title: Multiple similar columns with similar values
body: <p>The dataframe looks like:</p>
  <pre><code>  name      education        education_2          education_3
  name_1            NaN       some college                  NaN
  name_2            NaN                NaN      graduate degree
  name_3    high school                NaN                  NaN
  </code></pre>
  <p>I just want to keep one education column. I tried to use the conditional statement and compared to each other, I got nothing but error though. I also looked through the merge solution, but in vain. Does anyone know how to deal with it using Python or pandas? Thank you in advance.</p>
  <pre><code>  name            education
  name_1         some college
  name_2      graduate degree
  name_3          high school
  </code></pre>