In which cases does an exception occur in Python, and how to determine its location?

An exception in Python occurs when an error happens during program execution that the interpreter cannot handle in the usual way. For example, division by zero, accessing a non-existent list element, input/output errors, etc.

To determine the location of the exception, Python outputs a traceback, which shows the chain of function calls that led to the error and indicates the file, line, and specific code where the exception occurred.

Example:

def divide(a, b):
    return a / b

print(divide(10, 0))

When run, it will produce an error:

Traceback (most recent call last):
  File "example.py", line 5, in <module>
    print(divide(10, 0))
  File "example.py", line 2, in divide
    return a / b
ZeroDivisionError: division by zero

Here, it is visible that the ZeroDivisionError occurred in the divide function on line 2, called from line 5 in the file example.py.

Thus, to locate the exception, you should look at the traceback output, which helps quickly find the source of the error.