Python '；非类型'；列中的对象

我使用数组并将行命名为列[1]中的元素

free.index = free[1]
free

下一步，我想删除列[1]

free = free.drop(1, axis=1, inplace=True)
free

结果是

AttributeError                            Traceback (most recent call last)
<ipython-input-24-1a43fda6165c> in <module>
----> 1 free = free.drop(1, axis=1, inplace=True)
      2 free
AttributeError: 'NoneType' object has no attribute 'drop'

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如何避免错误

您得到的是AttributeError:'NoneType'对象没有属性'drop'，因为NoneType意味着您实际上没有得到任何类或对象的实例，而不是您认为正在使用的类或对象的实例。这意味着上述赋值或函数调用失败或返回意外结果

free = free.drop (['free'], 1, inplace=True)

也检查这些

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您得到的是AttributeError:“NoneType”对象没有属性“drop”，因为NoneType意味着您实际上没有得到您认为正在使用的任何类或对象的实例。这意味着上述赋值或函数调用失败或返回意外结果

free = free.drop (['free'], 1, inplace=True)

也检查这些

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以下是一些示例。请注意，列由标签引用

import pandas
free = pandas.DataFrame([], columns=['a', 'b', 'c', 'd'])
print(free)

# to delete the row named 'a'
free = free.drop(['a'], axis=1)
print(free)

# to delete the first row (here, it will be column 'b')
free = free.drop( free.columns[0], axis=1)
print(free)

# to delete the row 'd' with inplace=True (you don't need to tyhpe `free =` )
free.drop(['d'], axis=1, inplace=True)
print(free)```

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这里有一些例子。请注意，列由标签引用

import pandas
free = pandas.DataFrame([], columns=['a', 'b', 'c', 'd'])
print(free)

# to delete the row named 'a'
free = free.drop(['a'], axis=1)
print(free)

# to delete the first row (here, it will be column 'b')
free = free.drop( free.columns[0], axis=1)
print(free)

# to delete the row 'd' with inplace=True (you don't need to tyhpe `free =` )
free.drop(['d'], axis=1, inplace=True)
print(free)```