python 3.x no module named sqlalchemy after installation

I’m trying to install sqlalchemy to interact with mysql database for my python 3.x with ubuntu 12.04, but then when I import the sqlalchemy it says no module named sqlalchemy. This is what i did with installation:

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) ...

Did I do something wrong?

Answer

By using apt-get you have installed sqlalchemy in the default directory for Ubuntu’s default Python 3, which is 3.2. If you search in the directory /usr/lib/python3/dist-packages you’ll find the sqlalchemy module (or just type locate sqlalchemy). However, this isn’t where a custom Python will look for its modules. You’ll need to download the source and compile it with the correct Python, something like /opt/python3.3/bin/python3.3 setup.py install in the source directory for sqlalchemy. See the instructions here: http://docs.python.org/3.3/install