Python/Basic Code

variables

variables can be integers, floats, or boolean. Integers are whole numbers, floats are numbers with remainders, boolean is either True of False.

variable=integer

convert int to string

age = 13
print str(age)

convert string to int

n1 = "100"
n2 = "10"
int_addition = int(n1) + int(n2)

arithmetic operators

add/subtract/multiply/divide/exponentiation/modulo

exponentiation (exponential, similar to square roots)

2 ** 3=8   (2*2*2)

modulo (remainder)

5 % 2=1  (5/2 = 2 with a remainder of 1)

shorthand

+= add vars and update first var
ie. sandwich_price += sales_tax

-= subtract vars and update first var
ie. money_in_wallet -= sandwich_price

float vars

If you want the fraction included in the var, you need to define it as a float, otherwise python will automatically round the result to a whole number.

 floating_var = float(7)/2

This will give you the fraction from dividing 7/2.

comments

# for single like quote or """ quote """ for multi line quote

#quote
"""quote
quote"""

print

display output

print "Hello World"

display specific letter, left to right, 0 forward

print "TEST"[0] = "T"

multi-line string

for strings that span multiple lines, use triple quotes

address_string = """136 Whowho Rd
Apt 7
Whosville, WZ 44494"""

remove character value

like with regular expression, you can remove a characters normal value by adding \ in front, however this does not work with all characters in python

'Help! Help! I\'m being repressed!'

string methods

len() ; lower() ; upper() ; str()

len() = get length of string - applies to anything within the parentheses

len(length)   =   6

lower() = convert to lowercase - applies to only the value after the .

LOWERCASE.lower()   =   lowercase

upper() = convert to uppercase - applies to only the value after the .

uppercase.upper()   =   UPPERCASE

str() = convert to string - applies to anything within the parentheses

str(3.14)   =   "3.14"

user input

variable = raw_input("display message")

name=raw_input("display message")

Comparators

==, !=, <, <=, >, or >=

Boolean Operators

and, or, or not

true, false

True and True is True
True and False is False 
False and True is False
False and False is False

True or True is True
True or False is True
False or True is True
False or False is False

Not True is False
Not False is True

Conditional Statements

if, else, and elif.

def clinic():
   print "You've just entered the clinic!"
   print "Do you take the door on the left or the right?"
   answer = raw_input("Type left or right and hit 'Enter'.").lower()
   if answer == "left" or answer == "l":
       print "This is the Verbal Abuse Room, you heap of parrot droppings!"
   elif answer == "right" or answer == "r":
       print "Of course this is the Argument Room, I've told you that already!"
   else:
       print "You didn't pick left or right! Try again."
       clinic()

clinic()

slice

parse certain characters from a variable

x=variable
print x[1:3]
ari

x=variable
print [3:len(x)]
iable