`\',\'` or `\'as\'`? How to Assign Exceptions in Python\'s `except` Statements

Comparing ',' and 'as' in Python's except Statements

Python's try...except syntax allows for handling exceptions. However, there are two ways of assigning an exception to a variable: using a comma (',') or the 'as' keyword.

',' vs 'as' in except

In Python 3.x, using 'as' is mandatory for assigning an exception to a variable:

<code class="python">try:
    pass
except Exception as exception:
    pass</code>

In Python 2.6 (including later versions), using the 'as' syntax is strongly recommended. It is more unambiguous and provides forward compatibility with Python 3.x:

<code class="python">try:
    pass
except Exception as exception:
    pass</code>

However, in Python 2.5 and earlier, only the comma version is supported:

<code class="python">try:
    pass
except Exception, exception:
    pass</code>

Which Syntax to Use

Based on the compatibility matrix:

Python Version

Comma Syntax

'as' Syntax

2.5 and earlier

Python Version	Comma Syntax	'as' Syntax
2.5 and earlier	Supported	Not supported
2.6	Supported but not recommended	Recommended
3.x	Not supported	Mandatory

Supported

Not supported

2.6

Supported but not recommended

Recommended

3.x

Not supported

Mandatory

For maximum compatibility and clarity, it is generally recommended to use the 'as' syntax in Python 2.6 and above. For earlier versions of Python, the comma syntax is the only option.

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