Calling a Value in a List using While Loop

Question

is there any way to know if the previous appended value is greater than the newly appended value using while loop

unifarr = []
forwarr = []
while t :
unif = randint(-75, 75)  # To move face in every possible angle
forw = randint(-1, 1)  # Move every 1 pixel, -1 for back 1 for forward
t.left(unif)
t.forward(forw)
sleep(0.01)
forwarr.append(forw) 
unifarr.append(unif)# check if prev. value is < or > than newly appended value

i am using random that appends in an array is there any possible way to check if the previous appended random value is greater than the newly appended value

assume forwarr is a list, you could do if forwarrr[-1] > forw — shahkalpesh
– shahkalpesh, Commented Feb 13, 2021 at 18:35

Rustam Garayev · Accepted Answer · 2021-02-13 18:35:41Z

1

You can create your base case outside while loop and check whether the newly created number is greater than the base case or not. If greater, you do your stuff and finally set your previous to new number for future iterations. Something like this would do the job:

from random import randint

previous_forv = randint(-75, 75)
previous_unif = randint(-1, 1)
forwarr = [previous_forv]
unifarr = [previous_unif]

while t:
    new_forv = randint(-75, 75)
    new_unif = randint(-1, 1)

    t.left(unif)
    t.forward(forw)
    sleep(0.01)
    
    if new_forv > previous_forv:
        forwarr.append(new_forv)
        previous_forv = new_forv

    if new_unif > previous_unif:
        unifarr.append(new_unif)
        previous_unif = new_unif

answered Feb 13, 2021 at 18:35

Rustam Garayev

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Comments

mujjiga · Accepted Answer · 2021-02-13 18:38:14Z

1

you can index using negative number to index the list from the other end. i.e with -1 you will get the last value with -2 second last value and so on.

if unif > unifarr[-1]:
   print ("is greater")
else:
  print ("is not greater")

unifarr.append(unif)

OR

unifarr.append(unif)

if unifarr[-1] > unifarr[-2]:
   print ("is greater")
else:
  print ("is not greater")

answered Feb 13, 2021 at 18:38

mujjiga

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