I get 'ImportError: No module named web' despite the fact that it is installed
I get 'ImportError: No module named web' despite the fact that it is installed
我想要 运行 一个简单的 'Hello world' 应用程序。每次我 运行 我得到
'ImportError: No module named web'
我使用 pip 安装了 web.py，并多次使用 easy_install。我尝试卸载它并重新安装。我尝试将它安装为 sudo。似乎没有任何效果。我用 OS X
申请代码：
import web
urls = (
'/', 'index'
)
app = web.application(urls, globals())
class index:
def GET(self):
greeting = "Hello World"
return greeting
if __name__ == "__main__":
app.run()
我尝试运行这个应用程序使用这个推荐：
python /Users/mptorz/webversion/bin/app.py http://0.0.0.0:8080/
但是我知道这不是代码的问题，因为我基本上是在做这个课程http://learnpythonthehardway.org/book/ex50.html。
我认为这可能很有趣。我刚刚再次尝试重新安装 web.py，但出现此错误：
pc7:~ mptorz$ pip uninstall web.py
Uninstalling web.py-0.40.dev0:
/usr/local/lib/python2.7/site-packages/web.py-0.40.dev0-py2.7.egg
Proceed (y/n)? y
Exception:
Traceback (most recent call last):
File "/usr/local/lib/python2.7/site-packages/pip/basecommand.py", line 215, in main
status = self.run(options, args)
File "/usr/local/lib/python2.7/site-packages/pip/commands/uninstall.py", line 76, in run
requirement_set.uninstall(auto_confirm=options.yes)
File "/usr/local/lib/python2.7/site-packages/pip/req/req_set.py", line 336, in uninstall
req.uninstall(auto_confirm=auto_confirm)
File "/usr/local/lib/python2.7/site-packages/pip/req/req_install.py", line 742, in uninstall
paths_to_remove.remove(auto_confirm)
File "/usr/local/lib/python2.7/site-packages/pip/req/req_uninstall.py", line 115, in remove
renames(path, new_path)
File "/usr/local/lib/python2.7/site-packages/pip/utils/__init__.py", line 267, in renames
shutil.move(old, new)
File "/usr/local/Cellar/python/2.7.12/Frameworks/Python.framework/Versions/2.7/lib/python2.7/shutil.py", line 300, in move
rmtree(src)
File "/usr/local/Cellar/python/2.7.12/Frameworks/Python.framework/Versions/2.7/lib/python2.7/shutil.py", line 247, in rmtree
rmtree(fullname, ignore_errors, onerror)
File "/usr/local/Cellar/python/2.7.12/Frameworks/Python.framework/Versions/2.7/lib/python2.7/shutil.py", line 252, in rmtree
onerror(os.remove, fullname, sys.exc_info())
File "/usr/local/Cellar/python/2.7.12/Frameworks/Python.framework/Versions/2.7/lib/python2.7/shutil.py", line 250, in rmtree
os.remove(fullname)
OSError: [Errno 13] Permission denied: '/usr/local/lib/python2.7/site-packages/web.py-0.40.dev0-py2.7.egg/EGG-INFO/dependency_links.txt'
我尝试对 sudo 执行相同的操作，但出现此错误。
pc7:~ mptorz$ sudo pip uninstall web.py
Password:
The directory '/Users/mptorz/Library/Caches/pip/http' or its parent directory is not owned by the current user and the cache has been disabled. Please check the permissions and owner of that directory. If executing pip with sudo, you may want sudo's -H flag.
Uninstalling web.py-0.40.dev0:
/usr/local/lib/python2.7/site-packages/web.py-0.40.dev0-py2.7.egg
Proceed (y/n)? y
Successfully uninstalled web.py-0.40.dev0
The directory '/Users/mptorz/Library/Caches/pip/http' or its parent directory is not owned by the current user and the cache has been disabled. Please check the permissions and owner of that directory. If executing pip with sudo, you may want sudo's -H flag.
