title: skip specific line that contains certain value when you read pandas data frame
body: <p>When you read the csv using command pd.read_csv,
  How do I skip the line that contains specific value in a row? 
  If in 50th, 55th row, the 1st column has the value, 100, so I want to skip those lines when I read the csv file. 
  How I can put those command in a read-in command like pd.read_csv('read.csv')?
  total length of the value is 300. </p>