In this tutorial we are going to learn :
- Dictionaries In Python
- Creating Items and Accessing Items
- Change Dictionary Items
- Checking Items and Getting Lenght
Dictionaries in Python
Dictionary is an unordered, changeable, and indexed collection of items.
- Dictionaries have key and value.
- They are written with curly brackets
Creating Items and Accessing Items
We use curly brackets to create a dictionary.
- We also use the dict() method to create a dictionary.
- To access items in a dictionary, you can use the get() method.
Example :
# creating dictionary
first_dictionary = {
"name": "James"
"age": 21
}
3 we can also use dict() method to create dictionary
second_dictionary = dict(name = "John", age = 21)
print(first_dictionary)
print(second_dictionary)
# we use get() method to access items
print(first_dictionary.get("name"))
print(second_dictionary.get("name")) 
Change Dictionary Items
We can also change the value of a specific item by referring to its key name.
Example :
# change items
my_dictionary = dict(name = "Adam", age = 21)
print(my_dictionary)
#changing item
my_dictionary["name"] = "John"
print(my_dictionary)
# we can also add a new key
my_dictionary["city"] = "New York"
print(my_dictionary) 
Checking Items and Getting Lenght
We can use the in keyword to learn if the item exists in dictionary.
To get length of a dictionary , you can use the len() method.
Example :
my_dictionary = dict(name = "James", age = 21)
if "name" in my_dictionary:
print("exist")
# getting lenght
print("Lenght :", len(my_dictionary)) 
