如何将[i for i in range(20)]变成产生器
a = [i for i in range(10)]
print(a)
print(type(a))
# <class 'list'>
b = (i for i in range(10))
print(b)
print(type(b))
# <generator object <genexpr> at 0x0000017EFE3DA548>
# <class 'generator'>
for i in a:
print(i)
for i in b:
print(i)
x = (1,2,3,4)
print(type(x))
# <class 'tuple'>
如果列表是通过for循环产生的，只需要将方括号变成圆括号，就会将列表变成一个产生器
