Naming rules
Syntax: (underscore or letter) + (any number of digits or
underscores)
_rick is a good name
2_rick is not
Case sensitive
Rick is different from rick
Reserved words:
and, assert, break, class, continue, def, del, elif,
else, except, exec, finally, for, from, global, if,
import, in, is, lambda, not, or, pass, print,
raise, return, try, while
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