Dynamic Lists

Dynamic lists are ways of using a blank list and adding or removing items to it as we go

Blank lists

EXAMPLE :

MYAGENDA = []

Append a list

.append will let us add whatever is in () to the list.

EXAMPLE:

myAgenda = []

def printList():

for item in myAgenda:

print(item)

while True:

item = input("What's next on the Agenda?: ")

myAgenda.append(item)

printList()

Removing Items from a List

how using .remove will remove what is inside the ().

EXAMPLE:

myAgenda = []

def printList():

print()

for item in myAgenda:

print(item)

print()

while True:

menu = input("add or remove?: ")

if menu == "add":

item = input("What's next on the Agenda?: ")

myAgenda.append(item)

elif menu == "remove":

item = input("What do you want to remove?: ")

myAgenda.remove(item)

printList()

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CONTINUE COMMAND AND EXIT LINE

The Continue Command The continue command stops executing code in the loop and starts at the top of the loop again. Essentially, we want to kick the user back to the original question. EXAMPLE : while True: print("You are in a corridor, do you go left or right?") direction = input("> ") if direction == "left": print("You have fallen to your death") break elif direction == "right": continue else: print("Ahh! You're a genius, you've won") NOTE : The else statement refers to any input besides left or right (up or esc). Since the user is a winner, we do not want to use break or it would say they have failed. EXIT COMMAND LINE The previous code continues to loop even after the user has won. Let's fix that with the exit() command EXAMPLE: print("Let's play chutes and ladders. Pick ladder or chute.") while...

FOR LOOP , RANGE

FOR LOOP A while loop is perfect to use when we don't know how many times we want the loop to repeat. If we have an idea of how many times we want the loop to repeat, we can use a for loop to loop code in exactly the same way the while loop did. EXAMPLE : for counter in range(10): print(counter) RANGE The range function creates a list of numbers in the range you create. If you only give it one number, it will start at 0 and move to a state where the final number is one less than the number in the brackets. In this case, the final number would be 9 . EXAMPLE : total = 0 for number in range(100) : total += number print(total)

WHAT IS WHILE TRUE LOOP AND TO STOP THE LOOP

while True Loop EXAMPLE (THIS WILL NOT STOP) : while True: print("This program is running") print("Aww, I was having a good time 😭") MAKE IT STOP There is a way to stop the loop with the word break . This exits the loop and stops all code at that point. Even if there is more code written after break that is inside the loop. EXAMPLE : while True: print("This program is running") goAgain = input("Go again?: ") if goAgain == "no": break print("Aww, I was having a good time 😭")

PYTHON SYNTAX

Dynamic Lists

Dynamic Lists

Dynamic lists are ways of using a blank list and adding or removing items to it as we go

Blank lists

EXAMPLE :

MYAGENDA = []

Append a list

.append will let us add whatever is in () to the list.

EXAMPLE:

myAgenda = []

def printList():

for item in myAgenda:

print(item)

while True:

item = input("What's next on the Agenda?: ")

myAgenda.append(item)

printList()

Removing Items from a List

how using .remove will remove what is inside the ().

EXAMPLE:

myAgenda = []

def printList():

print()

for item in myAgenda:

print(item)

print()

while True:

menu = input("add or remove?: ")

if menu == "add":

item = input("What's next on the Agenda?: ")

myAgenda.append(item)

elif menu == "remove":

item = input("What do you want to remove?: ")

myAgenda.remove(item)

printList()

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CONTINUE COMMAND AND EXIT LINE

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