def a_generator_func():
    print("about to yield first value")
    yield "first value"
    print("just yielded first value")
 
    print("about to yield second value")
    yield "second_value"
    print("done yielding, there is no third value")
 
 
a_generator = a_generator_func()
 
print("About to get first value")
print("The first value is", next(a_generator))
print("About to get second value")
print("The second value is", next(a_generator))
try:
    print("About to get third value")
    print("The third value is", next(a_generator))
except StopIteration:
    print("The generator ended")
 
# for elem in a_generator_func():
#     print(elem)

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