uwspstar / python

Python

https://docs.python.org/3.7/tutorial/index.html

• Amazon : Build a Modern Web Application in Python

https://aws.amazon.com/getting-started/projects/build-modern-app-fargate-lambda-dynamodb-python/

• Heroku : Getting Started on Heroku with Python

https://devcenter.heroku.com/articles/getting-started-with-python

Learn Python by Building a Blockchain & Cryptocurrency by Maximilian Schwarzmüller

https://www.udemy.com/learn-python-by-building-a-blockchain-cryptocurrency

05/19/2019

• This is especially important on macOS, where you already got Python 2.7 pre-installed. To NOT use that, run python3 instead of python .

• install vscode https://www.udemy.com/learn-python-by-building-a-blockchain-cryptocurrency/learn/v4/t/lecture/10030512?start=0

• "-"*30 . // print line wiht 30 -

• 1 - 0.9 = 0.09999999999998

• str = 'I 'M cool'

• *** //multiple line

• \n //new line

x = int(1)   # x will be 1
y = int(2.8) # y will be 2
z = int("3") # z will be 3

x = float(1)     # x will be 1.0
y = float(2.8)   # y will be 2.8
z = float("3")   # z will be 3.0
w = float("4.2") # w will be 4.2

x = str("s1") # x will be 's1'
y = str(2)    # y will be '2'
z = str(3.0)  # z will be '3.0'

• blockchain[-1] // get the last one

05/20/2019

• https://hackr.io/tutorials/learn-python
• Python 3.7.3 documentation https://docs.python.org/3/
• Unlike strings, which are immutable, lists are a mutable type, i.e. it is possible to change their content:

>>> cubes = [1, 8, 27, 65, 125]  # something's wrong here
>>> 4 ** 3  # the cube of 4 is 64, not 65!
64
>>> cubes[3] = 64  # replace the wrong value
>>> cubes
[1, 8, 27, 64, 125]

• 2 ** 7 # 2 to the power of 7 //128
• String literals can span multiple lines. One way is using triple-quotes: """...""" or '''...'''.
• word[2:5] # characters from position 2 (included) to 5 (excluded)
• Note how the start is always included, and the end always excluded. This makes sure that s[:i] + s[i:] is always equal to s:
• the length of word[1:3] is 2

word = 'python'
>>> word[:2]   # character from the beginning to position 2 (excluded)
'Py'
>>> word[4:]   # characters from position 4 (included) to the end
'on'
>>> word[-2:]  # characters from the second-last (included) to the end
'on'

• len(s)

All slice operations return a new list containing the requested elements. 
This means that the following slice returns a new (shallow) copy of the list:

>>> squares[:]
[1, 4, 9, 16, 25]

05/21/2019

• PEB 8 - Style Guide: https://www.python.org/dev/peps/pep-0008/