generator expressions python

1>>> listcomp = ['Hello' for i in range(3)]
2>>> genexpr = ('Hello' for i in range(3))
3

1>>> genexpr = ('Hello' for i in range(3))
2>>> list(genexpr)
3['Hello', 'Hello', 'Hello']
4

1>>> iterator = ('Hello' for i in range(3))
2>>> for x in iterator:
3...     print(x)
4'Hello'
5'Hello'
6'Hello'
7

1def generator():
2    for item in collection:
3        yield expression
4

1>>> for x in even_squares:
2...     print(x)
30
44
516
636
764
8