easy-ml/data/insight/data_explore.py

# -*- coding: utf-8 -*-
"""
@author: yq
@time: 2024/11/13
@desc: 数据探索
"""
import numbers

import pandas as pd
from pandas.core.dtypes.common import is_numeric_dtype


class DataExplore():

    def __init__(self):
        pass

    @staticmethod
    def check_type(df: pd.DataFrame):
        check_msg = ""
        for column in df.columns:
            if not is_numeric_dtype(df[column]):
                values = list(df[column])
                cnt_str = 0
                cnt_number = 0
                cnt_other = 0
                for value in values:
                    if isinstance(value, numbers.Number):
                        cnt_number += 1
                    elif isinstance(value, str):
                        cnt_str += 1
                    else:
                        cnt_other += 1
                if len(values) != cnt_str:
                    check_msg = f"{check_msg}【{column}】数值型数量{cnt_number} 字符型数量{cnt_str} 其它类型数量{cnt_other}\n"
        return check_msg

    @staticmethod
    def distribution(df: pd.DataFrame) -> pd.DataFrame:
        """
        数据分布，缺失率，中位数，众数，偏离度等
        """
        summary = []

        for column in df.columns:
            # 创建一个新的字典
            column_summary = {
                'column': column,
                'missing_rate': df[column].isnull().mean(),
            }

            # 判断数据类型
            if df[column].dtype == 'object':
                column_summary['type'] = 'categorical'
            else:
                column_summary['type'] = 'numerical'

            if column_summary['type'] == 'numerical':
                column_summary['min'] = df[column].min()
                column_summary['25%'] = df[column].quantile(0.25)
                column_summary['median'] = df[column].median()
                column_summary['75%'] = df[column].quantile(0.75)
                column_summary['max'] = df[column].max()
                column_summary['skewness'] = df[column].skew()
            else:
                # 类别型变量
                column_summary['mode'] = df[column].mode()[0] if not df[column].mode().empty else None
                freq = df[column].value_counts(normalize=True).head(10)
                column_summary['top_10_value'] = freq.index.tolist()
                column_summary['top_10_ratio'] = freq.tolist()

            summary.append(column_summary)

        return pd.DataFrame(summary)


if __name__ == "__main__":
    pass