title: ufunc 'add' did not contain a loop with signature matching types dtype('<U23') dtype('<U23') dtype('<U23')
body: <p>When trying to convert the sklearn dataset into pandas dataframe by the following code I am getting this error "ufunc 'add' did not contain a loop with signature matching types dtype('
  
  <pre><code>import numpy as np
  from sklearn.datasets import load_breast_cancer
  import numpy as np
  cancer = load_breast_cancer()
  data = pd.DataFrame(data= np.c_[cancer['data'], cancer['target']],columns=   cancer['feature_names'] + cancer['target'])
  </code></pre>