class_docstr: A context for prepending a directory to sys.path for a second.
code: def __enter__(self):
      if self._main_script_path not in sys.path:
          sys.path.insert(0, self._main_script_path)
          self._added_path = True
  
imports: import sys
  from streamlit import util
label_desc: Use image node_id 3 for calling the modified_sys_path obj's underlying member method code with example usage: obj.__enter__() without return types