Hello: Many times, people are warning things like "Don't use 'str' as a variable name as it will shadow the built in str function." Is there some way to determine if a string is already defined in some higher scope? Maybe something like <code>
if isdefined ('str'):
print 'str is already defined, please choose another name'
</code>
If not, would it be easy to write this?
Thanks in advance:
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