xlwings結合dataframe數據的寫入

一、代碼

import xlwings as xw
import pandas as pd

xl_path=r'***'
df_path=r'***'

df=pd.read_excel(df_path)
app=xw.App(visible=False,add_book=False)

#不彈出提示窗
app.display_alerts=False

load_wb=app.books.open(xl_path)
load_ws=load_wb.sheets["sheetname"]

#清除sheet內的所有數據
load_ws.clear()

#將dataframe轉成列表寫入
load_ws.range('A1').expand('table').value = df.values.tolist()

load_wb.save()
load_wb.close()
app.quit()

二、改進封裝代碼

import xlwings as xw
import pandas as pd
import numpy as np


class PathError(BaseException):
    def __init__(self, error):
        self.error = error


class WriteError(BaseException):
    def __init__(self, error):
        self.error = error


# 判斷元素是否為數字
def is_number(s):
    try:
        if np.isnan(s) or s == False or s == True:
            return False
    except Exception:
        pass
    try:
        # 判斷是否為浮點數
        float(s)
        return True
    except Exception:
        pass
    try:
        import unicodedata  # 處理ASCii碼的包
        # 把一個表示數字的字符串轉換為浮點數返回的函數
        unicodedata.numeric(s)
        return True
    except (TypeError, ValueError):
        pass
    return False


class ExcelMerge(object):
    def __init__(self):
        self.app = xw.App(visible=False, add_book=False)
        self.app.display_alerts = False
        self.load_wb = None
        self.load_ws = None
        self.data_list = []

    def merge(self, master_path=None, retinue_path=None, sheet=0):
        if not master_path or not retinue_path:
            raise PathError("文件地址不能為空")

        self.data_list = self.read_df(master_path)
        self.data_list.extend(self.read_df(retinue_path))
        self.data_list = pd.DataFrame(self.data_list)
        try:
            self.load_wb = self.app.books.open(master_path)
            self.load_ws = self.load_wb.sheets[sheet]
            self.load_ws.range('A2').expand('table').value = self.data_list
        except Exception as e:
            raise WriteError("excel寫入錯誤：{}".format(e))
        finally:
            self.load_wb.save()
            self.load_wb.close()
            self.app.quit()
    
    def read_df(self, path):
        df = pd.read_excel(path)
        col_list = []
        # 以下代碼是解決純數字過長導致寫入excel后幾位變0
        for column in df:
            for v in df[column]:
                if is_number(v):
                    if len(str(v)) > 12:
                        col_list.append(column)
                        break
        if col_list:
            for c in col_list:
                df[c] = df[c].map(lambda x: "'" + str(x) if not pd.isnull(x) else "")

        return df.values.tolist()

em=ExcelMerge()

if __name__ == '__main__':
    # 合並2個excel，一個主表，一個從表
    master_path="****"
    retinue_path="****"
    em.merge()