How to Create a Python Exception Message String?

To create a Python exception message string, you can use the str() function to convert an exception object to a string, or you can use the traceback module to format the exception message with additional information. Here are some examples:

# create a division by zero exception
try:
    result = 1/0
except Exception as e:
    # convert the exception object to a string
    message = str(e)
    print(message)

# output: division by zero


import traceback

# create a file not found exception
try:
    with open('nonexistent_file.txt', 'r') as file:
        content = file.read()
except Exception as e:
    # format the exception message with traceback information
    message = traceback.format_exception_only(type(e), e)[-1].strip()
    print(message)

# output: FileNotFoundError: [Errno 2] No such file or directory: 'nonexistent_file.txt'

In the first example, we create a division by zero exception and catch it using a try/except block. We convert the exception object to a string using the str() function and assign it to a variable called message. We then print the message to the console.

In the second example, we create a file not found exception and catch it using a try/except block. We use the traceback module to format the exception message with additional information, including the type of exception and the filename that caused the exception. We assign the formatted message to a variable called message and print it to the console.

Note that there are many ways to format exception messages in Python, and the best approach may depend on your specific needs and use case. The str() function and traceback module are just two examples of how to create exception message strings in Python.