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为什么Python 3.6.1抛出AttributeError：模块’enum’没有属性’IntFlag’？

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问题：为什么Python 3.6.1抛出AttributeError：模块’enum’没有属性’IntFlag’？
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问题：为什么Python 3.6.1抛出AttributeError：模块’enum’没有属性’IntFlag’？

我刚刚为MacOS X安装了Python 3.6.1

当我尝试运行控制台（或使用Python3运行任何命令）时，抛出此错误：

  AttributeError: module 'enum' has no attribute 'IntFlag'

$ /Library/Frameworks/Python.framework/Versions/3.6/bin/python3  
Failed to import the site module  
Traceback (most recent call last):  
  File "/usr/local/Cellar/python3/3.6.1/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site.py", line 544, in <module>  
    main()  
  File "/usr/local/Cellar/python3/3.6.1/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site.py", line 530, in main  
    known_paths = addusersitepackages(known_paths)  
  File "/usr/local/Cellar/python3/3.6.1/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site.py", line 282, in addusersitepackages  
    user_site = getusersitepackages()  
  File "/usr/local/Cellar/python3/3.6.1/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site.py", line 258, in getusersitepackages  
    user_base = getuserbase() # this will also set USER_BASE  
  File "/usr/local/Cellar/python3/3.6.1/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site.py", line 248, in getuserbase  
    USER_BASE = get_config_var('userbase')  
  File "/usr/local/Cellar/python3/3.6.1/Frameworks/Python.framework/Versions/3.6/lib/python3.6/sysconfig.py", line 601, in get_config_var  
    return get_config_vars().get(name)  
  File "/usr/local/Cellar/python3/3.6.1/Frameworks/Python.framework/Versions/3.6/lib/python3.6/sysconfig.py", line 580, in get_config_vars  
    import _osx_support  
  File "/usr/local/Cellar/python3/3.6.1/Frameworks/Python.framework/Versions/3.6/lib/python3.6/_osx_support.py", line 4, in <module>  
    import re  
  File "/usr/local/Cellar/python3/3.6.1/Frameworks/Python.framework/Versions/3.6/lib/python3.6/re.py", line 142, in <module>  
    class RegexFlag(enum.IntFlag):  
AttributeError: module 'enum' has no attribute 'IntFlag'

IntFlag类存在于enum.py中。那么，为什么会抛出AttributeError？

点击查看英文原文

I just installed Python 3.6.1 for MacOS X

When I attempt to run the Console(or run anything with Python3), this error is thrown:

  AttributeError: module 'enum' has no attribute 'IntFlag'

$ /Library/Frameworks/Python.framework/Versions/3.6/bin/python3  
Failed to import the site module  
Traceback (most recent call last):  
  File "/usr/local/Cellar/python3/3.6.1/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site.py", line 544, in <module>  
    main()  
  File "/usr/local/Cellar/python3/3.6.1/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site.py", line 530, in main  
    known_paths = addusersitepackages(known_paths)  
  File "/usr/local/Cellar/python3/3.6.1/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site.py", line 282, in addusersitepackages  
    user_site = getusersitepackages()  
  File "/usr/local/Cellar/python3/3.6.1/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site.py", line 258, in getusersitepackages  
    user_base = getuserbase() # this will also set USER_BASE  
  File "/usr/local/Cellar/python3/3.6.1/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site.py", line 248, in getuserbase  
    USER_BASE = get_config_var('userbase')  
  File "/usr/local/Cellar/python3/3.6.1/Frameworks/Python.framework/Versions/3.6/lib/python3.6/sysconfig.py", line 601, in get_config_var  
    return get_config_vars().get(name)  
  File "/usr/local/Cellar/python3/3.6.1/Frameworks/Python.framework/Versions/3.6/lib/python3.6/sysconfig.py", line 580, in get_config_vars  
    import _osx_support  
  File "/usr/local/Cellar/python3/3.6.1/Frameworks/Python.framework/Versions/3.6/lib/python3.6/_osx_support.py", line 4, in <module>  
    import re  
  File "/usr/local/Cellar/python3/3.6.1/Frameworks/Python.framework/Versions/3.6/lib/python3.6/re.py", line 142, in <module>  
    class RegexFlag(enum.IntFlag):  
AttributeError: module 'enum' has no attribute 'IntFlag'

The class IntFlag exists within enum.py. So, why is the AttributeError being thrown?

