Python 錯誤：AttributeError：'NoneType' object 沒有屬性'to_excel'

Question

我正在嘗試合並一個目錄中的所有文件並將合並的文件保存到另一個目錄中。 我正在使用 Python 3.8。 當我運行代碼時，我得到以下帶有 AttributeError 的信息：

c:\test\Upload test\Book1.xlsx
c:\test\Upload test\Book2.xlsx
c:\test\Upload test\Book3.xlsx
Traceback (most recent call last):
File "C:/Python/PythonDev/combine.py", line 104, in <module>
newdf.to_excel(writer,"All")
AttributeError: 'NoneType' object has no attribute 'to_excel'

編碼：

import pandas as pd
import globe
filelist = glob.glob(r'c:\test\Upload test\*.xlsx')
file1 = "*.*"
for i in  filelist:
    file2 = pd.read_excel(i)
    file2['FileName'] = i
    file1 = ['newdf']
    newdf = file1.append(file2)
    print (i)
writer = pd.ExcelWriter(r'c:\test\Uploaded\uploadfile.xlsx', engine= 'xlsxwriter')
newdf.to_excel(writer,"All")
writer.save()

Answer 1

Append 沒有返回任何東西......

嘗試這樣的事情：

import pandas as pd
import glob

raw_files = glob.glob(r'c:\test\Upload test\*.xlsx')

pd_files = pd.DataFrame()

for file in raw_files:
    pd_files.append(pd.read_excel(file))

pd_files.to_excel("c:\test\Uploaded\uploadfile.xlsx")