Chapter 1

Front 1

How to print to the screen and accept input in python

Back 1

variableName = input("your text here")

- this will print the text to the screen and wait for a user to press enter (presumably after they have typed their response)

- this will store the response as a String (event tho you don't declare a type anywhere).

- You cannot multiple this String by an number, you will get a TypeError.. again even tho you don't declare types anywhere

Front 2

How to convert a string into an int

Back 2

variableName = int(your string variable here)

Front 3

how to import modules

Back 3

import moduleName

Front 4

How to print things to the screen

Back 4

print("Your string", aVariableIfYouWant, "AnotherStringIfYouWant")

Front 5

python parses its statements of code by EACH line. thus if you have a statement of code that is too long to fit on 1 line, how to do break it into multiple lines

Back 5

break them apart with the \ character, then at least 1 space to indent the next line

variableName = math.pi * \

numberVariable + 45

notice the space before numberVariable (must have at least 1 space)

Front 6

How to make comments in python

Back 6

# write a comment here

Front 7

how to declare types in python

Back 7

there are no primatives in python, everything is an object.

To declare an int, float or string etc.., you pass the value into its constructor which outputs the value so you can store it in a variable

variableNameInt = int(56)

variableNameStr = "heres a string" or 'heres a string'

- strings are declared with either " " or ' '

Front 8

How to cast a float as an integer

Back 8

int(float)

Front 9

what if you divide two integers and the result is a fraction?

Back 9

Python will convert the result into a float automatically

Front 10

what if you only wanted the number of times a number divided into another number?

Back 10

You could cast it like so:

int(4/3)

or you could use the provided operator:

4//3

either way the result is 1

You could return a float version of this if 1 of the number are a float:

4//3.0 = 1.0

Front 11

How about remainders

Back 11

Same as java: use modulo %

Front 12

What about exponent

Back 12

use two asterisks ** like so:

3**3 = 27

Front 13

Accumulators and other similar shortcuts

Back 13

All the same as java

+=

-=

/=

*=