class_docstr: Writes a single pyi file
class_docstr_tok: ["Writes","a","single","pyi","file"]
code: def write(self) -> str:
      imports = []
      for pkg, items in self.imports.items():
          if pkg.startswith("google."):
              imports.append(f"from {pkg} import (  # type: ignore")
          else:
              imports.append(f"from {pkg} import (")
          for item in sorted(items):
              imports.append(f"    {item},")
          imports.append(")\n")
  
      return "\n".join(imports + self.lines)
  
file_path: onnx/tools/protoc-gen-mypy.py
imports: import sys
  from collections import defaultdict
  from contextlib import contextmanager
  from typing import Any, Callable, Dict, Generator, List, Optional, Set, cast
label_desc: Use image node_id 10 for calling the PkgWriter obj's underlying member method code with example usage: obj.write() and returns: str