title: AttributeError: 'Worksheet' object has no attribute 'set_column'
body: <p>I am getting an error that seems... wrong. Because of course worksheet object has set_column() as a function, it's in the docs. I've probably done something dumb like drop a parenthesis.</p>
  <p>Here's the error:</p>
  <pre><code>Traceback (most recent call last):
    File &quot;scrubaddresses.py&quot;, line 137, in &lt;module&gt;
      run()
    File &quot;scrubaddresses.py&quot;, line 118, in run
      format_col_width(worksheet)
    File &quot;scrubaddresses.py&quot;, line 24, in auto_format_cell_width
      ws.set_column('B:C', 20)
  AttributeError: 'Worksheet' object has no attribute 'set_column'
  </code></pre>
  <p>Here's my ridiculous import. Config is some constants, controller has some helper functions.</p>
  <pre><code>from smartystreets_python_sdk import StaticCredentials, exceptions, Batch, ClientBuilder
  from smartystreets_python_sdk.us_street import Lookup as StreetLookup
  from pathlib import Path
  import pandas as pd
  import numpy as np
  import config
  from controller import getExcel, clean
  </code></pre>
  <p>The func in question:</p>
  <pre><code>def format_col_width(ws):
      ws.set_column('B:C', 20)
      ws.set_column('D', 1)
      ws.set_column('E', 20)
  </code></pre>
  <p>Where the ws being passed comes from:</p>
  <pre><code>            df1 = df.replace(np.nan, '', regex=True)
              print(df1)
  
              df1.to_excel(writer, sheet, index = False, engine='xlsxwriter')
              worksheet = writer.sheets[sheet]
              format_col_width(worksheet)
  </code></pre>
  <p>Did I forget to import something? Xlsxwriter is installed.</p>