code: def main():
      import getopt
  
      global verbose, recurse, dryrun, makebackup, spec_newline
      try:
          opts, args = getopt.getopt(
              sys.argv[1:],
              "drnvh",
              [
                  "dryrun",
                  "recurse",
                  "nobackup",
                  "verbose",
                  "newline=",
                  "help",
              ],
          )
      except getopt.error as msg:
          usage(msg)
          return
      for o, a in opts:
          if o in ("-d", "--dryrun"):
              dryrun = True
          elif o in ("-r", "--recurse"):
              recurse = True
          elif o in ("-n", "--nobackup"):
              makebackup = False
          elif o in ("-v", "--verbose"):
              verbose = True
          elif o in ("--newline",):
              if not a.upper() in ("CRLF", "LF"):
                  usage()
                  return
              spec_newline = dict(CRLF="\r\n", LF="\n")[a.upper()]
          elif o in ("-h", "--help"):
              usage()
              return
      if not args:
          r = Reindenter(sys.stdin)
          r.run()
          r.write(sys.stdout)
          return
      for arg in args:
          check(arg)
  
file_path: cpython/Tools/patchcheck/reindent.py
imports: import tokenize
  import os
  import shutil
  import sys
label_desc: Use image node_id 3 for calling a global function with example usage: main() without return types