title: Converting numpy array into dataframe column?
body: <p>How do I convert a numpy array into a dataframe column. Let's say I have created an empty dataframe, <code>df</code>, and I loop through code to create 5 numpy arrays. Each iteration of my for loop, I want to convert the numpy array I have created in that iteration into a column in my dataframe. Just to clarify, I do not want to create a new dataframe every iteration of my loop, I only want to add a column to the existing one. The code I have below is sketchy and not syntactically correct, but illustrates my point.</p>
  
  <pre><code>df = pd.dataframe()
  for i in range(5):
     arr = create_numpy_arr(blah) # creates a numpy array
     df[i] = # convert arr to df column
  </code></pre>