŸ₯­', 'apple': '🍎'}
fruits.popitem()

# output
{'grape': 'πŸ‡', 'Watermelon': 'πŸ‰', 'banana': '🍌', 'mango': 'πŸ₯­'}
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setdefault()

  • Returns the value of the specified key.
  • If the key does not exist: insert the key, with the specified value. 
fruits = {'grape': 'πŸ‡', 'Watermelon': 'πŸ‰', 'banana': '🍌', 'mango': 'πŸ₯­', 'apple': '🍎'}

x = fruits.setdefault("grape", None)

# output
{'grape': 'πŸ‡', 'Watermelon': 'πŸ‰', 'banana': '🍌', 'mango': 'πŸ₯­', 'apple': '🍎'}
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