Slides presented at the Intro to Python workshop, CUNY Hackathon 2019

1. Rucha Gokhale
Mom
Productnaut
Mentor
Lifelong learner
rucha@indyri.se
@ruchagokhale
indyrise/CUNY_hack_2019

2. What brings you here today?

3. Guido van Rossum
https://gvanrossum.github.io

4. Easy and intuitive
Open source
Plain as English
Everyday tasks
**Comic strip courtesy https://xkcd.com/353/

5. http://www.dr-chuck.com
https://www.py4e.com

6. BIG
Data
(or small)
Source
Prepare
Analyze
Report
What’s the “Big” deal with data?

7. Popular data tools...

8. To begin you will need...
○ Python 3+ installed
https://wiki.python.org/moin/BeginnersGuide/Download
Windows: https://www.python.org/downloads/windows/
Mac: https://www.python.org/downloads/mac-osx/
○ A text editor to write python programs
Recommended: https://atom.io/
○ Terminal to run Python

9. Python 2 vs Python 3
https://wiki.python.org/moin/Python2orPython3

10. Example Code Walk-throughs

11. What we will cover today...
○ Variables
○ Functions
○ Conditional execution
○ Iteration
○ Collections (arrays)
○ Importing libraries

12. Exercise 1
“Hello world! My name is”, {X}

13. X = input('Hi there! What is your name?n')
print('Lovely to meet you',X,', welcome to Intro to Python!')

14. “Variable”
container for storing values

15. Rules for variables in Python
○ Must start with a letter or the underscore character
○ Cannot start with a number
○ Can only contain alpha-numeric characters and
underscores (a-z, 0-9, and _ )
○ Are case-sensitive (age, Age and AGE are three
different variables)

16. “Function”
block of code which only runs when it is
called

17. X = input('Hi there! What is your name?n')
if len(X) < 1: X="friend"
def greetname(name):
print('Lovely to meet you',name,', welcome to Intro
to Python!')
greetname(X)

18. Exercise 2
Simple Word Processing

21. File handling (function)
○ Open()function
■ takes 2 parameters: filename and mode
■ Modes: read (r), append (a), write (w),
create (x)|binary (b) or text (t)

22. For loop (iteration)
○ Use for iterating over a sequence
■ list, tuple, dictionary, set or string
■ use break and continue to interrupt the
loop

23. If..else loop (conditional execution)
○ Python relies on indentation to define scope
○ Use If statement and loop to express logical
conditions like a == b, a!= b, a < b etc.
○ else and elif express alternate conditions
○ and / or to combine conditions

24. Collections (or arrays)
○ list = [“a”, “b”, “c”]
■ ordered, changeable
■ duplicates allowed
○ dictionary = {“a”:1, “b”:1, “c”:3}
■ unordered, changeable, indexed
■ duplicates not allowed

25. Exercise 3
NLU (sp. Parts-of-Speech tagging)

26. PIP package manager
○ PIP included by default in Python 3+
■ Package = all files you need for a module
■ Module = Python code libraries you can include in your project
○ Downloading a package
■ $ pip install <package>
○ Using a package
■ import <package>

27. https://spacy.io/usage
En Language Model:
https://spacy.io/usage
/models

29. https://explosion.ai/

30. BEST PRACTICES
Comment, comment, comment
Use a consistent naming convention
Test, test, test
Keep it simple
and
above
all
…
HAVE FUN!!

31. Thank you!
email: rucha@indyri.se | twitter: @ruchagokhale
linkedin: www.linkedin.com/in/ruchagokhale
github: https://github.com/indyrise/CUNY_hack_2019