✨ add pretty print function

"""

Feature calculations.

"""

import inspect

import logging

import numpy as np

import multiprocessing

    """

    raise NotImplementedError('Featurizer is not defined.')

  def __str__(self) -> str:

    """Convert class to string.

    Returns

    -------

    str

      The string represents the class.

    Examples

    --------

    >>> import deepchem as dc

    >>> str(dc.feat.CircularFingerprint(size=1024, radius=4))

    'CircularFingerprint_radius_4_size_1024'

    """

    args_spec = inspect.getfullargspec(self.__init__)  # type: ignore

    args_names = [arg for arg in args_spec.args if arg != 'self']

    args_default_values = list(args_spec.defaults) \

      if args_spec.defaults is not None else []

    # the case some arguments don't have the default value

    args_num = len(args_names)

    args_default_num = len(args_default_values)

    if args_num > args_default_num:

      diff = args_num - args_default_num

      args_default_values = [None] * diff + args_default_values

    assert len(args_names) == len(args_default_values)

    override_args_info = ''

    for arg_name, default in zip(args_names, args_default_values):

      arg_value = self.__dict__[arg_name]

      if default != arg_value:

        override_args_info += '_' + arg_name + '_' + str(arg_value)

    return self.__class__.__name__ + override_args_info

class ComplexFeaturizer(object):

  """"