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Solve the following python programming problem given the following code:
# Library/Function to use operating system's shell script command, e.g. bash, echo, cd, pwd, etc
import subprocess, time

# Funciton to trigger RPA-Bot (TagUI script: mortgage loan application automation) from VA-Bot (python script)
# Trigger RPA-Bot [ Synchronous  ]
# def didi_invoke_rpa_bot(rpa_bot_file, rpa_bot = 'reference/S-IPA-Workshop/TagUI-S-IPA/src/tagui'):
def didi_invoke_rpa_bot(rpa_bot_file, rpa_bot = '../reference/S-IPA-Workshop/TagUI-S-IPA/src/tagui'):

# Invoke RPA-Bot script
    print('[ W I P ] In progress to invoke RPA-Bot using command: \n{}'.format(
            'bash' + ' ' + rpa_bot + ' ' + rpa_bot_file))
    start = time.time()
    return_code = subprocess.call(['bash', rpa_bot, rpa_bot_file])
    end = time.time()
    if return_code == 0:
        print('[  Sync OK  ] RPA-Bot succeeded! [ Return Code : {} ]'.format(return_code))
    else:
        print('[ ERROR ] RPA-Bot failed! [ Return Code : {} ]'.format(return_code))

    return return_code, int(round(end - start, 0)) # return_code & time_spent in seconds

# Uncomment below lines for an agile demo outside Chat-bot:
# rpa_bot_file = '../reference/S-IPA-Workshop/workshop2/KIE-Loan-Application-WeChat/VA-KIE-Loan-Application.txt'
# return_code = didi_invoke_rpa_bot(rpa_bot_file)
Given the above code, generate some markdown instructions for it.
assistant
#Here is the Python code you requested.

<span style="color:blue">Virtual Worker: When Chat-bot meets RPA-bot</span>
虚拟员工: 贷款填表申请审批一条龙自动化流程 （Mortgage loan application automation)
Synchronous processing when triggering RPA-Bot