title: why pandas read_csv assuming that my first column is an index?
body: <p>I read csv from text file seperate by comma.</p>
  <p>it took me a loot of time to realize that pandas read my first columns as index.</p>
  <p>after I read the link below I used &quot;index_col=None &quot;  to cancel it.</p>
  <p><a href="https://stackoverflow.com/questions/21902080/python-pandas-not-reading-first-column-from-csv-file">python pandas not reading first column from csv file</a></p>
  <p>the question is :  why, by defult, pandas decide that my first columns is index?</p>