LV - Python

indexing

making and printing the list:

listFood = [“chocolate”, “cheese”, “fruit”]

print(listFood[1])

slicing (start, stop, step)

start stop step refers to the positions

[start:stop:step]

start = the index number the index begins

stop = the index number the index ends

step = the jump range

append()

to add an item to the end of a list:

listNames.append(“sally”)

insert()

to insert an item into a specific place on the list:

listNames.insert(2, “elisa”)

remove()

to remove an item from a list:

listNames.remove(“penelope”)

pop()

takes out an item at a certain index in a list:

listNames.pop(3)

del list[]

deletes permanently the item at a particular index:

del listNames[4]

sort()

sorts a list into ascending order:

listNames.sort()

len()

prints out the number of terms in a list:

print(len(listNames))

index()

returns the number where the item appears in the list:

print(listNames.index(“freya”))

using “in”

“in” is used to say if something is in the list then something else should happen:

if “elsa” in listNames:

validation - range

user is asked to input something between a certain range:

numRange = int(input(“Please enter a number between 11 and 18”))

validation - lookup

user is asked to input something from a store of data:

country = input(“Please enter a country from the list above”)

“==”

to compare terms:

if item == “a”:

nested for loops

a loop inside a loop:

x = [1, 2]

y = [4, 5]

for i in x:

for j in y:

print(i, j)

when do you use a nested loop?

if you have multiple lists that you want to do something with, or if you have a list within a list (a nested list)

def functionName():

the way of naming a function:

def addTwoNumbers():

print(2+2)

Formal parameters

items in brackets which are variables:

def addTwoGivenNumbers(num1 + num2):

print(num1+num2)

Actual parameters

items in brackets which are actual things:

addTwoNumbers(6+7):

print(6+7)

return functions

instead of printing, it is returning something:

def returnAdditionOfTwoNumbers(num1+num2):

return num1+num2