然后我尝试这样做：
pc7:~ mptorz$ sudo pip install web.py
The directory '/Users/mptorz/Library/Caches/pip/http' or its parent directory is not owned by the current user and the cache has been disabled. Please check the permissions and owner of that directory. If executing pip with sudo, you may want sudo's -H flag.
The directory '/Users/mptorz/Library/Caches/pip' or its parent directory is not owned by the current user and caching wheels has been disabled. check the permissions and owner of that directory. If executing pip with sudo, you may want sudo's -H flag.
Collecting web.py
Downloading web.py-0.38.tar.gz (91kB)
100% |████████████████████████████████| 92kB 199kB/s
Installing collected packages: web.py
Running setup.py install for web.py ... done
Successfully installed web.py-0.38
当我 运行 应用程序时，我仍然遇到相同的错误 'ImportError: No module named web'。
我被要求添加 python -c "print(import('sys').path)":
的结果
pc7:~ mptorz$ python -c "print(__import__('sys').path)"
['', '/Library/Python/2.7/site-packages/pip-8.1.2-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', '/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/PyObjC', '/Library/Python/2.7/site-packages']
Somone 还建议尝试 "python -m pip install web.py"
它导致了这个错误：
pc7:~ mptorz$ python -m pip install web.py
Collecting web.py
Downloading web.py-0.38.tar.gz (91kB)
100% |████████████████████████████████| 92kB 215kB/s
Installing collected packages: web.py
Running setup.py install for web.py ... error
Complete output from command /usr/bin/python -u -c "import setuptools, tokenize;__file__='/private/var/folders/w6/f08g43wn1zg6ny5b_lq414cr0000gn/T/pip-build-pn7SCD/web.py/setup.py';exec(compile(getattr(tokenize, 'open', open)(__file__).read().replace('\r\n', '\n'), __file__, 'exec'))" install --record /var/folders/w6/f08g43wn1zg6ny5b_lq414cr0000gn/T/pip-tBblX5-record/install-record.txt --single-version-externally-managed --compile:
running install
running build
running build_py
creating build
creating build/lib
creating build/lib/web
copying web/__init__.py -> build/lib/web
copying web/application.py -> build/lib/web
copying web/browser.py -> build/lib/web
copying web/db.py -> build/lib/web
copying web/debugerror.py -> build/lib/web
copying web/form.py -> build/lib/web
copying web/http.py -> build/lib/web
copying web/httpserver.py -> build/lib/web
copying web/net.py -> build/lib/web
copying web/python23.py -> build/lib/web
copying web/session.py -> build/lib/web
copying web/template.py -> build/lib/web
copying web/test.py -> build/lib/web
copying web/utils.py -> build/lib/web
copying web/webapi.py -> build/lib/web
copying web/webopenid.py -> build/lib/web
copying web/wsgi.py -> build/lib/web
creating build/lib/web/wsgiserver
copying web/wsgiserver/__init__.py -> build/lib/web/wsgiserver
copying web/wsgiserver/ssl_builtin.py -> build/lib/web/wsgiserver
copying web/wsgiserver/ssl_pyopenssl.py -> build/lib/web/wsgiserver
creating build/lib/web/contrib
copying web/contrib/__init__.py -> build/lib/web/contrib
copying web/contrib/template.py -> build/lib/web/contrib
running install_lib
creating /Library/Python/2.7/site-packages/web
error: could not create '/Library/Python/2.7/site-packages/web': Permission denied
