🟢 Beginner · Lesson 14

Dictionaries in Python

Python Dictionaries

What are Dictionaries in Python?

Dictionaries in Python means a dictionary stores data in key-value pairs. It is useful for records, JSON-like data and fast lookups.

In real programs, this topic helps in storing student records. Learn the idea first, then type the program yourself and compare the output.

💡 At a Glance

Point	Details
Course Area	Core Python Basic programming concepts used to write Python programs.
Main Use	storing student records
Example File	`dictionaries.py`
Practice Focus	Run, change values, and explain the output line by line.

Why should you learn this?

It is useful for storing student records.
It connects with working with JSON-like data.
It improves your ability to read, write and debug Python programs.

Important Terms

These terms are used directly in this lesson. Understand them before memorising the code.

Term	Meaning
key	Identifier used to access a value in a dictionary.
value	Data stored against a key in a dictionary.
dict	Dictionary data type used for key-value records.
get()	Dictionary method that safely returns a value or default.
items()	Dictionary method that returns key-value pairs.

Syntax / Basic Pattern

The simple pattern is: prepare data, apply the concept, then show the result.

Basic Pattern

student = {
    "name": "Anaya",
    "class": "XI",
    "marks": 92
}
print(student["name"])
print(student.get("section", "Not assigned"))
for key, value in student.items():

Complete Example Program

Python – dictionaries.py

student = {
    "name": "Anaya",
    "class": "XI",
    "marks": 92
}

print(student["name"])
print(student.get("section", "Not assigned"))

for key, value in student.items():
    print(key, "=>", value)

Expected Output

Anaya Not assigned name => Anaya class => XI marks => 92

Program Explanation

student = { stores a value in student.
"name": "Anaya", performs the next step of the program logic.
"class": "XI", performs the next step of the program logic.
"marks": 92 performs the next step of the program logic.
} performs the next step of the program logic.
print(student["name"]) displays information or calculated result on the screen.
print(student.get("section", "Not assigned")) displays information or calculated result on the screen.

Where will you use it?

Storing student records.
Working with json-like data.
Finding values by key quickly.

Common Mistakes

Writing code with wrong indentation.
Using input() value directly in calculations without converting it to int or float.
Using unclear variable names that make the program difficult to understand.

Practice Tasks

Type the program in dictionaries.py and run it.
Change input values or sample data and observe the new output.
Create one example related to storing student records.
Write 5 lines explaining the logic in your own words.

Summary

Dictionaries in Python is not a theory-only topic. You should be able to explain the meaning, write the example, run it successfully, and use it in a small practical program.

Python Dictionaries क्या है?

Python Dictionaries ka matlab hai: A dictionary stores data in key-value pairs. It is useful for records, JSON-like data and fast lookups. Simple words me, ye topic practical Python programs likhne me direct use hota hai.

Is topic ko sirf definition ke liye nahi, balki storing student records jaise real examples ke liye practice karein.

यह क्यों सीखना जरूरी है?

Ye storing student records me kaam aata hai.
Ye working with JSON-like data se bhi connected hai.
Isse aap code ka output aur errors better samajh paate hain.

Important Terms

Term	Meaning
key	Identifier used to access a value in a dictionary.
value	Data stored against a key in a dictionary.
dict	Dictionary data type used for key-value records.
get()	Dictionary method that safely returns a value or default.
items()	Dictionary method that returns key-value pairs.

Syntax / Basic Pattern

Basic idea: pehle data तैयार करें, phir Python logic apply करें, aur finally result display करें.

Basic Pattern

student = {
    "name": "Anaya",
    "class": "XI",
    "marks": 92
}
print(student["name"])
print(student.get("section", "Not assigned"))
for key, value in student.items():

Complete Example Program

Python – dictionaries.py

student = {
    "name": "Anaya",
    "class": "XI",
    "marks": 92
}

print(student["name"])
print(student.get("section", "Not assigned"))

for key, value in student.items():
    print(key, "=>", value)

Expected Output

Anaya Not assigned name => Anaya class => XI marks => 92

Program Explanation

student = { stores a value in student.
"name": "Anaya", performs the next step of the program logic.
"class": "XI", performs the next step of the program logic.
"marks": 92 performs the next step of the program logic.
} performs the next step of the program logic.
print(student["name"]) displays information or calculated result on the screen.
print(student.get("section", "Not assigned")) displays information or calculated result on the screen.

Practical Uses

Storing student records.
Working with json-like data.
Finding values by key quickly.

Common Mistakes

Writing code with wrong indentation.
Using input() value directly in calculations without converting it to int or float.
Using unclear variable names that make the program difficult to understand.

Practice Tasks

Program ko dictionaries.py file me type karke run karein.
Values change karke output compare karein.
storing student records par ek छोटा example banayen.
Logic ko apne words me 5 lines me likhein.

सारांश

Dictionaries in Python ko tab complete maanenge jab aap iska meaning, example, output aur practical use clearly explain kar saken.

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