title: How can I read multiple csv file from different sub directories and find the csv file which has the value?
body: <p>Let's say I have a root directory(folder) <code>z</code> and <code>i</code> have three sub-directory(folders) <code>a, b,</code> and <code>c</code></p>
  
  <p>Each <code>a, b,</code> and <code>c</code> contain one <code>csv</code> file which are similar data and have similar names <code>a_data, b_data,</code> and <code>c_data)</code></p>
  
  <p>Out of three <code>csv</code> files, only one <code>csv</code> contains the value of integer <code>100</code> inside data frame.``</p>
  
  <p>How can I design a loop that scans all <code>csv</code> inside three sub-folders and tells me which <code>csv</code> has the value "100"? </p>
  
  <p>Thanks alot!  </p>