title: How to perform append with if condition for multiple array
body: <p>I am writing the following code in Python, I want to accomplish the following using a for condition</p>
  <pre><code>                if (datetime_obj.hour==7):
                      hour7.append(a)
                  if (datetime_obj.hour==8):
                      hour8.append(a)
                  if (datetime_obj.hour==9):
                      hour9.append(a)
                  if (datetime_obj.hour==10):
                      hour10.append(a)
                  if (datetime_obj.hour==11):
                      hour11.append(a)
                  if (datetime_obj.hour==12):
                      hour12.append(a)
                  if (datetime_obj.hour==13):
                      hour13.append(a)
                  if (datetime_obj.hour==14):
                      hour14.append(a)
                  if (datetime_obj.hour==15):
                      hour15.append(a)
  </code></pre>
  <p>hour are empty arrays.</p>