[PYTHON] generator

Unlike a normal function, it seems to remember the value returned last time. When called, it returns the following value:

generator.py

def counter(num=10):
    for _ in range(num):
        yield 'run'

def greeting():
        yield 'good morning'
        yield 'good afternoon'
        yield 'good night'

for g in greeting():
    print(g)

g=greeting()
print(next(g)) #good morning
print(next(g)) #good afternoon

c=counter()
print(next(c))
print(next(c))
print(next(c))
print(next(c))
print(next(c))
print(next(c))
print(next(c))
print(next(c))
print(next(c))
print(next(c))
#print(next(c))I get an error

output:

good morning
good afternoon
good night
good morning
good afternoon
run
run
run
run
run
run
run
run
run
run