If you have any questions, comments or issues with this project please post them here!
hi guys! i’m struggling with day 44 exercise. the error i’m getting is “list index out of range” on line 39.
could someone help me out please?
print("--- David's Nan Bingo Card Generator ---")
print()
import random, os, time
bingo = []
def ran():
number = random.randint(1,90)
return number
def prettyprint():
for row in bingo:
for item in row:
print(item, end ="\t|\t")
print()
def createCard():
global bingo
numbers = []
for i in range(8):
num = ran()
while num in numbers:
num = ran()
numbers.append(ran())
numbers.sort()
bingo = [ [numbers[0], numbers[1], numbers[2]],
[numbers [3], "BINGO", numbers [4]],
[numbers[5], numbers[6], numbers[7]]
]
createCard()
while True:
prettyprint()
num = int(input("next number: "))
for row in range(3):
for item in range(3):
if bingo[row][item] == num:
bingo[row][item] = "X"
exes = 0
for row in bingo:
for item in row:
if item == "X":
exes += 1
if exes == 8:
print ("you win")
break
time.sleep(1)
os.system("clear")
This is an example of why formatting code correctly is so important, not only does it make it look nice and easier to read for others (and yourself), bad formatting, like in this case, can sometimes be the cause of bugs (especially since Python syntex uses whitespaces).
This works fine:
print("--- David's Nan Bingo Card Generator ---")
print()
import random, os, time
bingo = []
def ran():
number = random.randint(1, 90)
return number
def prettyprint():
for row in bingo:
for item in row:
print(item, end="\t|\t")
print()
def createCard():
global bingo
numbers = []
for i in range(8):
num = ran()
while num in numbers:
num = ran()
numbers.append(ran())
numbers.sort()
bingo = [[numbers[0], numbers[1], numbers[2]],
[numbers[3], "BINGO", numbers[4]],
[numbers[5], numbers[6], numbers[7]]]
createCard()
while True:
prettyprint()
num = int(input("next number: "))
for row in range(3):
for item in range(3):
if bingo[row][item] == num:
bingo[row][item] = "X"
exes = 0
for row in bingo:
for item in row:
if item == "X":
exes += 1
if exes == 8:
print("you win")
break
time.sleep(1)
os.system("clear")
1 Like
Hi there!
Could someone please explain why I cannot do this when looking for a number in my bingo card and replace it with “X”
for row in bingolist:
for item in row:
if bingolist[row][item] == number:
bingolist[row][item] = "X"
Xs += 1
I’ve seen I’m supposed to use range(3), which makes sense but doesn’t look natural to me. It means you need to know the number of rows and items in your list when replacing an item?
Have a nice day!
A for in loop in Python iterates through items, not indexes, so bingolist[row][item] will likely throw an error since you’ll be trying to access something like bingolist[[ 83, 24, 37 ]][37]. Check this out on W3Schools (I recommend trying the Try it yourself code as you’ll get a better understanding of what I mean).
2 Likes
Hi everyone! I’ve never seen the “global” in “global bingo” and David didn’t really touch on it in the video explanation. Can someone explain what it does? I couldn’t figure this challenge at all. I started with the previous day’s code plus the hangman code thinking I could use a “allBingo = True” to do the X replacing but it didn’t work out. Anyways, thank for the help!
Hi @laurenjane thanks for your message and apologies for the delay in responding to you. Can you please share a link to your Repl so I can explain using your code?
regarding the solution. i didn’t understand what the “while num in numbers:” in the createCard subroutine did, so i thought about it.
def createCard():
global bingo
numbers = []
for i in range(8):
num = ran()
while num in numbers:
num = ran()
numbers.append(ran())
it took me a while to understand that it is supposed to prevent repetition of numbers, but doesn’t work. (tested via reduction of the range of the random numbers generated). it took another while for me to realize why:
numbers.append(ran())
should have been
numbers.append(num)