Python 数据帧在第一次循环后变为非类型

在第一个for循环运行之后，contDF设置为非类型对象。因此，它遇到了一个问题，因为contDF[col]在第二个循环中不存在。在第一个循环结束时，contDF是正确的。当第二个循环开始时，它如何变成无

def Lable_Controls_and_Exper(colum_name, list_values_to_determine_control, list_values_to_determine_exper):
contDF = copy.deepcopy(masterDF)

for col in colum_name:
    index = 0
    print(col+':')
    print(contDF)
    print(contDF[col])
    for element in contDF[col]:
        #print(index)
        #if list values match a row in a column then the row is excluded
        for value in list_values_to_determine_control:

            if(element == value 
                and contDF.loc[index,'control_or_experiment'] != 'exper'):
                contDF.loc[index,'control_or_experiment'] = 'control'

        for value in list_values_to_determine_exper:
            if(element == value):
                contDF.loc[ index, 'control_or_experiment' ] = 'exper'

        index = index + 1 
    print(contDF)
    print(contDF[col])

这是输出

抑郁症、躁郁症、精神分裂症： #样本年龄\年抗生素\史\ 0 10317.000049761 52过去一年我没有服用抗生素。
1 10317.000040165 32过去一年我没有服用抗生素。
2 10317.000030322 43.0过去一年我没有服用抗生素。
3 10317.00002857 56.0我在过去一年中没有服用抗生素。
4 10317.00003818939.0过去一年我没有服用抗生素。
5 10317.000001281 61.0过去一年我没有服用抗生素。
6 10317.000036487 46.0我在过去一年中没有服用抗生素

       bmi_cat depression_bipolar_schizophrenia  \
0   Overweight                      Unspecified   
1  Unspecified                      Unspecified   
2       Normal     I do not have this condition   
3   Overweight     I do not have this condition   
4   Overweight                      Unspecified   
5  Unspecified                      Unspecified   
6        Obese     I do not have this condition   

  mental_illness_type_depression smoking_frequency control_or_experiment  
0                    Unspecified             Never                  none  
1                    Unspecified             Never                  none  
2                    Unspecified             Never                  none  
3                    Unspecified             Never                  none  
4                    Unspecified             Never                  none  
5                    Unspecified             Never                  none  
6                    Unspecified             Never                  none  
0                     Unspecified
1                     Unspecified
2    I do not have this condition
3    I do not have this condition
4                     Unspecified
5                     Unspecified
6    I do not have this condition
Name: depression_bipolar_schizophrenia, dtype: object
         #SampleID age_years                              antibiotic_history  \
0  10317.000049761        52  I have not taken antibiotics in the past year.   
1  10317.000040165        32  I have not taken antibiotics in the past year.   
2  10317.000030322      43.0  I have not taken antibiotics in the past year.   
3  10317.000028857      56.0  I have not taken antibiotics in the past year.   
4  10317.000038189      39.0  I have not taken antibiotics in the past year.   
5  10317.000001281      61.0  I have not taken antibiotics in the past year.   
6  10317.000036487      46.0  I have not taken antibiotics in the past year.   

       bmi_cat depression_bipolar_schizophrenia  \
0   Overweight                      Unspecified   
1  Unspecified                      Unspecified   
2       Normal     I do not have this condition   
3   Overweight     I do not have this condition   
4   Overweight                      Unspecified   
5  Unspecified                      Unspecified   
6        Obese     I do not have this condition   

  mental_illness_type_depression smoking_frequency control_or_experiment  
0                    Unspecified             Never               control  
1                    Unspecified             Never               control  
2                    Unspecified             Never               control  
3                    Unspecified             Never               control  
4                    Unspecified             Never               control  
5                    Unspecified             Never               control  
6                    Unspecified             Never               control  
0                     Unspecified
1                     Unspecified
2    I do not have this condition
3    I do not have this condition
4                     Unspecified
5                     Unspecified
6    I do not have this condition
Name: depression_bipolar_schizophrenia, dtype: object
mental_illness_type_depression:
None

---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-13-365067e6465a> in <module>()
     11     col_data_control = user_input_controlDF[col_name].tolist()
     12     col_data_exper = user_input_experimentDF[col_name].tolist()
---> 13     masterDF = Lable_Controls_and_Exper([col_name], col_data_control, col_data_exper)
     14     while_count_two = while_count_two + 1
     15 print("done")

<ipython-input-12-3898e2174ad7> in Lable_Controls_and_Exper(colum_name, list_values_to_determine_control,

---

虽然您没有在代码转储中包含相关代码，但它碰巧出现在您的回溯中：

masterDF = Lable_Controls_and_Exper([col_name], col_data_control, col_data_exper)

无论此函数返回什么，都将该结果分配给

masterDF

由于函数中的任何位置都没有

return

语句，因此它返回

None

，这意味着您将

None

分配给

masterDF

请注意，您正在将一个元素的列表传递给第一个参数。所以循环只发生一次。下一次通过循环要等到下次调用此函数时

下次调用函数时，当它深度复制

masterDF

时，它正在复制

None

由于不清楚此代码试图做什么，因此很难告诉您如何修复它，但几乎可以肯定这是以下两件事之一：

不要将此函数的结果分配给

masterDF

，或

更改此函数可返回您希望分配给

masterDF

的有用内容

---

如果您能提供一个可以剪切粘贴的数据帧示例，这将非常有用。

masterDF = Lable_Controls_and_Exper([col_name], col_data_control, col_data_exper)