old_contents: #!/usr/bin/env python
  #
  # A class for auto identifying bioinformatics file formats.
  # By Lee & Matt
  
  import re
  import json
  import mmap
  
  
  class BioID:
      defs = None
  
      def __init__(self, defpath):
          with open(defpath, "r") as deffile:
              conts = deffile.read()
          self.defs = json.loads(conts)["formats"]
  
      @classmethod
      def identify(cls, files):
          recog = {}
          for file in files:
              with open(file, "r") as infile:
                  buff = infile.read()
                  mem_map = mmap.mmap(infile.fileno(), 0, mmap.MAP_PRIVATE, mmap.PROT_READ)
  
              if len(buff) == 0:
                  recog[file] = "empty"  # Empty files have no format :)
                  continue
  
              for fdef in cls.defs:
                  matched = True
                  if "regexen" in fdef:
                      for regex in fdef["regexen"]:
  						if not re.findall(regex.replace("\\n", "\n"), buff, re.IGNORECASE):
                              matched = False
                              break
                  if "bytes" in fdef:
                      for bytes in fdef["bytes"]:
                          if mem_map.find(bytes.decode("string_escape")) == -1:
                              matched = False
                              break
                  if matched:
                      recog[file] = fdef["name"]
                      break
  
              mem_map.close()
              if file not in recog:
                  recog[file] = "unrecognized"
  
          return recog
new_contents: #!/usr/bin/env python
  #
  # A class for auto identifying bioinformatics file formats.
  # By Lee & Matt
  
  import re
  import json
  import mmap
  
  
  class BioID:
  	defs = None
  
  	def __init__(self, defpath):
  		with open(defpath, "r") as deffile:
  			conts = deffile.read()
  		self.defs = json.loads(conts)["formats"]
  
  	@classmethod
  	def identify(cls, files):
  		recog = {}
  		for file in files:
  			with open(file, "r") as infile:
  				buff = infile.read()
  				mem_map = mmap.mmap(infile.fileno(), 0, mmap.MAP_PRIVATE, mmap.PROT_READ)
  
  			if len(buff) == 0:
  				recog[file] = "empty"  # Empty files have no format :)
  				continue
  
  			for fdef in cls.defs:
  				matched = True
  				if "regexen" in fdef:
  					for regex in fdef["regexen"]:
  						if not re.findall(regex.replace("\\n", "\n"), buff, re.IGNORECASE):
  							matched = False
  							break
  			if "bytes" in fdef:
  				for bytes in fdef["bytes"]:
  					if mem_map.find(bytes.decode("string_escape")) == -1:
  						matched = False
  						break
  			if matched:
  				recog[file] = fdef["name"]
  				break
  
  		mem_map.close()
  		if file not in recog:
  			recog[file] = "unrecognized"
  
  		return recog
subject: Indent return in identify class.