title: Remove special characters from column headers
body: <p>I have a dictionary (data_final) of dataframes (health, education, economy,...). The dataframes contain data from one xlsx file. In one of the dataframes (economy), the column names have brackets and single quotes added to it.</p>
  
  <pre><code>data_final['economy'].columns = 
  Index([                                ('Sr.No.',),
                                   ('DistrictName',),
                                    ('Agriculture',),
                              ('Forestry&amp; Logging',),
                                        ('Fishing',),
                              ('Mining &amp;Quarrying',),
                              ('ManufacturingMFG.',),
                                 ('RegisteredMFG.',),
                                   ('Unregd. MFG.',),
                     ('Electricity,Gas &amp; W.supply',),
                                   ('Construction',),
                      ('Trade,Hotels&amp; Restaurants',),
                                       ('Railways',),
                        ('Transportby other means',),
                                        ('Storage',),
                                  ('Communication',),
                             ('Banking &amp;Insurance',),
         ('Real, Ownership of Dwel. B.Ser.&amp; Legal',),
                           ('PublicAdministration',),
                                  ('OtherServices',),
                                       ('TotalDDP',),
                             ('Population(In '00)',),
                          ('Per CapitaIncome(Rs.)',)],
        dtype='object')
  </code></pre>
  
  <p>I cannot reference any column using</p>
  
  <pre><code>data_final['economy']['('Construction',)']
  </code></pre>
  
  <p>gives error -</p>
  
  <pre><code>SyntaxError: invalid syntax
  </code></pre>
  
  <p>I tried to use replace to remove the brackets - </p>
  
  <pre><code>data_final['economy'].columns = pd.DataFrame(data_final['economy'].columns).replace("(","",regex=True))
  </code></pre>
  
  <p>But this does not remove the error in column names. How can i remove all these special characters from column names?</p>