Python Dictionaries

Dictionaries are collections with "left and right side", or, "key and value pairs".

Basically keys, (left) describe data on right (value) side.

Dictionaries are created with curly brackets:

dba = {"Name" : "Anastasia", "SSN" : 123456}

print(dba)

Result: 

{'Name': 'Anastasia', 'SSN': 123456}
>>> 

We will get values using keys:

dba = {"Name" : "Anastasia", "SSN" : 123456}

print(dba["Name"])
print(dba["SSN"])

Result: 

Anastasia
123456
>>> 

Small reports/explanations are easy:

dba = {"Name" : "Anastasia", "SSN" : 123456}

print("Name: ", dba["Name"])
print("SSN: ", dba["SSN"])

Result: 

Name:  Anastasia
SSN:  123456
>>> 

Simple one-line extraction:

dba = {"Name" : "Anastasia", "SSN" : 123456}

print(dba["Name"], " -> ", dba["SSN"])

Result: 

Anastasia  ->  123456
>>> 

Dictionaries are not "fixed in time", to change values - target keys first:

dba = {"Name" : "Anastasia", "SSN" : 123456}

dba["Name"] = "Michael"
dba["SSN"] = 555444

print(dba)

Result: 

{'Name': 'Michael', 'SSN': 555444}
>>> 

If you like parentheses more than brackets, use get() function:

dba = {"Name" : "Anastasia", "SSN" : 123456}

print(dba.get("Name"))

Result: 

Anastasia
>>> 

We will talk about Dictionary Operations more in next tutorial.