added tqdm support

Author: ragrawal

setup.py

@@ -41,7 +41,8 @@ def run(self):
           'scikit-learn>=0.15.0',
           'scipy>=0.14',
           'pandas>=0.11.0',
-          'numpy>=1.6.1'],
+          'numpy>=1.6.1',
+          'tqdm>=4.46.0'],
       tests_require=['pytest', 'mock'],
       cmdclass={'test': PyTest},
       )

sklearn_pandas/dataframe_mapper.py

@@ -1,6 +1,7 @@
 import sys
 import contextlib
 
+from tqdm import tqdm
 import pandas as pd
 import numpy as np
 from scipy import sparse
@@ -210,7 +211,7 @@ def fit(self, X, y=None):
         """
         self._build()
 
-        for columns, transformers, options in self.built_features:
+        for columns, transformers, options in tqdm(self.built_features):
             input_df = options.get('input_df', self.input_df)
 
             if transformers is not None:
@@ -289,7 +290,7 @@ def _transform(self, X, y=None, do_fit=False):
 
         extracted = []
         self.transformed_names_ = []
-        for columns, transformers, options in self.built_features:
+        for columns, transformers, options in tqdm(self.built_features):
             input_df = options.get('input_df', self.input_df)
 
             # columns could be a string or list of