58 - 编写一个生产器，将一个二维列表转换为一维列表

'''
python生成器（迭代）

yield
'''
def myGenerator():
    numList = [1, 2, 3, 4, 5, 6, 7, 8]
    for num in numList:
        yield num

for num in myGenerator():
    print(num, end=' ')

1 2 3 4 5 6 7 8 

'''
[[1,2,3],[2,4,1],[2,4,6]]

[1,2,3,2,4,1,2,4,6]
'''

def enumList(List):
    for subList in List:
        for element in subList:
            yield element
            
List = [[1,2,3],[2,4,1],[2,4,6]]
for num in enumList(List):
    print(num, end=' ')
    
numList = list(enumList(List))
print(type(numList))
print(numList)

1 2 3 2 4 1 2 4 6 <class 'list'>

[1, 2, 3, 2, 4, 1, 2, 4, 6]