code: def read_floatnl(f):
      r"""
      >>> import io
      >>> read_floatnl(io.BytesIO(b"-1.25\n6"))
      -1.25
      """
      s = read_stringnl(f, decode=False, stripquotes=False)
      return float(s)
  
imports: import codecs
  import io
  import pickle
  import re
  import sys
  from struct import unpack
  from pickle import decode_long
label_desc: Use image node_id 21 for calling a global function with example usage: read_floatnl(f) and returns: float