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Rob Nagler edited this page Aug 23, 2022 · 3 revisions

in consumes an iterable:

For user-defined classes which do not define __contains__() but do define __iter__(), x in y is True if some value z, for which the expression x is z or x == z is true, is produced while iterating over y.

[private note https://github.com/radiasoft/discuss/issues/14]