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Internal convenience function to ensure arguments are MutableMappings
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rg a. Determine if string is valid identifier.
The purpose of this function is to be used to validate any variables created in
a play to be valid Python identifiers and to not conflict with Python keywords
to prevent unexpected behavior. Since Python 2 and Python 3 differ in what
a valid identifier is, this function unifies the validation so playbooks are
portable between the two. The following changes were made:
* disallow non-ascii characters (Python 3 allows for them as opposed to Python 2)
* True, False and None are reserved keywords (these are reserved keywords
on Python 3 as opposed to Python 2)
:arg ident: A text string of identifier to check. Note: It is callers
responsibility to convert ident to text if it is not already.
Originally posted at http://stackoverflow.com/a/29586366
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