python-3.x - TypeError : ufunc 'isfinite' not supported for the input types, 并且输入无法安全地强制转换为任何支持的类型

Question

运行此行后，我收到以下错误:
类型错误:输入类型不支持 ufunc 'isfinite'，并且无法根据转换规则 ''safe'' 将输入安全地强制转换为任何受支持的类型

df[~(  (pd.np.isclose(df.Sizes.round(3), df.Volumes))  & (df['color'] == 'Blue')   )] 

我该如何解决？

Answer 1

In [152]: df=pd.DataFrame(np.arange(12.).reshape(4,3), columns=['one','two','three'])                        
In [153]: df.three[:] = ['a',np.nan,4,3.2]                                                                   
In [154]: df                                                                                                 
Out[154]: 
   one   two three
0  0.0   1.0     a
1  3.0   4.0   nan
2  6.0   7.0     4
3  9.0  10.0   3.2
In [155]: pd.np.isclose(df.one.round(3), df.two)                                                             
Out[155]: array([False, False, False, False])
In [156]: pd.np.isclose(df.one.round(3), df.three)                                                           
---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-156-d99a19b1d9b5> in <module>
----> 1 pd.np.isclose(df.one.round(3), df.three)

/usr/local/lib/python3.6/dist-packages/numpy/core/numeric.py in isclose(a, b, rtol, atol, equal_nan)
   2520 
   2521     xfin = isfinite(x)
-> 2522     yfin = isfinite(y)
   2523     if all(xfin) and all(yfin):
   2524         return within_tol(x, y, atol, rtol)

TypeError: ufunc 'isfinite' not supported for the input types, and the inputs could not be safely coerced to any supported types according to the casting rule ''safe''

对两个 float32 的测试列有效，但是当一列是具有非数字值的对象 dtype 时会引发此错误。