energy-data-trans/utils/file/trans_methods.py

# -*- coding: utf-8 -*-
# @Time    : 2024/5/16
# @Author  : 魏志亮
import ast
import datetime
import os
import shutil
import warnings

import chardet
import pandas as pd

from utils.log.trans_log import trans_print

warnings.filterwarnings("ignore")


# 获取文件编码
def detect_file_encoding(filename):
    # 读取文件的前1000个字节（足够用于大多数编码检测）
    with open(filename, 'rb') as f:
        rawdata = f.read(1000)
    result = chardet.detect(rawdata)
    encoding = result['encoding']

    trans_print("文件类型:", filename, encoding)

    if encoding is None:
        encoding = 'gb18030'

    if encoding.lower() in ['utf-8', 'ascii', 'utf8']:
        return 'utf-8'

    return 'gb18030'


def del_blank(df=pd.DataFrame(), cols=list()):
    for col in cols:
        if df[col].dtype == object:
            df[col] = df[col].str.strip()
    return df


# 切割数组到多个数组
def split_array(array, num):
    return [array[i:i + num] for i in range(0, len(array), num)]


def find_read_header(file_path, trans_cols, resolve_col_prefix=None):
    df = read_file_to_df(file_path, nrows=20)
    df.reset_index(inplace=True)
    count = 0
    header = None
    df_cols = df.columns
    if resolve_col_prefix:
        valid_eval(resolve_col_prefix)
        df_cols = [eval(resolve_col_prefix) for column in df.columns]

    for col in trans_cols:
        if col in df_cols:
            count = count + 1
            if count >= 2:
                header = 0
                break

    count = 0

    for index, row in df.iterrows():
        if resolve_col_prefix:
            values = [eval(resolve_col_prefix) for column in row.values]
        else:
            values = row.values
        for col in trans_cols:
            if col in values:
                count = count + 1
                if count > 2:
                    header = index + 1
                    break

    return header


# 读取数据到df
def read_file_to_df(file_path, read_cols=list(), trans_cols=None, nrows=None, not_find_header='raise',
                    resolve_col_prefix=None):
    begin = datetime.datetime.now()
    trans_print('开始读取文件', file_path)
    header = 0
    find_cols = list()
    if trans_cols:
        header = find_read_header(file_path, trans_cols, resolve_col_prefix)
        trans_print(os.path.basename(file_path), "读取第", header, "行")
        if header is None:
            if not_find_header == 'raise':
                message = '未匹配到开始行，请检查并重新指定'
                trans_print(message)
                raise Exception(message)
            elif not_find_header == 'ignore':
                pass

    # read_cols.extend(find_cols)
    df = pd.DataFrame()
    if header is not None:
        try:
            if str(file_path).lower().endswith("csv") or str(file_path).lower().endswith("gz"):
                encoding = detect_file_encoding(file_path)
                end_with_gz = str(file_path).lower().endswith("gz")
                if read_cols:
                    if end_with_gz:
                        df = pd.read_csv(file_path, encoding=encoding, usecols=read_cols, compression='gzip',
                                         header=header,
                                         nrows=nrows)
                    else:
                        df = pd.read_csv(file_path, encoding=encoding, usecols=read_cols, header=header,
                                         on_bad_lines='warn', nrows=nrows)
                else:

                    if end_with_gz:
                        df = pd.read_csv(file_path, encoding=encoding, compression='gzip', header=header, nrows=nrows)
                    else:
                        df = pd.read_csv(file_path, encoding=encoding, header=header, on_bad_lines='warn', nrows=nrows)

            else:
                xls = pd.ExcelFile(file_path)
                # 获取所有的sheet名称
                sheet_names = xls.sheet_names
                for sheet_name in sheet_names:
                    if read_cols:
                        now_df = pd.read_excel(xls, sheet_name=sheet_name, header=header, usecols=read_cols,
                                               nrows=nrows)
                    else:
                        now_df = pd.read_excel(xls, sheet_name=sheet_name, header=header, nrows=nrows)

                    now_df['sheet_name'] = sheet_name
                    df = pd.concat([df, now_df])
                xls.close()
            trans_print('文件读取成功:', file_path, '数据数量:', df.shape, '耗时:', datetime.datetime.now() - begin)
        except Exception as e:
            trans_print('读取文件出错', file_path, str(e))
            message = '文件:' + os.path.basename(file_path) + ',' + str(e)
            raise ValueError(message)

    return df


def __build_directory_dict(directory_dict, path, filter_types=None):
    # 遍历目录下的所有项
    for item in os.listdir(path):
        item_path = os.path.join(path, item)
        if os.path.isdir(item_path):
            __build_directory_dict(directory_dict, item_path, filter_types=filter_types)
        elif os.path.isfile(item_path):
            if path not in directory_dict:
                directory_dict[path] = []

            if filter_types is None or len(filter_types) == 0:
                directory_dict[path].append(item_path)
            elif str(item_path).split(".")[-1] in filter_types:
                if str(item_path).count("~$") == 0:
                    directory_dict[path].append(item_path)


# 读取路径下所有的excel文件
def read_excel_files(read_path, filter_types=None):
    if filter_types is None:
        filter_types = ['xls', 'xlsx', 'csv', 'gz']
    if os.path.isfile(read_path):
        return [read_path]

    directory_dict = {}
    __build_directory_dict(directory_dict, read_path, filter_types=filter_types)

    return [path for paths in directory_dict.values() for path in paths if path]


# 读取路径下所有的文件
def read_files(read_path, filter_types=None):
    if filter_types is None:
        filter_types = ['xls', 'xlsx', 'csv', 'gz', 'zip', 'rar']
    if os.path.isfile(read_path):
        return [read_path]
    directory_dict = {}
    __build_directory_dict(directory_dict, read_path, filter_types=filter_types)

    return [path for paths in directory_dict.values() for path in paths if path]


def copy_to_new(from_path, to_path):
    is_file = False
    if to_path.count('.') > 0:
        is_file = True

    create_file_path(to_path, is_file_path=is_file)

    shutil.copy(from_path, to_path)


# 创建路径
def create_file_path(path, is_file_path=False):
    """
    创建路径
    :param path:创建文件夹的路径
    :param is_file_path: 传入的path是否包含具体的文件名
    """
    if is_file_path:
        path = os.path.dirname(path)

    if not os.path.exists(path):
        os.makedirs(path, exist_ok=True)


def valid_eval(eval_str):
    """
    验证 eval 是否包含非法的参数
    """
    safe_param = ["column", "wind_name", "df", "error_time", "str", "int"]
    eval_str_names = [node.id for node in ast.walk(ast.parse(eval_str)) if isinstance(node, ast.Name)]
    if not set(eval_str_names).issubset(safe_param):
        raise NameError(
            eval_str + " contains unsafe name :" + str(','.join(list(set(eval_str_names) - set(safe_param)))))
    return True


if __name__ == '__main__':
    # aa = valid_eval("column[column.find('_')+1:]")
    # print(aa)
    #
    # aa = valid_eval("df['123'].apply(lambda wind_name: wind_name.replace('元宝山','').replace('号风机',''))")
    # print(aa)
    #
    # aa = valid_eval("'记录时间' if column == '时间' else column;import os; os.path")
    # print(aa)

    df = read_file_to_df(r"D:\data\11-12月.xls", trans_cols=['风机', '时间', '有功功率', '无功功率', '功率因数', '频率'], nrows=30)

    print(df.columns)