class_docstr: Represents an environment variable.
code: def __str__(self):
      return f"{self.name} (default: {self.default}, type: {self.type.__name__})"
  
file_path: mlflow/mlflow/environment_variables.py
imports: import os
  from pathlib import Path
label_desc: Use image node_id 7 for calling the _EnvironmentVariable obj's underlying member method code with example usage: obj.__str__() and returns: self, str, self, str, self, str