Python Dictionaries

This lecture you will learn python Dictionaries!

Dictionaries in Python

Using dictionaries with a bunch of key value pairs, 

These are key value pairs 

Name = test
Email = test@gmail.com
Phone = 23433

 Will see now how to define and use dictionary in Python
 
 Keys would be unique on dictionary 

customer = {
    "name": "krish",
    "age": 22,
    "is_verified": True
}

print(customer["name"])
output:
krish

if we pass the name which is not available in dictionary which will returns key error 
and also we can use get method to get the key value pairs 

print(customer.get("name"))

in this scenario if the key is not available it would be print None says that object is not available.

Updating the dictionary values as well 
customer = {
    "name": "krish",
    "age": 22,
    "is_verified": True
}
customer["name"] = "John"
print(customer["name"])

also add new key value pairs here like
customer["email"] = "john@mail.com"
print(customer["email"])

Exercise:
Print  1234  users phone number in words for an example
phone = input("Phone: ")
mapping = {
    "1": "One",
    "2": "Two",
    "3": "Three",
    "4": "Four"
}
output = ""
for ch in phone:
    output += mapping.get(ch, "!") + " "
print(output)

output:
Phone: 1235
One Two Three !