old_contents: from datetime import datetime, date
  
  from sqlalchemy import Integer, UnicodeText, Float, BigInteger
  from sqlalchemy import Boolean, Date, DateTime, Unicode
  from sqlalchemy.types import TypeEngine
  
  
  class Types(object):
      """A holder class for easy access to SQLAlchemy type names."""
      integer = Integer
      string = Unicode
      text = UnicodeText
      float = Float
      bigint = BigInteger
      boolean = Boolean
      date = Date
      datetime = DateTime
  
      def guess(cls, sample):
          """Given a single sample, guess the column type for the field.
  
          If the sample is an instance of an SQLAlchemy type, the type will be
          used instead.
          """
          if isinstance(sample, TypeEngine):
              return sample
          if isinstance(sample, bool):
              return cls.boolean
          elif isinstance(sample, int):
              return cls.bigint
          elif isinstance(sample, float):
              return cls.float
          elif isinstance(sample, datetime):
              return cls.datetime
          elif isinstance(sample, date):
              return cls.date
          return cls.text
  
new_contents: from datetime import datetime, date
  
  from sqlalchemy import Integer, UnicodeText, Float, BigInteger
  from sqlalchemy import Boolean, Date, DateTime, Unicode
  from sqlalchemy.types import TypeEngine
  
  
  class Types(object):
      """A holder class for easy access to SQLAlchemy type names."""
      integer = Integer
      string = Unicode
      text = UnicodeText
      float = Float
      bigint = BigInteger
      boolean = Boolean
      date = Date
      datetime = DateTime
  
      def guess(self, sample):
          """Given a single sample, guess the column type for the field.
  
          If the sample is an instance of an SQLAlchemy type, the type will be
          used instead.
          """
          if isinstance(sample, TypeEngine):
              return sample
          if isinstance(sample, bool):
              return self.boolean
          elif isinstance(sample, int):
              return self.bigint
          elif isinstance(sample, float):
              return self.float
          elif isinstance(sample, datetime):
              return self.datetime
          elif isinstance(sample, date):
              return self.date
          return self.text
  
subject: Replace `cls` argument with `self` Not sure if this was originally intended to be a `@classmethod` but it's now written and called as a method bound to an instance of the class.