If you are interested in web development, then better, perhaps, after studying the basic syntax of python to start with django, if you now use the web frameworks in php type symfony or zend. In this case, it is not necessary, IMHO, to delve into the intricacies of Python as a language, and it is better to read something by django and either start writing your project, or to join the many already available, studying the actual language and the standard library as needed. The second option is a valuable opportunity to get the proper feedbacks on your code and not continue to write php just changing the syntax, but leaving the same approaches.