Python NameError：名称'N'未定义[重复]

由 发布于 pythonpython-3.x
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为什么在使用类变量时Python（3.8）会抛出NameError？以下工作正常，

class Tester(object):
    # Number of measurements
    N = 6
    temp = [ 0. for x in range(N) ]

但是，当我尝试如下使用它时，它给出了NameError。

class Tester(object):
    # Number of measurements
    N = 6
    temp = [[ 0. for x in range(N) ] for y in range(N) ]

It seems to be happening for the first N. So something like temp = [[ 0. for x in range(6) ] for y in range(N) ] works fine.

When I replace N by Tester.N, it gives NameError for Tester, which makes sense since the class is not defined.

如何定义二维列表的温度？

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3、2、1
3、2、1

我不确定为什么您的方法行不通。如果将其添加到init中，它将起作用：

class Tester(object):

    def __init__(self):
        # Number of measurements
        N = 6
        temp = [[ 0. for x in range(N) ] for y in range(N) ]
        print(temp)

tester = Tester()
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