删除 pandas 中少于 6 位小数的列

Question

我有一个数据框，其中一些列包含带 6 位小数的浮点数，但有些列只有 1 位或 2 位小数。我想删除所有少于 6 位小数的列。我尝试用少于 6 位小数填充列，但结果并不理想。

Answer 1

试试这个：

import pandas as pd
data_preprocessed1 = pd.DataFrame({ "Value":[2675.39881,62.2320980,9.3409093,3.343434443],
                               "Landed weight":[10.0,5.0,10.0,10.10 ],
                               "Extra": [3.5728, 3.8263, 3.827264, 3.257]})
    

def delete_after_n_number(df,column,n):
    """
     Deleting column with less than 6 decimals in pandas

    delete all columns with less than 6 decimals

    Parameters
    ----------
    df : pd.DataFrame 
        initial dataframe 
    column : str
        name of the column you to check 
    n : int
        Deleting columns with less than n decimals in pandas

    Returns
    -------
    dataframe : pd.DataFrame
       dataframe wanted

    """
    lst_col=df.columns.to_list()
    df['copy'] = df[column].astype(str)
    df['count']=[len(val) for val in df['copy'].str.split('.',n=1,expand=True)[1]]
    verif=df.loc[df['count']<n,:].copy()
    if verif.shape[0]>0:
        lst_col.remove(column)
        df=df[lst_col].copy()
        print(lst_col)
    else :
        df=df[lst_col].copy()
        print(lst_col)
    return df

for col in data_preprocessed1.select_dtypes(include=[np.float64]).columns : 
    data_preprocessed1=delete_after_n_number(data_preprocessed1,col,6)
data_preprocessed1

输入：

输出：

删除 pandas 中少于 6 位小数的列

Deleting columns with less than 6 decimals in pandas

python

decimal

pandas