Add a variable to a class instance at runtime
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This demonstrates how to dynamically add variables to a class instance at runtime. This is useful when the methods/variables are based on a data file that isn't available until runtime. Hal Fulton gives an example of creating an OO CSV parser at An Exercise in Metaprogramming with Ruby
Python
class empty(object):
pass
e = empty() setattr(e, "foo", 1) print e.foo
Ruby
class Empty end e = Empty.new e.instance_variable_set("@foo", 1) e.instance_eval("class << self; attr_accessor :foo; end") puts e.foo