title: How to get all child components of QWidget in pyside/pyqt/qt?
body: <p>I am developing a desktop application using pyside(qt), I want to access(iterate) all line edit components of QWidget. In qt I found two methods <i>findChild</i> and <i>findChildren</i> but there is no proper example found and My code shows error, <i>'form' object has no attribute 'findChild'.</i>
  Here 'form' is Qwidget form consist components lineEdit, comboboxes, Qpushbuttons etc.</p>
  
  <p>Code:</p>
  
  <pre><code>lineEdits = form.findChild&lt;QLineEdit&gt;() //This is not working
  
  lineEdits = form.findChild('QLineEdit) //This also not working
  </code></pre>