Using Classes Across Files (Modules)

Why Do We Need It?

In real projects, all classes are not written in a single file.

We separate classes into different files to keep code organized and reusable.

---

student.py

class Student:

    def __init__(self, name):
        self.name = name

    def show(self):
        print(self.name)

---

main.py

from student import Student

s1 = Student("John")

s1.show()

Output:

John

---

How It Works

Python reads:

from student import Student

Meaning:

• Open the file student.py
• Find the class Student
• Make it available in the current file

Now we can create objects normally.

---

Visual Representation

student.py
│
└── Student Class
         │
         ▼
main.py
│
├── import Student
│
└── create object

---

Rule to Remember

One file can contain classes.

Other files can import and use those classes.