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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def find_path(self, basename, install_dir=None):
 """ Look in a few places for a file with the given name. If a custom version of the file is found in the directory being managed by this workspace, return it. Otherwise look in the custom and default input directories in the root directory, and then finally in the root directory itself. This function makes it easy to provide custom parameters to any stage to the design pipeline. Just place the file with the custom parameters in a directory associated with that stage. """


        # Look for the file we were asked for.
        for dir in self.find_path_dirs:
            path = os.path.join(dir, basename)
            if os.path.exists(path):
                return path

        # If we didn't find the file, return the path to where we'd like it to 
        # be installed.
        return os.path.join(install_dir or self.preferred_install_dir, basename)