Download python 3 from http://python.org/download/

Install Python

Open terminal / cmd window

Type “python3” to start Python in interactive mode

 > pip3 install jupyter

 > pip install jupiter

Variables store values of different types:

string - a sequence of characters, comprising text [”a”, “London”, “X”]

int - an integer, or whole number [1,5,9999, ...]

float - a floating point number (using a decimal point) [3.14, 1.68, 1.0, ...]

bool - boolean; binary true or false values [True, False]

We can store multiple values in a list:

>>> l = [1,3,9,4,884328881]
>>> n = ['sex', 'drugs', 'rock', 'roll']
>>> m = l + n
>>> m
[1, 3, 9, 4, 884328881, 'sex', 'drugs', 'rock', 'roll']

>>> l = list(range(10))
>>> l
[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
>>> l[1:5]
[1, 2, 3, 4]
>>> l[:5]
[0, 1, 2, 3, 4]
>>> del l[5:]
>>> l
[0, 1, 2, 3, 4] >>> l.append(5)
>>> l
[0, 1, 2, 3, 4, 5] >>> l.reverse()
>>> l
[5, 4, 3, 2, 1, 0]
>>> 5 in l
True

Lists are sequences, and so are Strings

>>> s = "General Assembly"
>>> s[0]
'G'
>>> s[:7]
'General' 

Dictionaries store key:value pairs associatively.

personX = {
  'first':'J', 
  'last':'Rogel', 
  'twitter':'@quantum_tunnel'
}

>>> personX = {'first':'J', 'last':'Rogel', 'twitter':'@quantum_tunnel'}
>>> personX['first']
'J'
>>> personX['id'] = 31415
>>> personX
{'twitter': '@quantum_tunnel', 'last': 'Rogel', 'id': 31415, 'first': 'J'}

You use loops to repeat a statement.

A for-loop is useful when you know how many times you want to repeat an action (e.g. for every item in a list)

for item in sequence:
     do someting with item
 

A while-loop  is useful when you don’t know when you want to stop looping yet.

A while-loop statement checks a condition and loops until the condition is no longer satisfied.

while condition true:
     do something

Conditional statements enable you to deal with multiple options. 

A part of your code is executed based on the truth value of a condition. 

You perform conditional checks with: if, (elif), (else)

if condition:
   action
elif other condition:  # optional
   other action
else:                  # optional
   final action

>>> age = 17
>>> if age < 18:
...     print("no drinks for you")
... 
no drinks for you

Functions perform a collections of tasks, bundled under a specific name

Take input argument(s), execute statement(s), return output

Input and output can be of all different types

>>> name = "J Rogel"
>>> length = len(name)
>>> print(length)
7
>>> type(length)
<type 'int'>