“Must explicitly set engine if not passing in buffer or path for io” in Panda

问题

When running the following Python Panda code:

    xl          = pd.ExcelFile(dataFileUrl)
    sheets      = xl.sheet_names
    data        = xl.parse(sheets[0])
    colheaders  = list(data)

I receive the ValueError:

Must explicitly set engine if not passing in buffer or path for io

The file is for sure an excel file, no doubt about that.

What is happening?

回答1:

I would try

xl = pd.ExcelFile(dataFileUrl, engine='xlrd')

回答2:

I had this same problem and it was because the code that generated dataFileUrl produced a list with only one element in it. Changing to dataFileUrl[0] fixed the problem.

回答3:

If you give your file path as:

#Read and write to excel
dataFileUrl = R"D:\\real_names.xlsx"
data = pd.read_excel(dataFileUrl)

it will possibly work. I have tried and tested.

来源：https://stackoverflow.com/questions/42950045/must-explicitly-set-engine-if-not-passing-in-buffer-or-path-for-io-in-panda