code: def install_python_package(self, arch, name=None, env=None, is_dir=True):
          '''Automate the installation of a Python package (or a cython
          package where the cython components are pre-built).'''
          if env is None:
              env = self.get_recipe_env(arch)
  
          with current_directory(self.get_build_dir(arch.arch)):
              hostpython = sh.Command(self.ctx.hostpython)
  
              shprint(hostpython, 'setup.py', 'build_ext', '--static-libpq',
                      _env=env)
              shprint(hostpython, 'setup.py', 'install', '-O2',
                      '--root={}'.format(self.ctx.get_python_install_dir()),
                      '--install-lib=.', _env=envf install_python_package(self, arch, name=None, env=None, is_dir=True):
          '''Automate the installation of a Python package (or a cython
          package where the cython components are pre-built).'''
          if env is None:
              env = self.get_recipe_env(arch)
  
          with current_directory(self.get_build_dir(arch.arch)):
              hostpython = sh.Command(self.ctx.hostpython)
  
              shprint(hostpython, 'setup.py', 'build_ext', '--static-libpq',
                      _env=env)
              shprint(hostpython, 'setup.py', 'install', '-O2',
                      '--root={}'.format(self.ctx.get_python_install_dir()),
                      '--install-lib=.', _env=env)
docs: Automate the installation of a Python package (or a cython
          package where the cython components are pre-built).