Dictionary Cheatsheet

ex: my_dict = {'name': 'John', 'age': 25, 'city': 'New York'}

1. .clear(): Removes all items from the dictionary. my_dict.clear() # {}

2. .copy(): Creates a copy of a dictionary new_dict=my_dict.copy() #{'name':'John', 'age':25, 'city':'New York'}

3. .get(): Returns the value of a particular key. my_dict.get('age') # 25

4. .items(): Returns all the items preent int he dictionary as (key,value) pairs. my_dict.items() # (name,john), (age,25),(city,New York)

5. .keys(): Returns a list of keys in a dictionary my_dict.keys() # [name,age,city]

6. .values(): Returns a list of values in a dictionary. my_dict.values() # [john,25,new york]

7. .pop(key): Removes the key value pair from the dictionary. my_dict.pop('age') # {'name': 'John', 'city': 'New York'}

8. .popitem(): Removes the last key value pair from the dictionary. my_dict.popitem() # {'name': 'John', 'age': 25}

9. .upate(): Updates a dictionary by adding the items from another dictionary. new_dict={'country':'USA','mob_num':12345} my_dict.update(new_dict) # {'name': 'John', 'age': 25, 'city': ' New York','country':'USA','mob_num':12345}

10. .setdefault(key,value):Returns the value for a key if it exists. If not, inserts the key with a value of default and returns default. my_dict.setdefault('age', 30) # {'name': 'John', 'age': 25, 'city': 'New York'} my_dict.setdefault('height', 175) # {'name': 'John', 'age': 25, 'city': 'New York','height',175}

11. .fromkeys():Creates a new dictionary with keys from iterable and values set to value. new_dict =dict.fromkeys(['a', 'b', 'c'], 0) # {'a': 0, 'b': 0, 'c': 0}