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What is the difference between "try" and "except" in Python?

In Python, the try and except blocks are used for error handling and exception handling. They have the following key differences:

Error Handling:

  • try: The try block is used to enclose the code that may potentially raise an exception. It allows you to test a block of code for potential exceptions.
  • except: The except block is used to specify the code that should be executed if a specific exception is raised within the corresponding try block.

Execution Flow:

  • try: If an exception occurs within the try block, the execution of the block is immediately stopped, and the control flow jumps to the corresponding except block (if one matches the raised exception). If no exception is raised, the except block is skipped entirely.
  • except: The except block is executed only if an exception matching the specified exception type is raised within the corresponding try block. If the exception raised does not match any of the specified exception types, the except block is skipped.

Here's an example to illustrate the difference between try and except:

try:
    x = int(input("Enter a number: "))
    result = 10 / x
    print("Result:", result)
except ZeroDivisionError:
    print("Cannot divide by zero")
except ValueError:
    print("Invalid input. Please enter a number.")

In this example, the code within the try block attempts to divide 10 by the user-provided input number (x). If the user enters a valid number, the division is performed, and the result is printed. However, if the user enters 0 as the input, a ZeroDivisionError is raised, and the code jumps to the corresponding except ZeroDivisionError block, printing the "Cannot divide by zero" message. If the user enters a non-numeric value, a ValueError is raised, and the code jumps to the corresponding except ValueError block, printing the "Invalid input. Please enter a number." message.

The try-except mechanism allows you to handle potential exceptions gracefully and control the program flow in case of exceptions. It enables you to catch specific exceptions and take appropriate actions based on the type of exception raised.

It's worth noting that you can also include a more general except block without specifying a particular exception type to handle any exception that is not caught by the preceding except blocks. Additionally, you can use the else and finally blocks in conjunction with try-except for more advanced exception handling scenarios.

In summary, the try block is used to enclose the code that may raise an exception, and the except block is used to handle specific exceptions raised within the try block.

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