python 3.x在安装后没有名为sqlalchemy的模块

Question

我试图用ubuntu 12.04为我的python 3.x安装sqlalchemy来与mysql数据库交互，但是当我导入sqlalchemy时，它显示没有名为sqlalchemy的模块。这是我在安装过程中所做的：

aoi@aoi:~$ sudo apt-get install python3-sqlalchemy
[sudo] password for aoi: 
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following packages were automatically installed and are no longer required:
libgio-cil libmono-corlib4.0-cil libmono-system-security4.0-cil libmono-system-xml4.0-  cil libmono-i18n-west4.0-cil cli-common guile-1.8-libs
libmono-system-configuration4.0-cil librhythmbox-core5 mono-runtime libgdu-gtk0  libavahi-ui-gtk3-0 mono-4.0-gac mono-gac
linux-headers-3.5.0-23-generic libglib2.0-cil linux-headers-3.5.0-23 libming1 thunderbird-globalmenu libmusicbrainz3-6 libmono-i18n4.0-cil
libmono-security4.0-cil libmono-system4.0-cil
Use 'apt-get autoremove' to remove them.
 Suggested packages:
 python-sqlalchemy-doc
 The following NEW packages will be installed:
 python3-sqlalchemy
 0 upgraded, 1 newly installed, 0 to remove and 81 not upgraded.
 Need to get 450 kB of archives.
 After this operation, 2,808 kB of additional disk space will be used.
 Get:1 http://ph.archive.ubuntu.com/ubuntu/ precise-updates/main python3-sqlalchemy all   0.7.4-1ubuntu0.1 [450 kB]
 Fetched 450 kB in 40s (11.0 kB/s)                                                                                                                    
 Selecting previously unselected package python3-sqlalchemy.
 (Reading database ... 346102 files and directories currently installed.)
 Unpacking python3-sqlalchemy (from .../python3-sqlalchemy_0.7.4-1ubuntu0.1_all.deb) ...
 Setting up python3-sqlalchemy (0.7.4-1ubuntu0.1) ...

我做错什么了吗？

Answer 1

通过使用apt-get，您已经在Ubuntu的默认Python3的默认目录中安装了sqlalchemy，默认目录为3.2。如果您在目录/usr/lib/python3/dist-packages中搜索，您将找到sqlalchemy模块(或者直接输入locate sqlalchemy)。但是，这不是自定义Python查找其模块的地方。您需要下载源代码并使用正确的Python对其进行编译，类似于sqlalchemy的源代码目录中的/opt/python3.3/bin/python3.3 setup.py install。请参阅此处的说明：http://docs.python.org/3.3/install

Answer 2

这让version0.8.4 for python 2.x ubuntu在保持软件包更新方面非常缓慢。

sudo apt-get install python3-sqlalchemy

因此，对于Python3/ Ubuntu，这里是如何安装sqlalchemy的最新版本

sudo apt-get install python3-pip
# Now you have pip3

sudo apt-get install python3-all-dev
# Required for sqlalchemy's c extensions to be installed

sudo pip3 install SQLAlchemy
# note using pip, not pip3, will install for Python 2.7

:~$ python3
>>> import sqlalchemy
>>> sqlalchemy.__version__
>>> '0.9.8'
>>> print("Who's the man?")
>>> You are baby!
>>> quit()

Answer 3

似乎python3-sqlalchemy已经过时了。您可以尝试使用pip3获取最新版本。

sudo pip3 install sqlalchemy

应该能行得通。