python - 将行附加到数据框

Question

对 pandas 来说相当陌生，我创建了一个名为 rollParametersDf 的数据框:

 rollParametersDf = pd.DataFrame(columns=['insampleStart','insampleEnd','outsampleStart','outsampleEnd'], index=[])

给出了 4 个列标题。我想保留我正在进行的一项研究的引用日期。我想添加使用以下代码创建的索引名称为 roll1、roll2..rolln 的数据行(一次一行):

            outsampleEnd = customCalender.iloc[[totalDaysAvailable]]
            outsampleStart = customCalender.iloc[[totalDaysAvailable-outsampleLength+1]]
            insampleEnd = customCalender.iloc[[totalDaysAvailable-outsampleLength]]
            insampleStart = customCalender.iloc[[totalDaysAvailable-outsampleLength-insampleLength+1]]

            print('roll',rollCount,'\t',outsampleEnd,'\t',outsampleStart,'\t',insampleEnd,'\t',insampleStart,'\t')

            rollParametersDf.append({insampleStart,insampleEnd,outsampleStart,outsampleEnd})

我尝试使用追加，但无法追加单个行。

我希望最终的数据框看起来像:

     insampleStart insampleEnd outsampleStart outsampleEnd
roll1       1             5           6              8      
roll2       2             6           7              9
:
rolln

Answer 1

您提供要附加的键值对

df = pd.DataFrame({'insampleStart':[], 'insampleEnd':[], 'outsampleStart':[], 'outsampleEnd':[]})
df = df.append({'insampleStart':[1,2], 'insampleEnd':[5,6], 'outsampleStart':[6,7], 'outsampleEnd':[8,9]}, ignore_index=True)