Python Dictionary

Agenda:

1. Python Dictionary

2. Ex: Keys and Values

3. Python Methods

4. Dictionary Example Program

1. Python Dictionary

A python dictionary is a collection of unordered, changeable and

indexed.

It has defined by curly braces {}

It has keys and values.

2. Example: Keys and Values

My_dict={1:’python’,2:’programming’}

         ↓               ↓

        Key             Value

Dictionary is not allows duplicate keys.

3.Dictionary Methods

Accessing

Mydict={1:’a’,2:’b’} --> mydict[1]--> 2

Len()

Len() function is used to find the length of the dictionary

mydict={1:’a’,2:’b’}--> len(mydict) --> 2 

Key()

Key() is used to shows the keys in the dictionary.

mydict={1:’a’,2:’b’}--> mydict.key()-->[1,2]

Values()

Values () function is used to shows the values of the dictionary.

mydict={1:’a’,2:’b’} --> mydict.values() --> [‘a’,’b’]

Dictionary Example Program

# Dictionary
Mydict={1:'python',2:'programming'}
print("Mydict=",Mydict,"This Integer keys")
Mydict1={'First name': 'Hemarangan', 'Last name':"S"}
print(Mydict1)
Mydict2={'Welcome':'HRS',2:[2,4,6]}
print("Mixed Keys",Mydict2)
print("Dictionary not allows duplicate keys")
# Dictionary not allows duplicate keys
print("Before")
Mydict={1:'python',2:'programming'}
print(Mydict)
print("After")
Mydict={1:'python',2:'programming',2:"hello"}
print(Mydict)
#Dictionary Methods
print("Let's move the Dictionary Methods")
print(Mydict)
print(Mydict[2])
print(len(Mydict))
print(Mydict.keys())
print(Mydict.values())

Output

Mydict= {1: 'python', 2: 'programming'} This Integer keys
{'First name': 'Hemarangan', 'Last name': 'S'}
Mixed Keys {'Welcome': 'HRS', 2: [2, 4, 6]}
Dictionary not allows duplicate keys
Before
{1: 'python', 2: 'programming'}
After
{1: 'python', 2: 'hello'}
Let's move the Dictionary Methods
{1: 'python', 2: 'hello'}
hello
2
dict_keys([1, 2])
dict_values(['python', 'hello'])

Process finished with exit code 0

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