Python 3.5+collectionsterm

collections.abc.Generator

collections.abc — protocols

The generator protocol: an iterator with send/throw/close.

Syntax

isinstance(obj, collections.abc.Generator)

A real generator passes — a function with yield or a generator expression — and so does any class that also defines send, throw and close; your own class with just __iter__ and __next__ registers as an Iterator but not as a Generator, since send, throw and close are required too. When you only mean "lazy one-shot iteration", check Iterator instead. And remember the trap generators themselves carry: once fully consumed, the object is spent, and a second loop over it silently yields nothing.

Examples

import collections.abc as abc
def g():
    yield 1
print(isinstance(g(), abc.Generator))   # → True

See also

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