Question

我正在尝试创建一个列表来计算每个列表列表中的价格数量。

使用以下代码：

print data['OtherBids']

我得到了以下输出：

[[0.074,0.073,0.072,0.03,0.029,0.024,0.021,0.02]，[0.02,0.02,0.015]，[0.026,0.026,0.02,0.02,0.02,0.015]，[0.021,0.021,0.02] ，0.017]，[0.077,0.076,0.074,0.055,0.045,0.021]，[0.053,0.052,0.051,0.023,0.022]，[0.016,0.016]]

基于粗略的数据视图，我们可以看到第一个列表中有8个元素，第二个列表中有3个元素，第3个列表中有6个，依此类推......但是，当我尝试使用while循环生成数据时，它返回以下错误：

data['number'][a] = len(data['OtherBids'][a])
KeyError: 'number'

导致上述错误的代码是：

a = 0
b = len(data['OtherBids'])

while a <= b - 1:
    for i in data['OtherBids']:
        data['number'][a] = len(data['OtherBids'][a]).get
    a = a + 1

有人知道我应该怎么解决它吗？

Answer 1

您的data没有"number"键：

a = 0
b = len(data['OtherBids'])
# add this line
data['number'] = dict()

while a <= b - 1:
    for i in data['OtherBids']:
        # seems to be mistype: len(data['OtherBids'][a]).get
        # I removed .get
        data['number'][a] = len(data['OtherBids'][a])
    a = a + 1

<强> UPD

我发现你的代码太复杂了

更多pythonic版本：

data['number'] = {}
for i, item in enumerate(data['OtherBids']):
    data['number'][i] = len(item)

内联版本：

data['number'] = {i:len(item) for i,item in enumerate(data['OtherBids'])}

尝试使用len（）函数从现有列表创建列表时的KeyError

1 个答案: