Python mysqldb Library not loaded libmysqlclient 18 dylib

Question

I just compiled and installed mysqldb for python 2 7 on my mac os 10 6  I created a simple test file that imports   import MySQLdb as mysql   Firstly  this command is red underlined and the info tells me  Unresolved import   Then I tried to run the following simple python code  import MySQLdb as mysql  def main        conn   mysql connect  charset  utf8   use unicode True  host  localhost  user  root   passwd    db       if   name         main           main     When executing it I get the following error message  Traceback  most recent call last     File   path to project Python src cvdv TestMySQLdb py   line 4  in  lt module gt      import MySQLdb as mysql   File  build bdist macosx-10 6-intel egg MySQLdb   init   py   line 19  in  lt module gt       namespace cvdv   File  build bdist macosx-10 6-intel egg  mysql py   line 7  in  lt module gt    File  build bdist macosx-10 6-intel egg  mysql py   line 6  in   bootstrap   ImportError  dlopen  Users toom  python-eggs MySQL python-1 2 3-py2 7-macosx-10 6-intel egg-tmp  mysql so  2   Library not loaded  libmysqlclient 18 dylib   Referenced from   Users toom  python-eggs MySQL python-1 2 3-py2 7-macosx-10 6-intel egg-tmp  mysql so   Reason  image not found   What might be the solution to my problem   EDIT  Actually I found out that the library lies in  usr local mysql lib  So I need to tell my pydev eclipse version where to find it  Where do I set this

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I ve run into this with a couple virtual environments   pip uninstall MySQL-python pip install -U MySQL-python   Worked both times

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On new El Capitan installation where SIP rootless prevents access to usr lib   is on by default and you cannot create the symlink unless you are in recovery mode  As  yannisxu said you can disable SIP and do your symlink to  usr lib local and this will work    you can use the following command on MAC OSX El Capitan instead of turning off SIP   sudo ln -s  usr local mysql lib libmysqlclient 18 dylib  usr local lib libmysqlclient 18 dylib   There used to be an option where you can login as root and this can disable SIP but in the final release that is now obsolete  you can read more about it here  https   forums developer apple com thread 4686  Question   There is a nvram boot-args command available in Developer Beta 1 which can disable SIP when run with root privileges   nvram boot-args  rootless 0    Will this option of disabling SIP also be available in the El Capitan release version  Or is this strictly for the Developer Builds   Answer   This nvram boot-args command will be going away  It will not be available in the El Capitan release version and may disappear before the end of the Developer Betas  Keep an eye on the release notes for future Developer Betas

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I found there was another solution for this problem rather than creating a symbolic link   You set the path to your directory  where libmysqlclient 18 dylib resides  to DYLD LIBRARY PATH environment variable  What I did is to put following line in my  bash profile   export DYLD LIBRARY PATH  usr local mysql-5 5 15-osx10 6-x86 lib   DYLD LIBRARY PATH   That s it

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In my case  I was getting the error with Mac OS X 10 9 Mavericks  I installed MySQL Community Server directly from the Oracle MySQL Website from DMG   All I needed to do was symlink the lib files to the  usr local lib directory    mkdir -p  usr local lib    ln -s  usr local mysql lib libmysql   usr local lib   Bonus  If you re running Mac OS X as well  there is a great tool to finding files like the libmysqlclient 18 dylib file  http   apps tempel org FindAnyFile  This is how I originally found the location of the dylib file

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when you are in El Capitan  will get error  ln   usr lib libmysqlclient 18 dylib  Operation not permitted need to close the  System Integrity Protection    first  reboot and hold on cmd   R to enter the Recovery mode  then launch the terminal and type the command  csrutil disable  now you can reboot and try again

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you can try   sudo install name tool -change libmysqlclient 18 dylib  Users toom  python-eggs MySQL python-1 2 3-py2 7-macosx-10 6-intel egg-tmp  mysql so

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I had this issue and it took me for a while to figure out how to fix that   My case is slightly different  My MySQL server is of version 5 1 x  And somehow I upgraded my MySQL-python from 1 2 3 to 1 2 5  And I kept getting this issue since then event I added the following soft link   libmysqlclient 18 dylib - gt   usr local mysql lib libmysqlclient 18 dylib   It turns out that for MySQL 5 1 x there is no libmysqlclient 18 dylib  but only libmysqlclient 16 dylib  You can fix this issue either by downgrade your MySQL-python to 1 2 3 or upgrade your MySQL server to 5 6 x  I haven t tried 5 5 x    I downgraded the library to 1 2 3 since upgrading MySQL is not an option for me

