How to handle exceptions in Python?

Asked by Science Expert27 days ago
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Error handling techniques.
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In Python, exceptions are runtime errors that can disrupt the normal flow of a program. To handle exceptions and prevent your program from crashing, you use **try-except** blocks. This allows you to catch and respond to errors gracefully. Here’s the basic structure: ```python try: # Code that might raise an exception result = 10 / 0 except ZeroDivisionError: # Code to handle the exception print("You can't divide by zero!") ``` In this example, dividing by zero raises a `ZeroDivisionError`, which is caught by the `except` block, allowing the program to continue running without crashing. You can also catch multiple exceptions by specifying them in a tuple: ```python try: value = int(input("Enter a number: ")) result = 10 / value except (ValueError, ZeroDivisionError) as e: print(f"An error occurred: {e}") ``` If you want to execute some code regardless of whether an exception occurs or not, use the `finally` block: ```python try: file = open('data.txt', 'r') data = file.read() except FileNotFoundError: print("File not found.") finally: file.close() ``` Additionally, you can use the `else` block to run code only if no exception was raised: ```python try: num = int(input("Enter a number: ")) except ValueError: print("Invalid input!") else: print(f"You entered {num}") ``` In summary, Python’s exception handling uses `try`, `except`, `else`, and `finally` blocks to manage errors effectively, making your code more robust and user-friendly.
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by James Wilson15 days ago