----------------------------------------
Command "/usr/bin/python -u -c "import setuptools, tokenize;__file__='/private/var/folders/w6/f08g43wn1zg6ny5b_lq414cr0000gn/T/pip-build-pn7SCD/web.py/setup.py';exec(compile(getattr(tokenize, 'open', open)(__file__).read().replace('\r\n', '\n'), __file__, 'exec'))" install --record /var/folders/w6/f08g43wn1zg6ny5b_lq414cr0000gn/T/pip-tBblX5-record/install-record.txt --single-version-externally-managed --compile" failed with error code 1 in /private/var/folders/w6/f08g43wn1zg6ny5b_lq414cr0000gn/T/pip-build-pn7SCD/web.py/
在完成此处建议的所有操作后，我再次尝试 运行 应用程序，我得到了这个：
pc7:~ mptorz$ python /Users/mptorz/webversion/bin/app.py http://0.0.0.0:8080/
Traceback (most recent call last):
File "/Users/mptorz/webversion/bin/app.py", line 15, in <module>
app.run()
File "/Library/Python/2.7/site-packages/web/application.py", line 313, in run
return wsgi.runwsgi(self.wsgifunc(*middleware))
File "/Library/Python/2.7/site-packages/web/wsgi.py", line 55, in runwsgi
server_addr = validip(listget(sys.argv, 1, ''))
File "/Library/Python/2.7/site-packages/web/net.py", line 125, in validip
port = int(port)
ValueError: invalid literal for int() with base 10: '//0.0.0.0:8080/'
我刚刚尝试了@PhilipTzou 建议的自制解决方案。在我这样做之后 运行ning 应用程序的输出是：
pc7:~ mptorz$ python /Users/mptorz/webversion/bin/app.py http://0.0.0.0:8080/
Traceback (most recent call last):
File "/Users/mptorz/webversion/bin/app.py", line 1, in <module>
import web
File "/usr/local/lib/python2.7/site-packages/web/__init__.py", line 14, in <module>
import utils, db, net, wsgi, http, webapi, httpserver, debugerror
File "/usr/local/lib/python2.7/site-packages/web/wsgi.py", line 8, in <module>
import http
File "/usr/local/lib/python2.7/site-packages/web/http.py", line 16, in <module>
import net, utils, webapi as web
File "/usr/local/lib/python2.7/site-packages/web/webapi.py", line 31, in <module>
import sys, cgi, Cookie, pprint, urlparse, urllib
File "/usr/local/Cellar/python/2.7.12/Frameworks/Python.framework/Versions/2.7/lib/python2.7/cgi.py", line 50, in <module>
import mimetools
File "/usr/local/Cellar/python/2.7.12/Frameworks/Python.framework/Versions/2.7/lib/python2.7/mimetools.py", line 6, in <module>
import tempfile
File "/usr/local/Cellar/python/2.7.12/Frameworks/Python.framework/Versions/2.7/lib/python2.7/tempfile.py", line 32, in <module>
import io as _io
File "/usr/local/Cellar/python/2.7.12/Frameworks/Python.framework/Versions/2.7/lib/python2.7/io.py", line 51, in <module>
import _io
ImportError: dlopen(/usr/local/Cellar/python/2.7.12/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-dynload/_io.so, 2): Symbol not found: __PyCodecInfo_GetIncrementalDecoder
Referenced from: /usr/local/Cellar/python/2.7.12/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-dynload/_io.so
Expected in: flat namespace
in /usr/local/Cellar/python/2.7.12/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-dynload/_io.so
解决方案
最后，它奏效了。 运行使用@PhilipTzou 建议的解决方案并输入 python /Users/mptorz/webversion/bin/app.py 8080 app.py 后，我终于可以继续我的 python 课程了。谢谢大家的帮助:)
根据您的 sys.path 的输出，您可能正在使用 OSX Python 到 运行 您的脚本 (app.py) 但使用 Homebrew Python执行PIP命令。解决方案非常简单：
brew link --overwrite python
