机器学习爬坑之路1 python2.7 安装库提示编码有问题

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教程太老了吧，虽然我报的是最新的课程，但是教程里还是选择了中文兼容不是很好的python版本 2.7，放着好好的python3.* 不用，

果然安装做作业用到的库的时候遇到坑了

C:\Users>python -m pip install numpy
Collecting numpy
Exception:
Traceback (most recent call last):
  File "D:\programfiles\python27\lib\site-packages\pip\basecommand.py", line 215, in main
    status = self.run(options, args)
  File "D:\programfiles\python27\lib\site-packages\pip\commands\install.py", line 324, in run
    requirement_set.prepare_files(finder)
  File "D:\programfiles\python27\lib\site-packages\pip\req\req_set.py", line 380, in prepare_files
    ignore_dependencies=self.ignore_dependencies))
  File "D:\programfiles\python27\lib\site-packages\pip\req\req_set.py", line 620, in _prepare_file
    session=self.session, hashes=hashes)
  File "D:\programfiles\python27\lib\site-packages\pip\download.py", line 821, in unpack_url
    hashes=hashes
  File "D:\programfiles\python27\lib\site-packages\pip\download.py", line 659, in unpack_http_url
    hashes)
  File "D:\programfiles\python27\lib\site-packages\pip\download.py", line 880, in _download_http_url
    file_path = os.path.join(temp_dir, filename)
  File "D:\programfiles\python27\lib\ntpath.py", line 89, in join
    result_path = result_path + p_path

UnicodeDecodeError: 'ascii codec can't decode byte 0xc2 in position 7: invalid continuation byte

到网上找资料说是改下 ntpath 里的文件开头加上

reload(sys)

sys.setdefaultencoding('utf8')

就好了

骗子！

自己摸索着发现正确的方法应该是这样

reload(sys)

sys.setdefaultencoding('gbk')