__init__() is a dunder. It starts and ends with __, a double underbar, aka: dunder. Change _init_ to __init__.

Code:

class student:
    def __init__(self, name, age):
        self.name = name
        self.age = age

    def display(self):
        return ("this is a " + self.name + str(self.age))

stu = student("chad", 14)
print(stu.display())

Results:

this is a chad14

Python doesn't know that the directory containing your modules (including main.py) is a package, therefore it can't properly locate imports. Create an empty __init__.py file in this directory to mark it as a regular package.

A rule of thumb is to mark all your directories that contain python modules as packages with this method.

There's another type of Python packages that may make your code sometimes work: namespace packages. They don't have to contain an __init__.py file. I recommend to just avoid them, unless you understand exactly what they're for and why you need them. [Doc reference]

For a quick reference, search through the FastAPI documentation for "project file structure" (it may be called something similar).

You installed Django for python 3. When you type python in the terminal you opening python 2.7(you can see that in terminal), so try python3 instead.

From your comment - [Errno 1] Operation not permitted

When running a Python script that uses Scapy, or just running Scapy from terminal, if you want to send packets over the wire, you need to call it with root or administrative rights.

So using the terminal -

# Works, but won't be able to send or receive packets.
rypeck@laptop:~$ scapy
>>> 
KeyboardInterrupt
>>> 

# Will work!
rypeck@laptop:~$ sudo scapy
Welcome to Scapy (2.2.0)
>>> 

Scripts you call using sudo python.