回答 0

这是因为您enum不是标准库enum模块。您可能已经enum34安装了软件包。

检查是否属于这种情况的一种方法是检查物业 enum.__file__

import enum
print(enum.__file__)  
# standard library location should be something like 
# /usr/local/lib/python3.6/enum.py

从python 3.6开始，enum34库不再与标准库兼容。该库也是不必要的，因此您可以简单地将其卸载。

pip uninstall -y enum34

如果您需要代码在<= 3.4和> 3.4的python版本上运行，则可以enum-compat根据需要尝试。它仅enum34针对没有标准库枚举的python较旧版本安装。

点击查看英文原文

It’s because your enum is not the standard library enum module. You probably have the package enum34 installed.

One way check if this is the case is to inspect the property enum.__file__

import enum
print(enum.__file__)  
# standard library location should be something like 
# /usr/local/lib/python3.6/enum.py

Since python 3.6 the enum34 library is no longer compatible with the standard library. The library is also unnecessary, so you can simply uninstall it.

pip uninstall -y enum34

If you need the code to run on python versions both <=3.4 and >3.4, you can try having enum-compat as a requirement. It only installs enum34 for older versions of python without the standard library enum.

回答 1

不知道您是否仍然有此问题。我遇到了类似的问题，只需取消设置即可解决PYTHONPATH

$ unset PYTHONPATH

点击查看英文原文

Not sure whether you still have this issue. I had a similar issue and I was able to resolve it simply by unsetting PYTHONPATH

$ unset PYTHONPATH

回答 2

对我来说，此错误是在安装gcloud组件app-engine-python以便集成到pycharm后发生的。即使pycharm现在不上传到app-engine，卸载模块也有帮助。

点击查看英文原文

For me this error occured after installing of gcloud component app-engine-python in order to integrate into pycharm. Uninstalling the module helped, even if pycharm is now not uploading to app-engine.

回答 3

如果有人在PyCharm中运行Google App Engine Python 3.7标准环境项目时由于遇到此错误而来这里，那么您所需要做的就是

  • 确保要运行的配置适用于Flask，而不适用于Google App Engine配置。
  • 然后在偏好设置>>语言和框架>> Google App Engine下禁用Google App Engine支持

原因是根据此链接

总体目标是您的应用程序应具有完全可移植性，并可以在任何标准Python环境中运行。您编写的是标准Python应用程序，而不是App Engine Python应用程序。作为此转变的一部分，您不再需要为应用程序的核心功能使用专有的App Engine API和服务。目前，Python 3.7运行时中不提供App Engine API。

我猜想当我们在PyCharm中将python 3.7项目创建为Google应用引擎项目时，它仍会尝试以与python2.7应用相同的方式进行操作

点击查看英文原文

If anyone coming here because of getting this error while running a google app engine Python 3.7 standard environment project in PyCharm then all you need to do is

  • Make sure the configuration to run is for Flask, not Google App Engine configuration.
  • Then disable Google App Engine support under Preferences >> Languages & Framework >> Google App Engine

The reason being as per this link

The overall goal is that your app should be fully portable and run in any standard Python environment. You write a standard Python app, not an App Engine Python app. As part of this shift, you are no longer required to use proprietary App Engine APIs and services for your app’s core functionality. At this time, App Engine APIs are not available in the Python 3.7 runtime.

I guess when we create a python 3.7 project in PyCharm as a Google app engine project it still tries to do the same way it does for a python2.7 app

回答 4

免责声明：请@ juanpa.arrivillaga，如果您看到此答案，请随时写自己的答案，我将删除此帖子。

@ juanpa.arrivillaga 上面已经提到过：

您的工作目录中是否有文件名enum.py？

这就是我遇到的问题。我当时还不知道python上的enum模块，并已命名我的测试文件enum.py。

由于文件名是模块名，因此存在冲突。有关模块的更多信息，请参见：https : //docs.python.org/2/tutorial/modules.html

点击查看英文原文

DISCLAIMER: Please, @juanpa.arrivillaga, if you see this answer, feel free to write your own and I will remove this post.

