title: Remove first character from pandas column if the number 1
body: <p>The below code removes any dashes in any of the phone number columns.  How do I also remove the first character of a phone number in those columns if the phone number begins with 1.  I basically want to have all ten digit numbers with no leading 1s.</p>
  
  <pre><code>import pandas as pd
  import numpy as np
  import re
  
  df = pd.read_csv('test2.csv')
  
  cols_to_check = ['Phone', 'phone', 'Phone.1']
  
  df[cols_to_check] = df[cols_to_check].replace({'-':''}, regex=True)
  
  df.to_csv('testnew.csv', mode = 'w', index=False)
  </code></pre>