这将 change your default Python to Homebrew one。执行此命令后，您可以通过键入以下命令来验证您使用的是 Homebrew Python：
which -a python
结果应该是这样的（顺序很重要）：
/usr/local/bin/python
/usr/bin/python
否则您可以尝试在命令提示符下使用 python -m pip install lpthw.web，这对我有用。
我想要 运行 一个简单的 'Hello world' 应用程序。每次我 运行 我得到
'ImportError: No module named web'
我使用 pip 安装了 web.py，并多次使用 easy_install。我尝试卸载它并重新安装。我尝试将它安装为 sudo。似乎没有任何效果。我用 OS X
申请代码：
import web
urls = (
'/', 'index'
)
app = web.application(urls, globals())
class index:
def GET(self):
greeting = "Hello World"
return greeting
if __name__ == "__main__":
app.run()
我尝试运行这个应用程序使用这个推荐：
python /Users/mptorz/webversion/bin/app.py http://0.0.0.0:8080/
但是我知道这不是代码的问题，因为我基本上是在做这个课程http://learnpythonthehardway.org/book/ex50.html。
我认为这可能很有趣。我刚刚再次尝试重新安装 web.py，但出现此错误：
pc7:~ mptorz$ pip uninstall web.py
Uninstalling web.py-0.40.dev0:
/usr/local/lib/python2.7/site-packages/web.py-0.40.dev0-py2.7.egg
Proceed (y/n)? y
Exception:
Traceback (most recent call last):
File "/usr/local/lib/python2.7/site-packages/pip/basecommand.py", line 215, in main
status = self.run(options, args)
File "/usr/local/lib/python2.7/site-packages/pip/commands/uninstall.py", line 76, in run
requirement_set.uninstall(auto_confirm=options.yes)
File "/usr/local/lib/python2.7/site-packages/pip/req/req_set.py", line 336, in uninstall
req.uninstall(auto_confirm=auto_confirm)
File "/usr/local/lib/python2.7/site-packages/pip/req/req_install.py", line 742, in uninstall
paths_to_remove.remove(auto_confirm)
File "/usr/local/lib/python2.7/site-packages/pip/req/req_uninstall.py", line 115, in remove
renames(path, new_path)
File "/usr/local/lib/python2.7/site-packages/pip/utils/__init__.py", line 267, in renames
shutil.move(old, new)
File "/usr/local/Cellar/python/2.7.12/Frameworks/Python.framework/Versions/2.7/lib/python2.7/shutil.py", line 300, in move
rmtree(src)
File "/usr/local/Cellar/python/2.7.12/Frameworks/Python.framework/Versions/2.7/lib/python2.7/shutil.py", line 247, in rmtree
rmtree(fullname, ignore_errors, onerror)
File "/usr/local/Cellar/python/2.7.12/Frameworks/Python.framework/Versions/2.7/lib/python2.7/shutil.py", line 252, in rmtree
onerror(os.remove, fullname, sys.exc_info())
File "/usr/local/Cellar/python/2.7.12/Frameworks/Python.framework/Versions/2.7/lib/python2.7/shutil.py", line 250, in rmtree
os.remove(fullname)
OSError: [Errno 13] Permission denied: '/usr/local/lib/python2.7/site-packages/web.py-0.40.dev0-py2.7.egg/EGG-INFO/dependency_links.txt'
我尝试对 sudo 执行相同的操作，但出现此错误。
pc7:~ mptorz$ sudo pip uninstall web.py
Password:
The directory '/Users/mptorz/Library/Caches/pip/http' or its parent directory is not owned by the current user and the cache has been disabled. Please check the permissions and owner of that directory. If executing pip with sudo, you may want sudo's -H flag.
Uninstalling web.py-0.40.dev0:
/usr/local/lib/python2.7/site-packages/web.py-0.40.dev0-py2.7.egg
Proceed (y/n)? y
Successfully uninstalled web.py-0.40.dev0
The directory '/Users/mptorz/Library/Caches/pip/http' or its parent directory is not owned by the current user and the cache has been disabled. Please check the permissions and owner of that directory. If executing pip with sudo, you may want sudo's -H flag.
