AttributeError:模块'pystan‘没有属性'StanModel’

Question

运行下面的代码行(包已经存在)之后：

pip install -vvv pystan

Requirement already satisfied: pystan in /Users/cmougan/anaconda3/lib/python3.6/site-packages (2.17.1.0)
Requirement already satisfied: Cython!=0.25.1,>=0.22 in /Users/cmougan/anaconda3/lib/python3.6/site-packages (from pystan) (0.28.2)
Requirement already satisfied: numpy>=1.7 in /Users/cmougan/anaconda3/lib/python3.6/site-packages (from pystan) (1.16.2)
Carloss-MacBook-Pro:Desktop cmougan$ pip install -vvv pystan
Non-user install because site-packages writeable
Created temporary directory: /private/var/folders/j6/tcx3t7vj4fs8rsb97cwg06nc0000gn/T/pip-ephem-wheel-cache-0p2f3viv
Created temporary directory: /private/var/folders/j6/tcx3t7vj4fs8rsb97cwg06nc0000gn/T/pip-req-tracker-lg301zxr
Initialized build tracking at /private/var/folders/j6/tcx3t7vj4fs8rsb97cwg06nc0000gn/T/pip-req-tracker-lg301zxr
Created build tracker: /private/var/folders/j6/tcx3t7vj4fs8rsb97cwg06nc0000gn/T/pip-req-tracker-lg301zxr
Entered build tracker: /private/var/folders/j6/tcx3t7vj4fs8rsb97cwg06nc0000gn/T/pip-req-tracker-lg301zxr
Created temporary directory: /private/var/folders/j6/tcx3t7vj4fs8rsb97cwg06nc0000gn/T/pip-install-8ffjd5t4
Requirement already satisfied: pystan in /Users/cmougan/anaconda3/lib/python3.6/site-packages (2.17.1.0)
Requirement already satisfied: Cython!=0.25.1,>=0.22 in /Users/cmougan/anaconda3/lib/python3.6/site-packages (from pystan) (0.28.2)
Requirement already satisfied: numpy>=1.7 in /Users/cmougan/anaconda3/lib/python3.6/site-packages (from pystan) (1.16.2)
Removed build tracker: '/private/var/folders/j6/tcx3t7vj4fs8rsb97cwg06nc0000gn/T/pip-req-tracker-lg301zxr'

我执行以下操作：

import pystan
model_code = 'parameters {real y;} model {y ~ normal(0,1);}'
model = pystan.StanModel(model_code=model_code)  # this will take a minute
y = model.sampling(n_jobs=1).extract()['y']
y.mean()  # should be close to 0

我得到了以下错误：

---------------------------------------------------------------------------
AttributeError                            Traceback (most recent call last)
<ipython-input-40-d7f147a8ee3e> in <module>
      1 import pystan
      2 model_code = 'parameters {real y;} model {y ~ normal(0,1);}'
----> 3 model = pystan.StanModel(model_code=model_code)  # this will take a minute
      4 y = model.sampling(n_jobs=1).extract()['y']
      5 y.mean()  # should be close to 0

AttributeError: module 'pystan' has no attribute 'StanModel'

我使用的是python 3.6和pip。我使用标志-vvv来获取更多详细信息，以帮助调试错误。

Answer 1

您有一个pystan.py文件。import pystan从文件导入，而不是从已安装的pystan软件包导入。

删除或重命名该文件。并且永远不要创建遮蔽现有模块的文件.py，如email.py、test.py等。