首先,我在一个jupyter笔记本中使用python 3.50。Python熊猫Multindex列
我想创建一个DataFrame来显示报表中的一些数据。我希望它有两个索引栏(如果引用它的术语不正确,请不要用它来处理熊猫)。
我有这样的示例代码工作的:
frame = pd.DataFrame(np.arange(12).reshape((4, 3)),
index =[['a', 'a', 'b', 'b'], [1, 2, 1, 2]],
columns =[['Ohio', 'Ohio', 'Ohio'], ['Green', 'Red', 'Green']])
但是,当我试图把它带到我的情况下,它给了我一个错误:
cell_rise_Inv= pd.DataFrame([[0.00483211, 0.00511619, 0.00891821, 0.0449637, 0.205753],
[0.00520049, 0.00561577, 0.010993, 0.0468998, 0.207461],
[0.00357213, 0.00429087, 0.0132186, 0.0536389, 0.21384],
[-0.0021868, -0.0011312, 0.0120546, 0.0647213, 0.224749],
[-0.0725403, -0.0700884, -0.0382486, 0.0899121, 0.313639]],
index =[['transition [ns]','transition [ns]','transition [ns]','transition [ns]','transition [ns]'],
[0.0005, 0.001, 0.01, 0.1, 0.5]],
columns =[[0.01, 0.02, 0.05, 0.1, 0.5],['capacitance [pF]','capacitance [pF]','capacitance [pF]','capacitance [pF]','capacitance [pF]']])
cell_rise_Inv
---------------------------------------------------------------------------
AssertionError Traceback (most recent call last)
<ipython-input-89-180a1ad88403> in <module>()
6 index =[['transition [ns]','transition [ns]','transition [ns]','transition [ns]','transition [ns]'],
7 [0.0005, 0.001, 0.01, 0.1, 0.5]],
----> 8 columns =[[0.01, 0.02, 0.05, 0.1, 0.5],['capacitance [pF]','capacitance [pF]','capacitance [pF]','capacitance [pF]','capacitance [pF]']])
9 cell_rise_Inv
C:\Users\Josele\Anaconda3\lib\site-packages\pandas\core\frame.py in __init__(self, data, index, columns, dtype, copy)
261 if com.is_named_tuple(data[0]) and columns is None:
262 columns = data[0]._fields
--> 263 arrays, columns = _to_arrays(data, columns, dtype=dtype)
264 columns = _ensure_index(columns)
265
C:\Users\Josele\Anaconda3\lib\site-packages\pandas\core\frame.py in _to_arrays(data, columns, coerce_float, dtype)
5350 if isinstance(data[0], (list, tuple)):
5351 return _list_to_arrays(data, columns, coerce_float=coerce_float,
-> 5352 dtype=dtype)
5353 elif isinstance(data[0], collections.Mapping):
5354 return _list_of_dict_to_arrays(data, columns,
C:\Users\Josele\Anaconda3\lib\site-packages\pandas\core\frame.py in _list_to_arrays(data, columns, coerce_float, dtype)
5429 content = list(lib.to_object_array(data).T)
5430 return _convert_object_array(content, columns, dtype=dtype,
-> 5431 coerce_float=coerce_float)
5432
5433
C:\Users\Josele\Anaconda3\lib\site-packages\pandas\core\frame.py in _convert_object_array(content, columns, coerce_float, dtype)
5487 # caller's responsibility to check for this...
5488 raise AssertionError('%d columns passed, passed data had %s '
-> 5489 'columns' % (len(columns), len(content)))
5490
5491 # provide soft conversion of object dtypes
AssertionError: 2 columns passed, passed data had 5 columns
任何想法?我不明白为什么这个例子有效,我不这样做。 :S
谢谢提前:)。
错误表明您没有传入与索引匹配的形状的数据:AssertionError:传递了2列,传递的数据有5列 –
看起来您的索引重复5次“电容[pF]”,而数据只有两列... –
另外,您可能想要切换标签的顺序(''capacitance [pF]'')和多索引中的数字。 –