失败：下载由 jupyter notebook 生成的 Excel 文件时出现网络错误

Question

my jupyter notebook is saving a dataframe(having styles) to an excel file. then I have created a link to download this excel file:

df=df.to_excel('ABC.xlsx', index=True)
filename ='ABC.xlsx'
file_link = "<a href='{href}' download='ABC.xlsx'> Download ABC.xlsx</a>"
html = HTML(file_link.format(href=filename))
dispaly(html)

but when i click on link-Download ABC.xlsx, I am getting- Failed: Network error . On the contrary it is working fine when i am downloading CSV file the same way

Adding csv code, there is some base64 encoding added in csv code without which csv code is also not working:

def func(df,title="Download csv file",filename="ABC.csv"):
    csv=df.to_csv(index=True) 
    b64 =base64.b64encode(csv.encode()) 
    payload=b64.decode()
   html = "<a href="data:text/csv;base64,{payload}" download="{filename}" target="_blank">{title}</a>"
   html = html.format(payload=payload,title=title,filename=filename)
   return HTML(html)

i tried editing this function for excel file:

def func(df,title="Download excel file",filename="ABC.xlsx"):
    xls=df.to_excel("xyz.xlsx",index=True) 
    b64 =base64.b64encode(xls.encode()) 
    payload=b64.decode()
   html = "<a href="data:text/xls;base64,{payload}" download="{filename}" target="_blank">{title}</a>"
   html = html.format(payload=payload,title=title,filename=filename)
   return HTML(html)

for excel code it giving error: 'NoneType' object has no attribute 'encode'

Answer 1

In you csv code, you use csv=df.to_csv(index=True) , according to docs

If path_or_buf is None, returns the resulting csv format as a string. Otherwise returns None.

here you didn't specify path_or_buf , so return value is csv content . this is why you can download csv.

Now to_excel doc desn't say it has any return value. so your payload don't contain anything at all.

To solve, you can manually open file again and read as base64 format string:

def file_to_base64(file):
#file should be the actual file name you wrote
    with open(file, "rb") as image_file:
        encoded_string = base64.b64encode(image_file.read())
        return encoded_string.decode()

replace the two lines

b64 =base64.b64encode(xls.encode()) 
payload=b64.decode()

with:

payload = file_to_base64(file)