CODEWITHSUNDEEP
pythonlistinttypeerror
Donoru
Donoru

Reputation: 155

Python 3.8 "TypeError: 'int' object is not iterable" when trying to add an int to a list

I am making a program where it generates a random number from 1 to 100 and then, if that number isn't already in the list, it adds it to the list and keeps doing that until there is 100 unique numbers in the list. This is my code so far:

from random import randint
numbers = []
loop = True
while loop == True:
  number = randint(1, 100)
  if number in numbers:
      print("{} is there already!".format(number))
  else:
    numbers += number

But it keeps giving me this error:

Traceback (most recent call last):
  File "main.py", line 9, in <module>
    numbers += number
TypeError: 'int' object is not iterable

But, as I'm pretty sure, there's nothing wrong with my code. What do I do?

Upvotes: 1

Views: 720

Answers (3)

Pratyaksh Saini
Pratyaksh Saini

Reputation: 113

I think you are trying to add random numbers from 1-100, randomly in numbers list and you don't want to add anything more than once

from random import randint
numbers = []
loop = True
while loop == True:
  number = randint(1, 100)
  if number in numbers:
      print("{} is there already!".format(number))
  else:
    numbers += [number]

This will do.

I think you should use append instead of adding, because it takes much less time. It will look like this

from random import randint
numbers = []
loop = True
while loop == True:
  number = randint(1, 100)
  if number in numbers:
      print("{} is there already!".format(number))
  else:
    numbers.append(number)

Upvotes: 1

Kuldeep Singh Sidhu
Kuldeep Singh Sidhu

Reputation: 3856

If you just want to create a shuffled list with unique numbers from 1 to 100

This can be a more efficient code

my_list = list(range(1,101))
random.shuffle(my_list)
print(my_list)

You can fix the random seed so the output is shuffled but doesn't change every time you run

my_list = list(range(1,101))
random.seed(123)
random.shuffle(my_list, random=None)
print(my_list)

As for your code, you cannot do += for a list use .append (which takes your number as an argument and adds that to end of your list)

numbers.append(number)

DOCS: https://docs.python.org/2/tutorial/datastructures.html

Upvotes: 1

F.M
F.M

Reputation: 1869

Just replace numbers += number with numbers.append(number).

Upvotes: 2

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