title: How do I get the column names in multiple datasets in python?
body: <p>I am studying Python now.
  I'm handling 12 datasets for case study and I want to check the columns names of each datasets.</p>
  <ul>
  <li>names of datasets : data_202101, data_202102, ... , data_202112</li>
  </ul>
  <p>I wrote 12 same codes to check each datasets' column names like bottom.</p>
  <pre><code>data_202101.columns
  data_202102.columns
  ...
  data_202112.columns
  </code></pre>
  <p>but I want to use only 1 code.
  How I can do that?</p>
  <p>I tried bottom code but it doesn't work.</p>
  <pre><code>for i in range(1:10):
     data = 'data_2021'+i
     data.columns
  </code></pre>
  <p>I am really a beginner so please help me. :)</p>