title: Replace a specific character in a dataframe column with another character
body: <p>I have this dataframe:</p>
  <pre><code>       symbol                      date      open     high      low    close        volume
  0    BTC/USDT 2020-03-28 00:00:00+00:00   6243.25   6298.5   6028.0   6237.5  3.888942e+03
  1    BTC/USDT 2020-03-29 00:00:00+00:00   6233.50   6262.5   5869.5   5876.5  1.140766e+05
  2    BTC/USDT 2020-03-30 00:00:00+00:00   5876.00   6609.0   5856.0   6396.5  2.242312e+05
  3    BTC/USDT 2020-03-31 00:00:00+00:00   6397.00   6523.5   6330.5   6411.0  1.702458e+05
  4    BTC/USDT 2020-04-01 00:00:00+00:00   6410.00   6685.5   6155.5   6646.0  6.872307e+05
  ..        ...                       ...       ...      ...      ...      ...           ...
  599  BTC/USDT 2021-11-17 00:00:00+00:00  60060.00  60820.0  58347.0  60348.0  1.627009e+08
  600  BTC/USDT 2021-11-18 00:00:00+00:00  60348.00  60955.0  56474.0  56891.0  1.905533e+08
  </code></pre>
  <p>I need to replace the &quot;/&quot; in the symbol column with &quot;-&quot;.</p>
  <p>Code I have tried:</p>
  <pre><code>df['symbol'] = df['symbol'].replace(['/'], '-')
  df['symbol'] = df['symbol'].replace(['/'], '-', inplace=True)
  df['symbol'] = df.replace('/', '-')
  df = df.replace(to_replace='\/', value='-', regex=True)
  </code></pre>
  <p>I know it's something simple, but I'm not getting it.</p>