How to work with Python 3, how to create virtual environments, to install libraries, to create code skeletons and more. Maybe an IDE for Python is right for you. If you are familiar with IntelliJ, then PyCharm is your option. There are other options such as Visual Studio Code, PyDev, Spyder, so you can choose the one you like the most. And now you have no excuse to start with your first Python project.

1. Learn Python
Level 0: Get into Python

2. 1. GET READY
Only few things before start!

3. WHAT DO YOU NEED?
Python 3
Latest major version of
Python interpreter.
Ubuntu version: 3.5.2
Editor
Your favourite text editor
or IDE (PyCharm,
sublime, VS Code, ...).
Motivation
The best way to learn is
through a motivating
idea.

4. A QUICK REMINDER
Got Virtualenvs?
> sudo apt-get install python3-venv

5. 2. PYTHON BASICS
Start writing code!

6. INTERPRETED
Code and execute. No compilation in between

7. IDLE
Python interpreter at your service

8. USEFUL FUNCTIONS
dir(...)
Inspect objects!
repr(...)
Represent an object
help(...)
Access to help system

9. BASIC TYPES
Numeric
int, float, long, complex
boolean
bool
Sequences
list, str, tuple
Maps
dict
Set
set, frozenset
… and more!
file, deque, ...

10. FUNCTIONS
● Declared using def keyword
● Support default values for arguments
● Python 3.5: Type hinting
● Lambda functions
def sum(a, b):
return a + b
def random_int(min=0, max=10):
return rand.randint(min, max)
lambda_func = lambda a, b: a * b
lambda_func(a, b)

11. CLASSES AND METHODS
● Public and private attributes
● Multiple inheritance
class Sample():
SAMPLE_VAL=3
def __init__(self, val=SAMPLE_VAL):
self.__val = val
def do_something(self, a):
return a + self.__val
@classmethod
def do_static(cls):
return 1

12. ABSTRACTS AND INTERFACES
● A class that raises excepcions on
methods to be implemented
class AbstractSample():
def abs_method(self):
raise NotImplementedError

13. DUCK TYPING
“ If it walks like a duck and it quacks like a duck, then it must be a duck ”

14. INDENTATION
Use blanks to declare scopes. No braces
PEP8 - Style guide for Python coding

15. 3. APP STRUCTURE
Organize your code

16. ENTRYPOINT
Where is my main?

17. APPLICATION ENTRYPOINT
Outermost scope
Instructions in the
outermost scope will be
executed
__name__
Encapsulate the main
instructions inside an if
block (in the outermost
scope)
__main__.py
Explicitly declare the
entrypoint with a special
python module.

18. CODE STRUCTURE
Organize your code

19. PYTHON ARTIFACTS
Modules
Base python artifacts that
encapsulates specific functionality:
○ Statements
○ Constants
○ Functions
○ Classes
○ ...
Packages
Namespaces that encapsulates
modules and packages.
Libraries
Artifacts packaged and published for
their reuse:
○ PyPI

20. 4. LET’S CODE!
Just a little kata to get
involved

21. “Get the bitcoin value

22. BEFORE STARTING
VIRTUALENV
> python3 -m venv venv
> source venv/bin/activate

23. “List latest DATIO blog posts

24. THIRD-PARTY LIBRARIES
INSTALL THEM USING PIP
● requests
● bs4

25. TODO LIST
1. Get HTML code
2. Parse it
3. Scrape it

26. TODO LIST
1. Get HTML code
2. Parse it
3. Scrape it

27. “Do people think Han Solo is a good
film?.

28. TODO LIST
1. Get some tweets
2. Analyze them
3. Visualize the results
4. … and any new ideas

29. WITH
Encapsulate allocation and release of resources

30. YIELD
Generate values on demand

31. LEARNING RESOURCES
● Learn Python in Y minutes
● Codewars
● Planet Python
...
● and practise!

32. AOBYour feedback is highly appreciated

33. THANKS!
Any questions?
@datiobd
japizarro@datiobd.com
datio-big-data