pandas 不覆蓋寫入 excel 同一張 Sheet 表

之前寫的太草率了，這裏解決的問題是：

用 Pandas 可以不覆蓋的寫入同一張 Sheet 表，

當然寫入不同的表也可以實現，

在 stackoverflow 上看到的代碼，

我試了試可以，感謝 stackoverflow 的 MaxU

 

這裏在 jupyter notebook 中實現，python 版本 3.7

我自己寫了測試代碼，在下面，

第一個部分的代碼就是從 stackoverflow 上 copy 的函數 append_df_to_excel() ，

第二個部分的代碼測試行不行，分別寫入Sheet1表（多次寫入不覆蓋），Sheet2表。

最後有成功寫入的截圖爲證。

這是 StackOverflow 網頁鏈接

append_df_to_excel('d:/temp/test.xlsx', df, sheet_name='Sheet2', index=False)

import pandas as pd
from openpyxl import load_workbook

def append_df_to_excel(filename, df, sheet_name='Sheet1', startrow=None,
                       truncate_sheet=False, 
                       **to_excel_kwargs):
    """
    Append a DataFrame [df] to existing Excel file [filename]
    into [sheet_name] Sheet.
    If [filename] doesn't exist, then this function will create it.

    Parameters:
      filename : File path or existing ExcelWriter
                 (Example: '/path/to/file.xlsx')
      df : dataframe to save to workbook
      sheet_name : Name of sheet which will contain DataFrame.
                   (default: 'Sheet1')
      startrow : upper left cell row to dump data frame.
                 Per default (startrow=None) calculate the last row
                 in the existing DF and write to the next row...
      truncate_sheet : truncate (remove and recreate) [sheet_name]
                       before writing DataFrame to Excel file
      to_excel_kwargs : arguments which will be passed to `DataFrame.to_excel()`
                        [can be dictionary]

    Returns: None
    """
   # from openpyxl import load_workbook

   # import pandas as pd

    # ignore [engine] parameter if it was passed
    if 'engine' in to_excel_kwargs:
        to_excel_kwargs.pop('engine')

    writer = pd.ExcelWriter(filename, engine='openpyxl')

    # Python 2.x: define [FileNotFoundError] exception if it doesn't exist 
    try:
        FileNotFoundError
    except NameError:
        FileNotFoundError = IOError


    try:
        # try to open an existing workbook
        writer.book = load_workbook(filename)

        # get the last row in the existing Excel sheet
        # if it was not specified explicitly
        if startrow is None and sheet_name in writer.book.sheetnames:
            startrow = writer.book[sheet_name].max_row

        # truncate sheet
        if truncate_sheet and sheet_name in writer.book.sheetnames:
            # index of [sheet_name] sheet
            idx = writer.book.sheetnames.index(sheet_name)
            # remove [sheet_name]
            writer.book.remove(writer.book.worksheets[idx])
            # create an empty sheet [sheet_name] using old index
            writer.book.create_sheet(sheet_name, idx)

        # copy existing sheets
        writer.sheets = {ws.title:ws for ws in writer.book.worksheets}
    except FileNotFoundError:
        # file does not exist yet, we will create it
        pass

    if startrow is None:
        startrow = 0

    # write out the new sheet
    df.to_excel(writer, sheet_name, startrow=startrow, **to_excel_kwargs)

    # save the workbook
    writer.save()

# 幾個例子用於測試寫入 excel 用的
df1 = pd.DataFrame({'One':[1,2,3]})
df2 = pd.DataFrame({'Two':[4,5,6]})
df3 = pd.DataFrame({'Three':[7,8,9]})
df4 = pd.DataFrame({'Four':[10,11,12]})

# 寫入 Aho.xlsx 這個 excel 的 sheet1 表的第0行（startrow=0）,第0列（startcol=0）
append_df_to_excel('Aho.xlsx', df1, sheet_name='Sheet1', startcol=0,startrow=0,index=False)

# 寫入sheet1 的第0行（startrow=0）,第3列（startcol=3）
append_df_to_excel('Aho.xlsx', df2, sheet_name='Sheet1', startcol=3,startrow=0,index=False)

# 寫入sheet1 的第0行（startrow=0）,第7列（startcol=7）
append_df_to_excel('Aho.xlsx', df3, sheet_name='Sheet1', startcol=7,startrow=0,index=False)

# 寫入sheet2 的第0行（startrow=0）,第0列（startcol=0）
append_df_to_excel('Aho.xlsx', df4, sheet_name='Sheet2', startcol=0,startrow=0,index=False)