@juanpa.arrivillaga had mentioned above:

Is there a file name enum.py in your working directory, by any chance?

This was the issue I encountered. I was not aware of the enum module on python at the time and had named my test file enum.py.

Since the file name is the module name, there was a conflict. More info on modules here: https://docs.python.org/2/tutorial/modules.html

回答 5

在pycharm首选项中禁用“ Google App Engine支持”对我来说解决了这个问题。

点击查看英文原文

Disabling “Google App Engine Support” in pycharm preferences fixed this issue for me.

回答 6

HåkenLid的回答帮助解决了我的问题（谢谢！），在本例中，在运行于Docker容器中的Flask的Python3.7中FROM tiangolo/uwsgi-nginx-flask:python3.7-alpine3.7。

就我而言，enum34是由另一个库（pip install smartsheet-python-sdk）安装的。对于那些遇到类似Docker容器问题的人，这是我的最终Dockerfile（跳至相关行）：

FROM tiangolo/uwsgi-nginx-flask:python3.7-alpine3.7
...
RUN pip install -r requirements.txt
RUN pip uninstall -y enum34
...
点击查看英文原文

Håken Lid’s answer helped solved my problem (thanks!) , in my case present in Python3.7 running Flask in a Docker container (FROM tiangolo/uwsgi-nginx-flask:python3.7-alpine3.7).

In my case, enum34 was being installed by another library (pip install smartsheet-python-sdk). For those coming with a similar Docker container problem, here is my final Dockerfile (stripped to the relevant lines):

FROM tiangolo/uwsgi-nginx-flask:python3.7-alpine3.7
...
RUN pip install -r requirements.txt
RUN pip uninstall -y enum34
...

回答 7

如果必须同时为python2和python3保留PYTHONPATH，则可以编写别名语句以在bash_profile中设置适当的PYTHONPATH：

在〜/ .bash_profile中，对PYTHONPATH2和PYTHONPATH3变量进行硬编码，并在其末尾添加以下别名：

alias python='export PYTHONPATH=${PYTHONPATH2};python'
alias python3='export PYTHONPATH=${PYTHONPATH3};python3'

我python（指python2），因为我更经常使用python2。

点击查看英文原文

In case you have to keep PYTHONPATH for both python2 and python3, you can write alias statements to set the proper PYTHONPATH in your bash_profile:

Hardcode your PYTHONPATH2, and PYTHONPATH3 variables in your ~/.bash_profile, and add the following aliases at the end of it:

alias python='export PYTHONPATH=${PYTHONPATH2};python'
alias python3='export PYTHONPATH=${PYTHONPATH3};python3'

My python (refers to python2) as I use python2 more often.

回答 8

每当我遇到这个问题时：

AttributeError：模块“枚举”没有属性“ IntFlag”

只需首先运行命令： 

unset PYTHONPATH

然后运行我想要的命令，然后在其中成功。

点击查看英文原文

When ever I got this problem:

AttributeError: module ‘enum’ has no attribute ‘IntFlag’

simply first i run the command: 

unset PYTHONPATH

and then run my desired command then got success in that.

回答 9

使用pip install <required-library> --ignore-installed enum34
安装所需的库后，在构建过程中查找警告。我收到这样的错误：
Using legacy setup.py install for future, since package 'wheel' is not installed
ERROR: pyejabberd 0.2.11 has requirement enum34==1.1.2, but you'll have enum34 1.1.10 which is incompatible.

要解决此问题，请运行以下命令：pip freeze | grep enum34。这将为您提供已安装的enum34的版本。现在将其卸载，pip uninstall enum34然后重新安装所需的版本
pip install "enum34==1.1.20"

点击查看英文原文

I did by using pip install <required-library> --ignore-installed enum34
Once your required library is installed, look for warnings during the build. I got an Error like this:
Using legacy setup.py install for future, since package 'wheel' is not installed
ERROR: pyejabberd 0.2.11 has requirement enum34==1.1.2, but you'll have enum34 1.1.10 which is incompatible.

