[] 和 () 的区别

[] 和 () 创建的列表推导式不同

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lst = [i for i in range(4)]
print(lst)
print(type(lst))

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gen = (i for i in range(4))
print(gen)
print(type(gen))

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对 () 创建的对象进行遍历

gen = (i for i in range(4))
for i in gen:
    print(i,end = " ")
print()

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推导式 () 内直接写入的创建的是可迭代对象,需要遍历才能查看值
或者 next(对象) 进行查看,但是指针会对应下移一位.
[] 创建的是列表推导式,可以直接看到值

gen = (i for i in range(4))
print(next(gen))
print(next(gen))

 

 

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2020-05-07