然后我尝试这样做：
pc7:~ mptorz$ sudo pip install web.py
The directory '/Users/mptorz/Library/Caches/pip/http' or its parent directory is not owned by the current user and the cache has been disabled. Please check the permissions and owner of that directory. If executing pip with sudo, you may want sudo's -H flag.
The directory '/Users/mptorz/Library/Caches/pip' or its parent directory is not owned by the current user and caching wheels has been disabled. check the permissions and owner of that directory. If executing pip with sudo, you may want sudo's -H flag.
Collecting web.py
Downloading web.py-0.38.tar.gz (91kB)
100% |████████████████████████████████| 92kB 199kB/s
Installing collected packages: web.py
Running setup.py install for web.py ... done
Successfully installed web.py-0.38
当我 运行 应用程序时，我仍然遇到相同的错误 'ImportError: No module named web'。
我被要求添加 python -c "print(import('sys').path)":
的结果pc7:~ mptorz$ python -c "print(__import__('sys').path)"
['', '/Library/Python/2.7/site-packages/pip-8.1.2-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', '/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/PyObjC', '/Library/Python/2.7/site-packages']
Somone 还建议尝试 "python -m pip install web.py" 它导致了这个错误：
pc7:~ mptorz$ python -m pip install web.py
Collecting web.py
Downloading web.py-0.38.tar.gz (91kB)
100% |████████████████████████████████| 92kB 215kB/s
Installing collected packages: web.py
Running setup.py install for web.py ... error
Complete output from command /usr/bin/python -u -c "import setuptools, tokenize;__file__='/private/var/folders/w6/f08g43wn1zg6ny5b_lq414cr0000gn/T/pip-build-pn7SCD/web.py/setup.py';exec(compile(getattr(tokenize, 'open', open)(__file__).read().replace('\r\n', '\n'), __file__, 'exec'))" install --record /var/folders/w6/f08g43wn1zg6ny5b_lq414cr0000gn/T/pip-tBblX5-record/install-record.txt --single-version-externally-managed --compile:
running install
running build
running build_py
creating build
creating build/lib
creating build/lib/web
copying web/__init__.py -> build/lib/web
copying web/application.py -> build/lib/web
copying web/browser.py -> build/lib/web
copying web/db.py -> build/lib/web
copying web/debugerror.py -> build/lib/web
copying web/form.py -> build/lib/web
copying web/http.py -> build/lib/web
copying web/httpserver.py -> build/lib/web
copying web/net.py -> build/lib/web
copying web/python23.py -> build/lib/web
copying web/session.py -> build/lib/web
copying web/template.py -> build/lib/web
copying web/test.py -> build/lib/web
copying web/utils.py -> build/lib/web
copying web/webapi.py -> build/lib/web
copying web/webopenid.py -> build/lib/web
copying web/wsgi.py -> build/lib/web
creating build/lib/web/wsgiserver
copying web/wsgiserver/__init__.py -> build/lib/web/wsgiserver
copying web/wsgiserver/ssl_builtin.py -> build/lib/web/wsgiserver
copying web/wsgiserver/ssl_pyopenssl.py -> build/lib/web/wsgiserver
creating build/lib/web/contrib
copying web/contrib/__init__.py -> build/lib/web/contrib
copying web/contrib/template.py -> build/lib/web/contrib
running install_lib
creating /Library/Python/2.7/site-packages/web
error: could not create '/Library/Python/2.7/site-packages/web': Permission denied
----------------------------------------
