成功解决Python的ValueError: The truth value of an array with more than one element is ambiguous
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2022-05-27 12:49:58
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报错
ValueError: The truth value of an array with more than one element is ambiguous. Use a.any() or a.all()
错误原因
比较的两个变量不在同一维度上。比如类型是<class ‘numpy.ndarray’> 和 浮点数没有办法比较。
'''
enumerate() 函数用于将一个可遍历的数据对象(如列表、元组或字符串)组合为一个索引序列,
同时列出数据和数据下标,一般用在 for 循环当中。
enumerate(sequence, [start=0])
sequence -- 一个序列、迭代器或其他支持迭代对象。
start -- 下标起始位置
'''
>>>seasons = ['Spring', 'Summer', 'Fall', 'Winter']
>>> list(enumerate(seasons))
[(0, 'Spring'), (1, 'Summer'), (2, 'Fall'), (3, 'Winter')]
>>> list(enumerate(seasons, start=1)) # 下标从 1 开始
[(1, 'Spring'), (2, 'Summer'), (3, 'Fall'), (4, 'Winter')]
轴用来为超过一维的数组定义的属性,二维数据拥有两个轴:第0轴沿着行的垂直往下,第1轴沿着列的方向水平延伸
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