IndexError：使用 for 循环时列表索引超出范围

Question

While running for loop in below code in python getting list index out of range error. Also, please let me know if the for loop can be written in a better way.

Error:- IndexError-Traceback (most recent call last)
<ipython-input-296-32d392aacb61> in <module>
---> 22         a = workbook.connections[0]

IndexError: list index out of range

Code:

import tableauserverclient as TSC
import pandas as pd

tableau_auth = TSC.PersonalAccessTokenAuth('{Token_Name}',
'{Token_Secret}' , site_id="{Site}")

server = TSC.Server('Site_url',use_server_version=True)
request_options = TSC.RequestOptions(pagesize=1000)


with server.auth.sign_in(tableau_auth):

    all_workbooks_items = list(TSC.Pager(server.workbooks, request_options))
    workbook_id=[workbook.id for workbook in all_workbooks_items]

    connection2=pd.DataFrame({"Datasource_id":connection.datasource_id,
                          "Datasource_name":a.datasource_name,
                         "Workbook Name":workbook.name} , index=[0])

    for wbk_ids in workbook_id:
        workbook = server.workbooks.get_by_id(wbk_ids)
        server.workbooks.populate_connections(workbook)
        a = workbook.connections[0]
        print({a.datasource_id,a.datasource_name,workbook.name})
        connection2=connection2.append({"Datasource_id":a.datasource_id,
                                    "Datasource_name":a.datasource_name,
                                    "Workbook Name":workbook.name} ,ignore_index=True)

    server.auth.sign_out()

Answer 1

Instead of

        a = workbook.connections[0]
        print({a.datasource_id,a.datasource_name,workbook.name})
        connection2=connection2.append({"Datasource_id":a.datasource_id,
                                    "Datasource_name":a.datasource_name,
                                    "Workbook Name":workbook.name} ,ignore_index=True)

use

        if workbook.connections:
            a = workbook.connections[0]
            print({a.datasource_id,a.datasource_name,workbook.name})
            connection2=connection2.append({"Datasource_id":a.datasource_id,
                                    "Datasource_name":a.datasource_name,
                                    "Workbook Name":workbook.name} ,ignore_index=True)