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lbillingham/class_scope.py

Created January 20, 2017 09:30
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python class scope is odd
Raw
class_scope.py
class Spam(object):
"""
Demo of python class scope
fails
on py 3.5
> `File "class_scope.py", line 20, in <listcomp>`
> `...`
> `NameError: name 'ham_gen_list' is not defined`
on py 2.7
> `File "class_scope.py", line 21, in <genexpr>((i,))`
> `...`
> `NameError: global name 'ham_compre_enum_list' is not defined`
"""
ham = 10
ham_range = range(ham)
ham_list = [x for x in ham_range]
ham_gen_list = list(x for x in ham_list)
ham_compre_enum_list = [ham_gen_list[i] for i in range(ham)]
ham_gen_enum_list = list(ham_compre_enum_list[i] for i in range(ham))
# generators are functions but fail to capture the enclosing scope
# in the same way as named-defined functions
# http://stackoverflow.com/a/13913933/3751373
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