code: def mksalt(method=None, *, rounds=None):
      """Generate a salt for the specified method.
  
      If not specified, the strongest available method will be used.
  
      """
      if method is None:
          method = methods[0]
      if rounds is not None and not isinstance(rounds, int):
          raise TypeError(
              f"{rounds.__class__.__name__} object cannot be "
              f"interpreted as an integer"
          )
      if not method.ident:  # traditional
          s = ""
      else:  # modular
          s = f"${method.ident}$"
  
      if method.ident and method.ident[0] == "2":  # Blowfish variants
          if rounds is None:
              log_rounds = 12
          else:
              log_rounds = int.bit_length(rounds - 1)
              if rounds != 1 << log_rounds:
                  raise ValueError("rounds must be a power of 2")
              if not 4 <= log_rounds <= 31:
                  raise ValueError(
                      "rounds out of the range 2**4 to 2**31"
                  )
          s += f"{log_rounds:02d}$"
      elif method.ident in ("5", "6"):  # SHA-2
          if rounds is not None:
              if not 1000 <= rounds <= 999_999_999:
                  raise ValueError(
                      "rounds out of the range 1000 to 999_999_999"
                  )
              s += f"rounds={rounds}$"
      elif rounds is not None:
          raise ValueError(
              f"{method} doesn't support the rounds argument"
          )
  
      s += "".join(
          _sr.choice(_saltchars) for char in range(method.salt_chars)
      )
      return s
  
file_path: catboost/contrib/tools/python3/src/Lib/crypt.py
imports: import sys
  import errno
  import string
  import warnings
  from random import SystemRandom
  from collections import namedtuple
label_desc: Use image node_id 1 for calling a global function with example usage: mksalt(method) and returns: s