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How to catch ‘COMException’ in Python

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How to catch 'COMException' in Python
martin.montpetit
martin.montpetit Teacher

I’m having some trouble with my Python code for sending emails using SMTP. The problem is occurring when I try to catch a specific error, com_error. I’ve tried using a try-except block and also the except method, but I just can’t get the code to accept the com_error. Can anyone help me out?
Here is the relevant part of my code:
try:
server = smtplib.SMTP(smtp_server)
server.sendmail(sender_email, receiver_email, message)
except com_error:
print("Error occurred")
finally:
server.quit()

I get the following error message: “NameError: name ‘com_error’ is not defined”. I don’t know what to do since I’ve imported the required modules and just don’t know what I am missing. Can someone please help me? Any suggestions would be appreciated!
Additionally, is there a better way to catch this error? I want to make sure that no matter what, my code does not break when faced with this error. Thank you in advance for your help!

comerrordebuggingerror handlingexceptionspython
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    ondra_sutner Teacher
    2022-08-09T04:19:52+00:00Added an answer about 7 months ago

    Hello! I’m glad to help you with your coding issue. Based on your question, you are trying to except a COM error in Python. First off, what is a COM error? COM stands for Component Object Model, which is a Microsoft technology used to enable interprocess communication and dynamic object creation. A COM error typically occurs when there is a problem with the communication between two COM components. This error can happen when using Python with COM objects, which is why you are seeing this issue.
    To handle a COM error in Python, you can use a try-except block. This block allows you to catch and handle any exceptions that occur within the block of code you specify. In your case, you want to handle the COM error that your Python code is generating. Here’s an example of how you can use the try-except block to catch the COM error in your Python code:
    “`
    import win32com.client
    try:
    # Your code that uses COM objects here
    except Exception as e:
    print(‘COM Error:’, e)
    “`
    In this example, we import the `win32com.client` module so that we can use COM objects in our Python code. Then, we wrap our code that uses COM objects in a try-except block. If an exception occurs within the try block, Python will execute the code in the except block instead. In this case, we catch and print the COM error that occurred.
    There are a few things to note about this example. First, we use `Exception as e` in the except block to catch all exceptions, not just COM errors. If you know what specific error your code is generating, you can replace `Exception` with that error. Second, you can handle the exception in any way you like within the except block. You could log the error, display an error message to the user, or simply ignore the error and continue running the program.
    It’s also worth noting that you can use the `pythoncom` module in Python to get more detailed information about the COM error. This module provides a function called `PyRecordError` that records the last COM error that occurred. You can then use the properties of this error object to get more information about the error. Here’s an example of how you can use `pythoncom` to get more information about a COM error:
    “`
    import win32com.client
    import pythoncom
    try:
    # Your code that uses COM objects here
    except pythoncom.com_error as e:
    print(‘COM Error:’, e)
    print(‘COM Error Details:’)
    print(‘Error Code:’, hex(e.hresult))
    print(‘Error Message:’, e.strerror)
    “`
    In this example, we first import the `pythoncom` module along with `win32com.client`. Then, we wrap our code in a try-except block and specifically catch `pythoncom.com_error`, which is the type of error that is raised when a COM error occurs. We then print the error message along with some additional details about the error, including the error code and error message.
    I hope this helps you handle the COM errors in your Python code! Let me know if you have any further questions or issues.

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  2. naestinia_bitchez Teacher
    2022-08-27T09:14:37+00:00Added an answer about 7 months ago

    You can catch a COM error in Python by using a try-except block. This allows you to handle the error and execute code specific to the error. You may want to use the win32api to handle the error, which is a Python module that provides access to many of the main features of the Windows API.

    For example, you can use this code to catch a COM error:

    “`
    import pythoncom

    try:
    # Your code here
    except pythoncom.com_error:
    # Code to handle the COM error
    “`

    In the try block, you should include the code that may raise a COM error. In the except block, you can handle the COM error by writing code specific to the error. The pythoncom.com_error exception will be raised whenever a COM error occurs.

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