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Day 7 — Mini Project & Programmer Thinking

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🟢 Day 7 — Mini Project & Programmer Thinking

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1️⃣ Why a Mini Project?

Until now, you learned:
Variables & decisions
Loops
Lists & strings
Functions
Dictionaries
Files & error handling
But in isolation.
💡 Real programs are just small pieces working together.
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2️⃣ The Project: Student Management System

This project is intentionally simple, but real.

What the Program Should Do

Add a student with marks
View all students
Search for a student
Save data to file
Load data from file
Exit safely
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3️⃣ Think Before Coding (MOST IMPORTANT PART)

Before writing any code, answer:

Step 1 — What Data Do We Need?

Student name → string
Student marks → number
Multiple students → dictionary
students = {
"Amit": 85,
"Neha": 90
}
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Step 2 — What Actions Are Needed?

Add student
View students
Search student
Save
Load
Each action → function
🧠 One action = one function
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4️⃣ Program Flow (Mental Diagram)

START
|
|-- Show menu
|-- Take choice
|-- Call correct function
|-- Repeat until exit
END
💡 This is how every menu-driven program works.
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5️⃣ Menu Loop (Core Structure)

while True:
print("1. Add student")
print("2. View students")
print("3. Search student")
print("4. Save & Exit")

choice = input("Enter choice: ")

if choice == "1":
add_student()
elif choice == "2":
view_students()
elif choice == "3":
search_student()
elif choice == "4":
save_to_file()
break
else:
print("Invalid choice")
🧠 This is real-world program structure.
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6️⃣ Key Functions (Skeleton, Not Full Code)

Add Student

def add_student(students):
name = input("Enter name: ")
marks = int(input("Enter marks: "))
students[name] = marks
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View Students

def view_students(students):
for name, marks in students.items():
print(name, marks)
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Search Student

def search_student(students):
name = input("Enter name: ")
if name in students:
print(students[name])
else:
print("Not found")
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7️⃣ Saving & Loading Data

Save to File

with open("students.txt", "w") as file:
for name, marks in students.items():
file.write(name + "," + str(marks) + "\n")
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Load from File

students = {}

try:
with open("students.txt", "r") as file:
for line in file:
name, marks = line.strip().split(",")
students[name] = int(marks)
except:
pass
💡 File becomes your simple database.
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8️⃣ Thinking Like a Programmer (IMPORTANT)

Whenever stuck, ask:
What data do I need?
What steps are required?
Can I break this into functions?
Where can errors occur?
What happens if input is wrong?
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9️⃣ Practice Tasks (Extend the Project)

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Q1

Add update student marks option.
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Q2

Delete a student.
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Q3

Prevent duplicate student names.
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Q4

Show student with highest marks.
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Q5

Validate marks (0–100 only).
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Q6

Store data in file after every change.
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Q7 (Thinking Question)

If program crashes midway, how can data loss be prevented?
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🔑 HINTS (Read Together)

Use if name in students
Use functions for every action
Validate input using try/except
Always think about failure cases
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