Untitled

To store values in reference to other values:

dict = {'key1' : 1, 'key2' : 2, 'key3' : 3}

dict is the dictionary variable name

dict [’key1′] will output 1

dict[’key1′] = 5 will add/change the word in dictionary

del dict[’key2′] will delete key2 from the dictionary

For a list within a dictionary:

dict[’list_name’] = [’item1′, ‘item2′, ‘item3′]

dict[’list_name’].remove(’item2′)

In a list:

for var in list_name:

for will cycle through the list, with var taking the value of the component for is “looking at”

In a dictionary:

for var in dictionary:

list_name = [ "x”, “y”, “z”]

list_name [0] = “x”

to change “x” to “v”: listname [0] = “v”

list_name.append(”a”) adds an a to the end

list [0:2] will output [”x”, “y”], it goes up to but does not include element 2

list[1:] will output [”y” “z”], colon means an index is unnecessary if it goes all the way to beginning or end

list_name.index(”y”) = 1

list_name.insert(index#, string) will insert string at given index number

list_name.sort() puts lists in alphabetical/numerical order

Removing Items from a List

list_name.remove(’item’) will search the list for ‘item’ and then remove item from the list

listname.pop(index) will remove the item at index and return that item

Strings

Numbers

Booelans

type (argument) will return:

int (if argument is integer)

float (if argument is floating point)

str (if argument is string)

“A module is a file that contains definitions—including variables and functions—that you can use once it is imported.”

For example, importing the math module allows for Python to do square roots

To import everything,

import module

To only import specific things from a module, 

from module import function

For a specific use,

Exponent: ** (ex. 2 ** 3 = 8)

Define a function:

def functionName (inputs) :

             interior of function contains commands

Call a function:

functionName( input1, input2, input3...)

String indexing starts at 0

string(#) calls on index # in string

Note: may set var = “string” and perform these functions on var

Length: len(string) will return number of characters

Ensure all characters: string.isalpha() will return boolean, True or False

Lowercase: string.lower()

Uppercase: strong.upper()

str(input) turns input into a string

var = raw_input(”string to print for user view”)

Example: asking a name

print “string”

print ‘string’

print variable

print "%d to the power of %d is %d." % (base, exponent, result)

True

False

and

not

5 > 4

4 < 5

5 == 5

5 != 4

max(argument1, argument2, argument3)

min(argument1, argument2, argument3)

if var == value:

                consequence such as:

                print “response”

                return True

elif: # short for else if

               consequence

else:

Very First Parentheses

First not

Next and