To fix this issue now run the command: pip freeze | grep enum34. This will give you the version of the installed enum34. Now uninstall it by pip uninstall enum34 and reinstall the required version as
pip install "enum34==1.1.20"

回答 10

我的计算机上安装了Python 2和Python 3。由于某些奇怪的原因，当调用re模块时，我在Python 3的sys.path中也有一个指向Python2的sitepackage库目录的路径。如果我运行Python 3并导入枚举，print(enum.__file__)并且系统未显示此Python 2站点包路径。因此，一个非常粗糙和肮脏的技巧是直接修改导入枚举的模块（遵循回溯路径）并在导入枚举之前插入以下代码：

import sys
for i, p in enumerate(sys.path):
    if "python27" in p.lower() or "python2.7" in p.lower(): sys.path.pop(i)
import enum

那解决了我的问题。

点击查看英文原文

I have Python 2 and Python 3 installed on my computer. For some strange reason I have in the sys.path of Python 3 also a path to the sitepackage library directory of Python2 when the re module is called. If I run Python 3 and import enum and print(enum.__file__) the system does not show this Python 2 path to site-packages. So a very rough and dirty hack is, to directly modify the module in which enum is imported (follow the traceback paths) and insert the following code just before importing enum:

import sys
for i, p in enumerate(sys.path):
    if "python27" in p.lower() or "python2.7" in p.lower(): sys.path.pop(i)
import enum

That solved my problem.

回答 11

安装enum34的1.1.8版本对我有用。

我能够通过向pyproject.toml添加enum34 =“ == 1.1.8”来解决此问题。显然enum34在v1.1.8中具有避免此错误的功能，但在v1.1.9 +中已退步。不过，这只是一种解决方法。更好的解决方案是使程序包使用环境标记，因此除非需要，您根本不需要安装enum34。

来源：https：//github.com/python-poetry/poetry/issues/1122

点击查看英文原文

Installing version 1.1.8 of enum34 worked for me.

I was able to fix this by adding enum34 = “==1.1.8” to pyproject.toml. Apparently enum34 had a feature in v1.1.8 that avoided this error, but this regressed in v1.1.9+. This is just a workaround though. The better solution would be for packages to use environment markers so you don’t have to install enum34 at all unless needed.

Source: https://github.com/python-poetry/poetry/issues/1122

回答 12

即使我在运行python -m grpc_tools.protoc –version时遇到了这个问题，也必须设置PYTHONPATH直到站点包并关闭所有命令提示符窗口，然后它才能工作。希望它对gRPC用户有所帮助。

点击查看英文原文

Even I had this issue while running python -m grpc_tools.protoc –version Had to set the PYTHONPATH till site-packages and shutdown all the command prompt windows and it worked. Hope it helps for gRPC users.

回答 13

我在使用python3.8和tensorflow 2.2.0的虚拟环境内核中的jupyterlab的ubuntu20.04中遇到了这个问题。错误消息原为

 Traceback (most recent call last):
  File "/usr/lib/python2.7/runpy.py", line 174, in _run_module_as_main
    "__main__", fname, loader, pkg_name)
  File "/usr/lib/python2.7/runpy.py", line 72, in _run_code
    exec code in run_globals
  File "/home/hu-mka/.local/lib/python2.7/site-packages/ipykernel_launcher.py", line 15, in <module>
    from ipykernel import kernelapp as app
  File "/home/hu-mka/.local/lib/python2.7/site-packages/ipykernel/__init__.py", line 2, in <module>
    from .connect import *
  File "/home/hu-mka/.local/lib/python2.7/site-packages/ipykernel/connect.py", line 13, in <module>
    from IPython.core.profiledir import ProfileDir
  File "/home/hu-mka/.local/lib/python2.7/site-packages/IPython/__init__.py", line 48, in <module>
    from .core.application import Application
  File "/home/hu-mka/.local/lib/python2.7/site-packages/IPython/core/application.py", line 23, in <module>
    from traitlets.config.application import Application, catch_config_error
  File "/home/hu-mka/.local/lib/python2.7/site-packages/traitlets/__init__.py", line 1, in <module>
    from .traitlets import *
  File "/home/hu-mka/.local/lib/python2.7/site-packages/traitlets/traitlets.py", line 49, in <module>
    import enum
ImportError: No module named enum

