title: Prevent pandas.read_csv from inferring dtypes
body: <p>How to prevent <code>pandas.read_csv()</code> from inferring the data types. For example, its converting strings <code>true</code> and <code>false</code> to Bool: <code>True</code> and <code>False</code>. The columns are many for many files, therefore not feasible to do:</p>
  
  <p><code>df['field_name'] = df['field_name'].astype(np.float64)</code> for each of the columns in each file. I prefer pandas to just read file as it is, no type inferring.</p>