title: Pandas How to delete rows containing required string
body: <p>I want to delete all rows containing required string ,</p>
  
  <p>Suppose I have following dataframe:</p>
  
  <pre><code>A    B    C
  1    a    x
  w    g    n
  3    l    p
  j    p    v
  </code></pre>
  
  <p>I want to delete all rows containing string <code>p</code>. I have search for it but most of the answer is on the basis of column name , in my case I will not be aware of column it can be present in any of the column. </p>
  
  <p>Output dataframe should be</p>
  
  <pre><code>A    B    C
  1    a    x
  w    g    n
  </code></pre>