【发布时间】：2017-04-27 04:23:03
【问题描述】：
我遇到了这个讨厌的错误：
Traceback (most recent call last):
File "scrapeRecipe.py", line 29, in <module>
br.select_form(name="aspnetForm")
File "build/bdist.macosx-10.11-intel/egg/mechanize/_mechanize.py", line 619, in select_form
File "build/bdist.macosx-10.11-intel/egg/mechanize/_html.py", line 260, in global_form
File "build/bdist.macosx-10.11-intel/egg/mechanize/_html.py", line 267, in forms
File "build/bdist.macosx-10.11-intel/egg/mechanize/_html.py", line 282, in _get_forms
File "build/bdist.macosx-10.11-intel/egg/mechanize/_html.py", line 247, in root
File "build/bdist.macosx-10.11-intel/egg/mechanize/_html.py", line 145, in content_parser
ImportError: No module named html5lib
我试图了解 Traceback 为何查看这些文件。此外，当我做locate build/bdist.macosx-10.11-intel/egg/mechanize/_mechanize.py 时，它告诉我它不存在。
我假设我收到此模块未找到错误，因为 html5lib 模块位于 /Library/Python/2.7/site-packages/pip-9.0.1-py2.7.egg/pip/_vendor/html5lib。
问题：我们可以控制回溯的位置吗？此外，我的 sys.path 目前是
['/Users/madelinezechar/eatLowCarbon', '/Library/Python/2.7/site-
packages/BeautifulSoup-3.2.1-py2.7.egg', '/Library/Python/2.7/site-
packages/html2text-2016.9.19-py2.7.egg', '/Library/Python/2.7/site-
packages/mechanize-0.3.1-py2.7.egg', '/Library/Python/2.7/site-
packages/requests-2.13.0-py2.7.egg', '/Library/Python/2.7/site-
packages/pip-9.0.1-py2.7.egg',
'/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python27.zip',
'/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7', '/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/plat-darwin', '/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/plat-mac', '/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/plat-mac/lib-scriptpackages', '/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python', '/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-tk', '/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-old', '/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-dynload',
'/Users/madelinezechar/Library/Python/2.7/lib/python/site-packages', '/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/PyObjC',
'/Library/Python/2.7/site-packages']
我使用命令easy_install html5lib 安装了html5lib。当我运行它时，我收到以下消息：
Adding html5lib 0.999999999 to easy-install.pth file
Using /Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages
Processing dependencies for html5lib
Finished processing dependencies for html5lib
当我的 sys.path 正在查看 2.7 并且我的 python 代码在 2.7 上运行时，我担心它使用 python 3.5。此外，我的 easy_install.pth 似乎没有 html5lib，即使在安装之后：
import sys; sys.__plen = len(sys.path)
./BeautifulSoup-3.2.1-py2.7.egg
./html2text-2016.9.19-py2.7.egg
./mechanize-0.3.1-py2.7.egg
./requests-2.13.0-py2.7.egg
./pip-9.0.1-py2.7.egg
import sys; new=sys.path[sys.__plen:]; del sys.path[sys.__plen:]; p=getattr(sys,'__egginsert',0); sys.path[p:p]=new; sys.__egginsert = p+len(new)
当我运行 pip3 freeze 时，我看到列出了 html5lib。当我运行pip freeze 时，我没有。如果我尝试sudo pip install html5lib，我会收到这条丑陋的消息：
这个错误信息是什么意思？当我知道html5lib.py 在Python/2.7/site-packages/bs4/builder 中时，pip freeze 怎么可能不返回html5lib？
【问题讨论】：
-
您是如何安装该模块的？请注意，Traceback 并不查看模块本身，它只是帮助定位异常的工具。在执行
import <module>时，是 Python 本身在寻找必要的模块 -
我使用“easy_install html5lib”安装了 html5lib。当我运行该命令时，它显示
Adding html5lib 0.999999999 to easy-install.pth file Using /Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages Processing dependencies for html5lib。 -
检查模块是否安装的最简单方法是在解释器中尝试
import <module>。如果它什么也没说，则模块已安装。如果有例外......你知道演习。也许你可以试试这种检查方法？ -
没有例外，但我也一样，
ImportError: No module named html5lib -
这是一个例外 :) 这意味着该模块仍然没有安装。不能用
pip安装吗？
标签： python python-2.7 sys traceback