code: def strfunc(z):
      if z == 0:
          return ""
      elif z == 1:
          return "_d"
      else:
          return "_" + "d" * z
  
file_path: sympy/sympy/parsing/autolev/_listener_autolev_antlr.py
imports: import collections
  import warnings
  from sympy.external import import_module
label_desc: Use image node_id 1 for calling a global function with example usage: strfunc(z) and returns: str, str, unknown