Oppiskele Error Handling in Automation Scripts | Automation Fundamentals for DevOps

Error handling is a critical aspect of writing reliable automation scripts for DevOps. In large-scale environments, scripts often interact with files, services, and external systems that can fail or behave unexpectedly. Without proper error handling, a script might crash, leave resources in an inconsistent state, or fail silently—causing confusion and delays. By anticipating possible errors and managing them gracefully, you ensure that your automation is robust, predictable, and easier to maintain. This is especially important in DevOps, where automation underpins deployment, monitoring, and remediation tasks.


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# Attempting to open a file that does not exist and handling the exception

try:
    with open("important_config.txt", "r") as config_file:
        config = config_file.read()
        print("Config loaded successfully.")
except FileNotFoundError as e:
    print("Error: The configuration file was not found.")
    print(f"Details: {e}")

The core tool for error handling in Python is the try-except block. You place code that might fail inside the try block. If an error occurs, Python stops executing the try block and jumps to the matching except block. This allows you to control what happens when something goes wrong, such as logging an error, retrying the operation, or cleaning up resources. For best practices, always provide clear and actionable error messages that help identify the problem and its context. Avoid catching all exceptions unless absolutely necessary; instead, handle only the specific errors you expect. This keeps your scripts predictable and easier to debug.


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# Handling multiple exception types in an automation script

try:
    with open("settings.yaml", "r") as settings:
        data = settings.read()
        print("Settings loaded.")
    value = int("not_a_number")
except FileNotFoundError:
    print("Error: The settings file is missing.")
except ValueError:
    print("Error: Failed to convert data to integer.")
except Exception as e:
    print(f"An unexpected error occurred: {e}")

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              123456789
            
# Attempting to open a file that does not exist and handling the exception

try:
    with open("important_config.txt", "r") as config_file:
        config = config_file.read()
        print("Config loaded successfully.")
except FileNotFoundError as e:
    print("Error: The configuration file was not found.")
    print(f"Details: {e}")


              12345678910111213
            
# Handling multiple exception types in an automation script

try:
    with open("settings.yaml", "r") as settings:
        data = settings.read()
        print("Settings loaded.")
    value = int("not_a_number")
except FileNotFoundError:
    print("Error: The settings file is missing.")
except ValueError:
    print("Error: Failed to convert data to integer.")
except Exception as e:
    print(f"An unexpected error occurred: {e}")

Oliko kaikki selvää?

Kiitos palautteestasi!

Osio 1. Luku 7

Error Handling in Automation Scripts

1. What is the purpose of a try-except block?

2. How does error handling improve automation reliability?

3. What should you include in an error message for DevOps scripts?

Error Handling in Automation Scripts

1. What is the purpose of a try-except block?

2. How does error handling improve automation reliability?

3. What should you include in an error message for DevOps scripts?