问题是在/ usr / bin / python中的符号链接中指向python2。解：

cd /usr/bin/
sudo ln -sf python3 python

我希望python2快死了！马库斯Terveisin

点击查看英文原文

I had this problem in ubuntu20.04 in jupyterlab in my virtual env kernel with python3.8 and tensorflow 2.2.0. Error message was

 Traceback (most recent call last):
  File "/usr/lib/python2.7/runpy.py", line 174, in _run_module_as_main
    "__main__", fname, loader, pkg_name)
  File "/usr/lib/python2.7/runpy.py", line 72, in _run_code
    exec code in run_globals
  File "/home/hu-mka/.local/lib/python2.7/site-packages/ipykernel_launcher.py", line 15, in <module>
    from ipykernel import kernelapp as app
  File "/home/hu-mka/.local/lib/python2.7/site-packages/ipykernel/__init__.py", line 2, in <module>
    from .connect import *
  File "/home/hu-mka/.local/lib/python2.7/site-packages/ipykernel/connect.py", line 13, in <module>
    from IPython.core.profiledir import ProfileDir
  File "/home/hu-mka/.local/lib/python2.7/site-packages/IPython/__init__.py", line 48, in <module>
    from .core.application import Application
  File "/home/hu-mka/.local/lib/python2.7/site-packages/IPython/core/application.py", line 23, in <module>
    from traitlets.config.application import Application, catch_config_error
  File "/home/hu-mka/.local/lib/python2.7/site-packages/traitlets/__init__.py", line 1, in <module>
    from .traitlets import *
  File "/home/hu-mka/.local/lib/python2.7/site-packages/traitlets/traitlets.py", line 49, in <module>
    import enum
ImportError: No module named enum

problem was that in symbolic link in /usr/bin/python was pointing to python2. Solution:

cd /usr/bin/
sudo ln -sf python3 python

Hopefully Python 2 usage will drop off completely soon.

回答 14

如果在运行时有这个问题测试中PyCharm，确保第二个框是选中的配置。

点击查看英文原文

If you having this issue when running tests in PyCharm, make sure the second box is unchecked in the configurations.

回答 15

如果有人有试图从virtualenv中运行Jupyter内核的时候这个问题，只需添加正确的PYTHONPATH给kernel.json您的virtualenv内核（Python 3的例子）的：

{
 "argv": [
  "/usr/local/Cellar/python/3.6.5/bin/python3.6",
  "-m",
  "ipykernel_launcher",
  "-f",
  "{connection_file}"
 ],
 "display_name": "Python 3 (TensorFlow)",
 "language": "python",
 "env": {
     "PYTHONPATH":     "/Users/dimitrijer/git/mlai/.venv/lib/python3.6:/Users/dimitrijer/git/mlai/.venv/lib/python3.6/lib-dynload:/usr/local/Cellar/python/3.6.5/Frameworks/Python.framework/Versions/3.6/lib/python3.6:/Users/dimitrijer/git/mlai/.venv/lib/python3.6/site-packages"
}
}
点击查看英文原文

If anyone is having this problem when trying to run Jupyter kernel from a virtualenv, just add correct PYTHONPATH to kernel.json of your virtualenv kernel (Python 3 in example):

{
 "argv": [
  "/usr/local/Cellar/python/3.6.5/bin/python3.6",
  "-m",
  "ipykernel_launcher",
  "-f",
  "{connection_file}"
 ],
 "display_name": "Python 3 (TensorFlow)",
 "language": "python",
 "env": {
     "PYTHONPATH":     "/Users/dimitrijer/git/mlai/.venv/lib/python3.6:/Users/dimitrijer/git/mlai/.venv/lib/python3.6/lib-dynload:/usr/local/Cellar/python/3.6.5/Frameworks/Python.framework/Versions/3.6/lib/python3.6:/Users/dimitrijer/git/mlai/.venv/lib/python3.6/site-packages"
}
}