我尝试安装/升级scrapy，它说安装了verison 0.24。然而，当我尝试使用它时，它无法识别像爬行等新版本的命令，即它仍然停留在旧版本。该怎么办？
Collecting scrapy from https://pypi.python.org/packages/2.7/S/Scrapy/Scrapy-0.24.5-py2-none-any.whl#md5=f4da05854ea6ea0692b665c1758f0dfe
Downloading Scrapy-0.24.5-py2-none-any.whl (444kB)
100% |################################| 446kB 343kB/s
Requirement already up-to-date: cssselect>=0.9 in /usr/local/lib/python2.7/dist-packages (from scrapy)
Requirement already up-to-date: queuelib in /usr/local/lib/python2.7/dist-packages (from scrapy)
Requirement already up-to-date: pyOpenSSL in /usr/local/lib/python2.7/dist-packages (from scrapy)
Requirement already up-to-date: w3lib>=1.8.0 in /usr/local/lib/python2.7/dist-packages (from scrapy)
Requirement already up-to-date: lxml in /usr/local/lib/python2.7/dist-packages (from scrapy)
Requirement already up-to-date: Twisted>=10.0.0 in /usr/local/lib/python2.7/dist-packages (from scrapy)
Requirement already up-to-date: six>=1.5.2 in /usr/local/lib/python2.7/dist-packages (from scrapy)
Requirement already up-to-date: cryptography>=0.2.1 in /usr/local/lib/python2.7/dist-packages (from pyOpenSSL->scrapy)
Requirement already up-to-date: zope.interface>=3.6.0 in /usr/local/lib/python2.7/dist-packages (from Twisted>=10.0.0->scrapy)
Requirement already up-to-date: cffi>=0.8 in /usr/local/lib/python2.7/dist-packages (from cryptography>=0.2.1->pyOpenSSL->scrapy)
Requirement already up-to-date: pyasn1 in /usr/local/lib/python2.7/dist-packages (from cryptography>=0.2.1->pyOpenSSL->scrapy)
Requirement already up-to-date: setuptools in /usr/local/lib/python2.7/dist-packages (from cryptography>=0.2.1->pyOpenSSL->scrapy)
Requirement already up-to-date: enum34 in /usr/local/lib/python2.7/dist-packages (from cryptography>=0.2.1->pyOpenSSL->scrapy)
Requirement already up-to-date: pycparser in /usr/local/lib/python2.7/dist-packages (from cffi>=0.8->cryptography>=0.2.1->pyOpenSSL->scrapy)
Installing collected packages: scrapy
Found existing installation: Scrapy 0.12.0.2546
DEPRECATION: Uninstalling a distutils installed project (scrapy) has been deprecated and will be removed in a future version. This is due to the fact that uninstalling a distutils project will only partially uninstall the project.
Can't uninstall 'Scrapy'. No files were found to uninstall.
Successfully installed scrapy-0.24.5
scrapy --version
Scrapy 0.12.0.2546 - no active project