ImportError:没有名为“cloudant.client”的模块；“cloudant”不是包

Question

我使用的是Python3.5，我已经通过执行命令安装了cloudant包：

sudo -H pip3 install cloudant

我试着连接python数据库。根据文档- https://console.bluemix.net/docs/services/Cloudant/getting-started.html#getting-started-with-cloudant。这段代码应该可以工作：

from cloudant.client import Cloudant

client = Cloudant("username", "password", url="https://user_name.cloudant.com")
client.connect()
client.disconnect()

当我运行它时，我得到一个错误：

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/tomek/Projects/stage-control/cloudant.py", line 1, in <module>
    from cloudant.client import Cloudant
ImportError: No module named 'cloudant.client'; 'cloudant' is not a package

Answer 1

我怀疑您的问题可能是用于安装模块的pip不是您的python正在使用的pip：

如果我使用pip3 install cloudant，我会遇到和你一样的问题：

(py35) stefans-mbp:work stefan$ python
Python 3.5.3 |Anaconda 4.4.0 (x86_64)| (default, Mar  6 2017, 12:15:08) 
[GCC 4.2.1 Compatible Apple LLVM 6.0 (clang-600.0.57)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> from cloudant.client import Cloudant
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
ImportError: No module named 'cloudant.client'

这是因为：

(py35) stefans-mbp:work stefan$ which pip
//anaconda/envs/py35/bin/pip
(py35) stefans-mbp:work stefan$ which pip3
/usr/local/bin/pip3

安装cloudant模块时使用了错误的pip3。要进行补救，请确保在正在使用的虚拟环境中使用pip：

(py35) stefans-mbp:work stefan$ pip install cloudant
Collecting cloudant
Using cached cloudant-2.7.0.tar.gz
Requirement already satisfied: requests<3.0.0,>=2.7.0 in 
/anaconda/envs/py35/lib/python3.5/site-packages (from cloudant)
Building wheels for collected packages: cloudant
  Running setup.py bdist_wheel for cloudant ... done
  Stored in directory: ...
Successfully built cloudant
Installing collected packages: cloudant
Successfully installed cloudant-2.7.0

现在它可以工作了：

(py35) stefans-mbp:work stefan$ python
Python 3.5.3 |Anaconda 4.4.0 (x86_64)| (default, Mar  6 2017, 12:15:08) 
Type "help", "copyright", "credits" or "license" for more information.
>>> from cloudant.client import Cloudant
>>> 

Answer 2

只需将文件cloudant.py重命名为其他名称即可。

Answer 3

您是在本地运行还是在Bluemix上的应用程序中运行？一定是你的安装出了什么问题，因为代码看起来没问题。下面的代码为我运行：

from cloudant.client import Cloudant
from cloudant.document import Document

client = Cloudant("username", "pw", url="https://username.cloudant.com")
client.connect()
thedb = client["databasename"]
for document in thedb:
    print(document)
client.disconnect()

如果您在Bluemix上运行，请确保您有一个requirements.txt文件来触发库导入。请参阅https://pip.readthedocs.io/en/1.1/requirements.html