Merge pull request #32 from FedeGall/master

Changes program session 4

Author: fabrizioleone

README.md

@@ -7,7 +7,7 @@ The schedule goes as follows (**always 10-12AM in room R42.3.103**).
 | [Session 1](https://github.com/Python-do-ECARES/Classes/tree/master/Session_1)       | 11/02/2020   | Glenn       | Reproducible research, automation and introduction to the course | Slides / [Gentzkow and Shapiro](https://web.stanford.edu/~gentzkow/research/CodeAndData.pdf)|
 |  [Session 2](https://github.com/Python-do-ECARES/Classes/tree/master/Session_2)      | 18/02/2020   | Fabrizio    | Jupyter (Anaconda), Git, GitHub, GitHub Desktop |                     Slides / [QuantEcon](https://python.quantecon.org/getting_started.html)                                                                           |
 | [Session 3](https://github.com/Python-do-ECARES/Classes/tree/master/Session_3)       | 25/02/2020   | Federico            | Variables, numbers, strings, lists, functions, tuples, sets, dictionaries, lists comprehension, for and while loops, if statements, other logical operators |  [Udemy - Section 1:"Intro to Python" and Section 2:"Python fundamentals"](https://www.udemy.com/course/the-complete-python-course/learn/lecture/9412506#overview), [QuantEcon - An Introductory Example](https://python.quantecon.org/python_by_example.html) and [Python Essentials](https://python.quantecon.org/python_essentials.html)      |
-| [Session 4](https://github.com/Python-do-ECARES/Classes/tree/master/Session_4)       | 03/03/2020   |             | Classes, handling errors (including try and except), files |            [Udemy - Section 4:"Object-Oriented Programming with Python", Section 5:"Errors in Python", Section 6:"Files in Python"](https://www.udemy.com/course/the-complete-python-course/learn/lecture/9412506#overview), [QuantEcon - OOP I](https://python.quantecon.org/oop_intro.html), [Building Classes](https://python.quantecon.org/python_oop.html) and [Debugging](https://python.quantecon.org/debugging.html)           |                                                                          
+| [Session 4](https://github.com/Python-do-ECARES/Classes/tree/master/Session_4)       | 03/03/2020   | Alberto, Marco & Giampaolo            | Loops and Functions (Part 2) |      |                                                                          
 | [Session 5](https://github.com/Python-do-ECARES/Classes/tree/master/Session_5)       | 10/03/2020   |       Angela, Moritz & Thomas      |APIs|     [Udemy - Section 16:"Interacting with APIs with Python"](https://www.udemy.com/course/the-complete-python-course/learn/lecture/9412506#overview)     |
 | [Session 6](https://github.com/Python-do-ECARES/Classes/tree/master/Session_6)       | 17/03/2020   |       Charles      | Web Scraping, regular expressions, Selenium|     [Udemy - Section 10:"Advanced Python Development", Section 11:"Web Scraping with Python", Section 12:"Browser Automation with Selenium"](https://www.udemy.com/course/the-complete-python-course/learn/lecture/9412506#overview)                                                                                                                                     |
 | [Session 7](https://github.com/Python-do-ECARES/Classes/tree/master/Session_7)       | 24/03/2020   |    Cristina & Remi         | Pandas |                    [QuantEcon - Pandas](https://python.quantecon.org/pandas.html) and [QuantEcon- DataScience](https://datascience.quantecon.org/pandas/)                                                                                                                       |