python的browser指令写在命令行执行和在脚本中，出现不同的结果？

在windows环境中的python3命令行中执行如下三条指令:

>>> from splinter.browser import Browser

>>> b = Browser("firefox")

>>> b.visit("https://www.baidu.com";)

执行能成功，但是把这3句写成脚本bigpangzi.py的形式执行就会出错。脚本内容如下：

#-*- coding: utf-8- -*-

from splinter.browser import Browser

b = Browser("firefox")

b.visit("https://www.baidu.com";)

错误如下：

C:\Users\Dell>python e:/python/bigpangzi.py

tar -zcvf /tmpbak\20170807.zip /tmp/*

'tar' 不是内部或外部命令，也不是可运行的程序

或批处理文件。

Failed

Traceback (most recent call last):

File "e:/python/bigpangzi.py", line 6, in <module>

b = Browser("firefox")

File "C:\Users\Dell\AppData\Local\Programs\Python\Python35-32\lib\site-packages\splinter-0.7.6-py3.5.egg\splinter\browser.py", line 63, in Browser

File "C:\Users\Dell\AppData\Local\Programs\Python\Python35-32\lib\site-packages\splinter-0.7.6-py3.5.egg\splinter\driver\webdriver\firefox.py", line 24, in __init__

File "C:\Users\Dell\AppData\Local\Programs\Python\Python35-32\lib\site-packages\selenium-3.4.3-py3.5.egg\selenium\webdriver\firefox\firefox_profile.py", line 67, in __init__

self.default_preferences = copy.deepcopy(

AttributeError: module 'copy' has no attribute 'deepcopy'

求大神解答。