text: """To String."""
  
  from foreshadow.base import BaseEstimator, TransformerMixin
  from foreshadow.wrapper import pandas_wrap
  
  
  @pandas_wrap
  class ToString(BaseEstimator, TransformerMixin):
      """Convert passed in data to string format."""
  
      def fit(self, X, y=None):
          """Empty fit.
  
          Args:
              X: input observations
              y: input labels
  
          Returns:
              self
  
          """
          return self
  
      def transform(self, X, y=None):
          """Convert a column to string form.
  
          Args:
              X (:obj:`pandas.DataFrame`): X data
              y: input labels
  
          Returns:
              :obj:`pandas.DataFrame`: Transformed data
  
          """
          return X.astype("str")
  