What are Exceptions?
Understanding Exceptions in Python
When you write Python code, you expect each instruction to follow the previous one in order. However, sometimes something unexpected happens that interrupts this normal flow. This interruption is called an exception.
Exceptions are events that occur during program execution when Python encounters a problem it cannot handle automatically. These problems might be caused by invalid operations, missing files, or incorrect data. When an exception occurs, Python immediately stops running the current block of code and begins searching for instructions to handle the situation. If you do not provide a way to handle the exception, Python will stop your program and display an error message.
Common causes of exceptions include:
- Dividing by zero;
- Trying to open a file that does not exist;
- Accessing an invalid index in a list;
- Using data of the wrong type.
Understanding exceptions is essential for writing reliable Python programs. By anticipating and handling exceptions, you can prevent your program from crashing and provide helpful feedback to users.
12345# This program will raise a ZeroDivisionError numerator = 10 denominator = 0 result = numerator / denominator print("Result:", result)
ZeroDivisionError Example and Exception Reporting
In the code above, Python tries to divide numerator by denominator. Since the denominator is zero, this operation is not mathematically possible. Python responds by raising a ZeroDivisionError exception. When you run this code, Python displays a message like ZeroDivisionError: division by zero. This message explains the type of exception and the reason it occurred. Exceptions like this are different from syntax errors, which happen when the code is not written correctly. Exceptions occur even when your code is syntactically correct but encounters a problem during execution.
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Understanding Exceptions in Python
When you write Python code, you expect each instruction to follow the previous one in order. However, sometimes something unexpected happens that interrupts this normal flow. This interruption is called an exception.
Exceptions are events that occur during program execution when Python encounters a problem it cannot handle automatically. These problems might be caused by invalid operations, missing files, or incorrect data. When an exception occurs, Python immediately stops running the current block of code and begins searching for instructions to handle the situation. If you do not provide a way to handle the exception, Python will stop your program and display an error message.
Common causes of exceptions include:
- Dividing by zero;
- Trying to open a file that does not exist;
- Accessing an invalid index in a list;
- Using data of the wrong type.
Understanding exceptions is essential for writing reliable Python programs. By anticipating and handling exceptions, you can prevent your program from crashing and provide helpful feedback to users.
12345# This program will raise a ZeroDivisionError numerator = 10 denominator = 0 result = numerator / denominator print("Result:", result)
ZeroDivisionError Example and Exception Reporting
In the code above, Python tries to divide numerator by denominator. Since the denominator is zero, this operation is not mathematically possible. Python responds by raising a ZeroDivisionError exception. When you run this code, Python displays a message like ZeroDivisionError: division by zero. This message explains the type of exception and the reason it occurred. Exceptions like this are different from syntax errors, which happen when the code is not written correctly. Exceptions occur even when your code is syntactically correct but encounters a problem during execution.
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