seaborn

2. Dictionary • Dictionaries are used to store data values in key:value pairs. • A dictionary is a collection which is unordered, changeable and does not allow duplicates.Dictionary is mutable. • Dictionaries are written with curly brackets, and have keys and values. • Key should be unique and immutable datatype. • If we try to assign a new value to same key prior value will be deleted and the new one will be stored.

3. Values in the dictionary can be duplicated but key cannot be duplicated. • Key can be any immutable object like integer, float, character, complex,tuple. • Dictionary keys are case sensitive, same name but different cases of Key will be treated distinctly.

4. Creating a dictionary:d={1:100, ’c’:20, (10,20,30):[100,200,300],4:30}print(d)O/P: {1:100, ’c’:20, (10,20,30):[100,200,300],4:30} • Values in the dictionary can be accessed using keys. • Eg:(d[‘c’])O/P:20 • In Python Dictionary, deletion of keys can be done by using the del keyword. Using del keyword, specific values from a dictionary as well as whole dictionary can be deleted. • Eg: del d[1] print(d)O/P:{’c’:20, (10,20,30):[100,200,300],4:30}

5. Dictionary Methods • clear():Removes all the elements from the dictionary • copy():Returns a copy of the dictionary • fromkeys():Returns a dictionary with the specified keys and value • get():Returns the value of the specified key • items():Returns a list containing a tuple for each key value pair • keys():Returns a list containing the dictionary's keys

6. pop():Removes the element with the specified key • popitem():Removes the last inserted key-value pair • setdefault():Returns the value of the specified key. If the key does not exist: insert the key, with the specified value • update():Updates the dictionary with the specified key-value pairs • values():Returns a list of all the values in the dictionary

7. Examples • d = {1:100, 2.3:200, 10+20j:300, 'a': 'Python', (10,20,30):[100,200,300]} print(d.get('a'))O/P: Python • print(d.setdefault('b'))O/P: None • d1 = d.copy()   # shallow copy of dictionaryprint(d1 is d)O/P:False • d={1:100,2.3:200,10+20j:300,'a':'Python',(10,20,30):[100,200,300]}d.pop(1)print(d) O/P:{2.3: 200, (10+20j): 300, 'a': 'Python', (10, 20, 30): [100, 200, 300]}

8. d={1:100,2.3:200,10+20j:300,'a':'Python',(10,20,30):[100,200,300]}d.popitem()print(d)O/P: {1: 100, 2.3: 200, (10+20j): 300, 'a': 'Python'}

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