问如何在没有交互模式的情况下调用在另一个.py文件中定义的python函数

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C:\Python27\modbus_simulator>modbus_master.py
Traceback (most recent call last):
File "C:\Python27\modbus_master.py", line 3, in <module>
import modbus_helpers
ImportError: No module named modbus_helpers

C:\Python27\modbus_simulator>python
Python 2.7.5 (default, May 15 2013, 22:43:36) MSC v.1500 32 bit (Intel)  on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import modbus_master

import sys
import json
import modbus_helpers
import os

def printRegsets():
    print 'these register sets were piped in...\r\n'
    regsetIndex = 0
    for regset in registersetsList:
        print str(regsetIndex) , ':', regset['Name']
        regsetIndex = regsetIndex + 1

path = os.path.normpath('C:\Python27\modbus_simulator\export2.txt')
registersetsList = modbus_helpers.getRegisterSetFromACMExportFile(path)
printRegsets()