pandas.read_excel parameter "sheet_name" not working

It looks like you're using the old version of Python. So try to change your code

df = pd.read_excel(file_with_data, sheetname=sheet_with_data)

It should work properly.

You can try to use pd.ExcelFile:

xls = pd.ExcelFile('path_to_file.xls')
df1 = pd.read_excel(xls, 'Sheet1')
df2 = pd.read_excel(xls, 'Sheet2')