Python Error Handling and Exceptions
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Python Error Handling and Exceptions
Errors are an inevitable part of programming, and Python provides a robust system to handle them through exceptions. Understanding error handling is crucial to building reliable and user-friendly applications.
In Python, an exception is an event that disrupts the normal flow of a program. Common exceptions include ZeroDivisionError, ValueError, TypeError, and FileNotFoundError. If not handled, these will cause the program to crash.
To manage exceptions, Python uses try, except, else, and finally blocks:
python
try:
result = 10 / 0
except ZeroDivisionError:
print("You can't divide by zero!")
else:
print("Division successful!")
finally:
print("This block always runs.")
try: Code that might raise an exception.
except: Handles the error if one occurs.
else: Runs if no exceptions occur.
finally: Executes no matter what, often used for cleanup.
You can also catch multiple exceptions or use a generic except clause. However, it’s better to handle specific exceptions to avoid hiding bugs.
Custom exceptions can be defined by inheriting from the Exception class, allowing more control:
python
class MyError(Exception):
pass
Effective error handling makes your code more robust, readable, and easier to debug. Embrace it early in your Python journey to write cleaner and safer programs.
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