Collecting MySQL-python
  Using cached MySQL-python-1.2.5.zip
    Complete output from command python setup.py egg_info:
    Traceback (most recent call last):
      File "<string>", line 1, in <module>
      File "/private/var/folders/d2/gd004m2s35z5dlyz9mfn6sc40000gn/T/pip-build-FYvb_T/MySQL-python/setup.py", line 17, in <module>
        metadata, options = get_config()
      File "setup_posix.py", line 53, in get_config
        libraries = [ dequote(i[2:]) for i in libs if i.startswith(compiler_flag("l")) ]
      File "setup_posix.py", line 8, in dequote
        if s[0] in "\"'" and s[0] == s[-1]:
    IndexError: string index out of range

By finding out the information that mysql-connector-cmight come to the conclusion that the configuration by brew installation may be incorrect , open the /usr/local/bin/mysql_config script to modify some of the contents of it:

#Create options
Libs = "-L $ pkglibdir "
Libs = " $ libs   -l"

change into:

#Create options
Libs = "- L $ pkglibdir"
Libs = "$ libs -lmysqlclient -lssl -lcrypto"

Save
Then re-install mysql-python:

pip install mysql-python