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My preferred method is to actually fix the library rather than playing with environment variables that may or may not actually be in scope depending on how the application is run   This is actually a fairly simple process   First  look at the error output to see where the offending python module is located      ImportError  dlopen  Library Python 2 7 site-packages  mysql so  2   Library not loaded  libmysqlclient 18 dylib    Referenced from   Library Python 2 7 site-packages  mysql so    Reason  image not found   Okay  so the offending file is  Library Python 2 7 site-packages  mysql so  Next  figure out where  mysql so thinks it should find libmysqlclient 18 dylib     otool -L  Library Python 2 7 site-packages  mysql so  Library Python 2 7 site-packages  mysql so      libmysqlclient 18 dylib  compatibility version 18 0 0  current version 18 0 0       usr lib libSystem B dylib  compatibility version 1 0 0  current version 169 3 0    So  it s looking for libmysqlclient 18 dylib with no path information  let s fix that     sudo install name tool -change libmysqlclient 18 dylib  usr local mysql lib libmysqlclient 18 dylib  Library Python 2 7 site-packages  mysql so   Now  mysql so knows the full path to the library and everything works  regardless of environment variables     otool -L  Library Python 2 7 site-packages  mysql so                                                                                             Library Python 2 7 site-packages  mysql so       usr local mysql lib libmysqlclient 18 dylib  compatibility version 18 0 0  current version 18 0 0       usr lib libSystem B dylib  compatibility version 1 0 0  current version 169 3 0

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I solved the problem by creating a symbolic link to the library  I e   The actual library resides in   usr local mysql lib   And then I created a symbolic link in    usr lib   Using the command   sudo ln -s  usr local mysql lib libmysqlclient 18 dylib  usr lib libmysqlclient 18 dylib   so that I have the following mapping   ls -l libmysqlclient 18 dylib  lrwxr-xr-x  1 root  wheel  44 16 Jul 14 01 libmysqlclient 18 dylib - gt   usr local mysql lib libmysqlclient 18 dylib   That was it  After that everything worked fine   EDIT   Notice  that since MacOS El Capitan the System Integrity Protection  SIP  also known as  rootless   will prevent you from creating links in  usr lib    You could disable SIP by following these instructions  but you can create a link in  usr local lib  instead   sudo ln -s  usr local mysql lib libmysqlclient 18 dylib  usr local lib libmysqlclient 18 dylib

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For those using homebrew you might fix this with     brew link mysql

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go to http   dev mysql com downloads connector c  and download MySQL Connector C  after getting the package  make a new directory  mysql   uncompress the Mysql Connector file  under directory mysql  then under mysql  make another empty directory  build  we will use  build  to build MySQL Connector C  cd build  amp  amp  cmake    your-MySQL-Connector-source-dir  make  amp  amp  make install after make install  you will get a directory named mysql under  usr local  it contains all the headers and libs you need go to this dirctory  and copy the headers and libs to corresponding locations

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I found putting this in your  profile or  bashrc  whichever you use  is the easiest way to do it  sym links are messy compared to keeping paths in your source files     Also compared to yoshisurfs answer  most of the time when mysql gets installed the mysql directory should be renamed to just mysql  not the whole file name  for ease of use   export DYLD LIBRARY PATH  usr local mysql lib  DYLD LIBRARY PATH

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In my Case  in El Capitan  OSX 10 11   I have to do following in    bash profile  export DYLD LIBRARY PATH   usr local mysql lib   DYLD LIBRARY PATH   export PATH   usr local mysql lib   PATH

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Note about bug of MySQL Connector C on macOS  my current version is 10 13 2   fix the mysql config and reinstall mysqlclient or MySQL-python  here is the detail

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In pydev eclipse plugin  you may want to set the environment variable for DYLD  The path can be set as shown in  Install mysqldb on snow leopard

[python] Python mysqldb: Library not loaded: libmysqlclient.18.dylib

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