Command "/usr/bin/python -u -c "import setuptools, tokenize;__file__='/private/var/folders/w6/f08g43wn1zg6ny5b_lq414cr0000gn/T/pip-build-pn7SCD/web.py/setup.py';exec(compile(getattr(tokenize, 'open', open)(__file__).read().replace('\r\n', '\n'), __file__, 'exec'))" install --record /var/folders/w6/f08g43wn1zg6ny5b_lq414cr0000gn/T/pip-tBblX5-record/install-record.txt --single-version-externally-managed --compile" failed with error code 1 in /private/var/folders/w6/f08g43wn1zg6ny5b_lq414cr0000gn/T/pip-build-pn7SCD/web.py/
在完成此处建议的所有操作后，我再次尝试 运行 应用程序，我得到了这个：
pc7:~ mptorz$ python /Users/mptorz/webversion/bin/app.py http://0.0.0.0:8080/
Traceback (most recent call last):
File "/Users/mptorz/webversion/bin/app.py", line 15, in <module>
app.run()
File "/Library/Python/2.7/site-packages/web/application.py", line 313, in run
return wsgi.runwsgi(self.wsgifunc(*middleware))
File "/Library/Python/2.7/site-packages/web/wsgi.py", line 55, in runwsgi
server_addr = validip(listget(sys.argv, 1, ''))
File "/Library/Python/2.7/site-packages/web/net.py", line 125, in validip
port = int(port)
ValueError: invalid literal for int() with base 10: '//0.0.0.0:8080/'
我刚刚尝试了@PhilipTzou 建议的自制解决方案。在我这样做之后 运行ning 应用程序的输出是：
pc7:~ mptorz$ python /Users/mptorz/webversion/bin/app.py http://0.0.0.0:8080/
Traceback (most recent call last):
File "/Users/mptorz/webversion/bin/app.py", line 1, in <module>
import web
File "/usr/local/lib/python2.7/site-packages/web/__init__.py", line 14, in <module>
import utils, db, net, wsgi, http, webapi, httpserver, debugerror
File "/usr/local/lib/python2.7/site-packages/web/wsgi.py", line 8, in <module>
import http
File "/usr/local/lib/python2.7/site-packages/web/http.py", line 16, in <module>
import net, utils, webapi as web
File "/usr/local/lib/python2.7/site-packages/web/webapi.py", line 31, in <module>
import sys, cgi, Cookie, pprint, urlparse, urllib
File "/usr/local/Cellar/python/2.7.12/Frameworks/Python.framework/Versions/2.7/lib/python2.7/cgi.py", line 50, in <module>
import mimetools
File "/usr/local/Cellar/python/2.7.12/Frameworks/Python.framework/Versions/2.7/lib/python2.7/mimetools.py", line 6, in <module>
import tempfile
File "/usr/local/Cellar/python/2.7.12/Frameworks/Python.framework/Versions/2.7/lib/python2.7/tempfile.py", line 32, in <module>
import io as _io
File "/usr/local/Cellar/python/2.7.12/Frameworks/Python.framework/Versions/2.7/lib/python2.7/io.py", line 51, in <module>
import _io
ImportError: dlopen(/usr/local/Cellar/python/2.7.12/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-dynload/_io.so, 2): Symbol not found: __PyCodecInfo_GetIncrementalDecoder
Referenced from: /usr/local/Cellar/python/2.7.12/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-dynload/_io.so
Expected in: flat namespace
in /usr/local/Cellar/python/2.7.12/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-dynload/_io.so
解决方案
最后，它奏效了。 运行使用@PhilipTzou 建议的解决方案并输入 python /Users/mptorz/webversion/bin/app.py 8080 app.py 后，我终于可以继续我的 python 课程了。谢谢大家的帮助:)
根据您的 sys.path 的输出，您可能正在使用 OSX Python 到 运行 您的脚本 (app.py) 但使用 Homebrew Python执行PIP命令。解决方案非常简单：
brew link --overwrite python
这将 change your default Python to Homebrew one。执行此命令后，您可以通过键入以下命令来验证您使用的是 Homebrew Python：
which -a python
结果应该是这样的（顺序很重要）：
/usr/local/bin/python
/usr/bin/python
否则您可以尝试在命令提示符下使用 python -m pip install lpthw.web，这对我有用。