Python Introduction Workshop

An introductory workshop to the Python programming language

Transcript

1. Python Python Intro Workshop
2. bureaucracy history, facts and wikipedia ;)
3. bureaucracy - the boring part 3 • Created by Guido Van Rossum, a dutch developer • Developed by Python Software Foundation • First appearance in 20 February 1991 • Free and Open-source with community based development • Most common uses: ◦ Scripting ◦ Small programs ◦ Web (Django, Flask, Wagtail, …)
4. • multiparadigm - imperative, functional, OO, … • memory management built-in • dynamic types and indentation aware • versions matter! Python2.* != Python3 • Python3 isn’t backwards compatible, for instance: ◦ bunch of new reserved methods ◦ syntax changes on print, exception handling and others. ◦ input() function always returns str values in py3 bureaucracy - boring but kind of important 4 More info: http://sebastianraschka.com/Articles/2014_python_2_3_key_diff.html
5. • Python is based on following philosophy: ◦ Beautiful is better than ugly ◦ Explicit is better than implicit ◦ Simple is better than complex ◦ Complex is better than complicated ◦ Readability counts • A consenting adults language • Designed to be highly extensive ◦ Small core, big standard library the pythonic ideals or why I <3 Python 5
6. syntax & semantic history is fun and all but how does it really work?!
7. syntax & semantic - data types/structures 7 types: • numerical ◦ int ◦ float • booleans • no value structures: • tuples • lists • dictionaries (dict)
8. syntax & semantic - operators and expressions 8
9. syntax & semantic - indentation 9 • python uses indentation (white space) to know where code blocks end • a block with no code is represented with the keyword pass …. ….…. ….….….
10. syntax & semantic - flow control 10 • like any other language python uses if, elif and else as conditional expressions • if and elif are followed by the logical condition between parenthesis ( )
11. syntax & semantic - loops 11 • the usual looping instruction used is for and can be used to ◦ iterate through elements ◦ iterate through a range • while (looping condition): is also available as a loop mechanism
12. syntax & semantic - I/O 12 • input and output can be done with resource to the module io • for instance, getting input from the user is done using input(“input request string”)
13. syntax & semantic - slicing 13 • slicing is one of the most pythonic things to use • just_a_list[1:9:2] represents the list elements from the index 1 to index 9, with step 2
14. • dictionaries, dicts for short, are the most used python structure • equivalent of maps in the sense of mapping a value to a key • similar to Json objects syntax & semantic - dictionaries (dicts) 14 Dicts API: https://www.tutorialspoint.com/python/python_dictionary.htm
15. syntax & semantic - functions 15 • functions are declared with the def function_name (arguments=default_value): • a function may or may not return something • to return something, the return statement is used
16. syntax & semantic - other stuff 16 • Imports can be to a full module • Or to specific content within a module • Content within a module is accessed through module_name.content_name
17. exercises let’s get our hands in the pasta about time ~_~
18. • Text Editor ◦ VIM/VI ◦ Atom ◦ Sublime • Python3 • Google (trust me) exercises - what you’ll need 18 That’s about it ! :D Python3 online: https://repl.it/languages/python3
19. • Write a script that prints the string “Hello World!” Too easy? exercises - Hello World 19
20. • Write a script that: ◦ Reads two numbers ◦ Adds them ◦ Prints the result Comeonnnnnnnnnn :bored: exercises - I/O 20
21. • Write a script that: ◦ Reads a number from the user ◦ Tries to the given number in this list: [1, 2, 314, 69, 666, 7, 10, 5, 13] Still easy, right? exercises - find a number in a list 21
22. • write a script that: ◦ sums the even numbers until 1000 ◦ sums the odd numbers until 1000 ◦ prints the results exercises - sum evens and odds until 1000 22
23. • official documentation ◦ https://docs.python.org/3/ • codecademy ◦ https://www.codecademy.com/learn/python Python — more info 23
24. questions? Anything that made you go o.O
25. thank you! :D Hugo Gonçalves hmrvbg@gmail.com