code: def install_prefix(self):
      if self._install_prefix:
          return self._install_prefix
  
      if self.use_conda:
          return os.environ.get("CONDA_PREFIX")
  
      return None
  
file_path: arrow/dev/archery/archery/lang/cpp.py
imports: import os
  from ..utils.cmake import CMakeDefinition
label_desc: Use image node_id 6 for calling the CppConfiguration obj's underlying member method code with example usage: obj.install_prefix() and returns: None, self, os