Removing a num from a string in a list of numbers - python-3.x

Question

An example like:
print("1.", get_list_nums_without_9([589775, 677017, 34439, 48731548, 782295632, 181967909]))
print("2.", get_list_nums_without_9([6162, 29657355, 5485406, 422862350, 74452, 480506, 2881]))
print("3.", get_list_nums_without_9([292069010, 73980, 8980155, 921545108, 75841309, 6899644]))
print("4.", get_list_nums_without_9([]))
nums = [292069010, 73980, 8980155, 21545108, 7584130, 688644, 644908219, 44281, 3259, 8527361, 2816279, 985462264, 904259, 3869, 609436333, 36915, 83705, 405576, 4333000, 79386997]
print("5.", get_list_nums_without_9(nums))
I'm trying to get number list without 9. If the list is empty or if all of the numbers in the list contain the digit 9, the function should return an empty list. I tried the function below, it doesn't work.
def get_list_nums_without_9(a_list):
j=0
for i in a_list:
a_list[j]=i.rstrip(9)
j+=1
return a_list
expected:
1. [677017, 48731548]
2. [6162, 5485406, 422862350, 74452, 480506, 2881]
3. []
4. []
5. [21545108, 7584130, 688644, 44281, 8527361, 83705, 405576, 4333000]

Answer 1

your lists contain integers. To remove the ones containing 9 the best way is to test if 9 belongs to the number as string and rebuild the output using a list comprehension with a conditional.
(Besides, rstrip removes the trailing chars of a string. Not suitable at all for your problem)
def get_list_nums_without_9(a_list):
return [x for x in a_list if "9" not in str(x)]
testing with your data:
>>> numbers = [
... [589775, 677017, 34439, 48731548, 782295632, 181967909],
... [6162, 29657355, 5485406, 422862350, 74452, 480506, 2881],
... [292069010, 73980, 8980155, 921545108, 75841309, 6899644],
... [],
... [292069010, 73980, 8980155, 21545108, 7584130, 688644, 644908219,
... 44281, 3259, 8527361, 2816279, 985462264, 904259, 3869, 609436333,
... 36915, 83705, 405576, 4333000, 79386997]
... ]
>>> for i, l in enumerate(numbers, 1):
... print("{}. {}".format(i, get_list_nums_without_9(l)))
1. [677017, 48731548]
2. [6162, 5485406, 422862350, 74452, 480506, 2881]
3. []
4. []
5. [21545108, 7584130, 688644, 44281, 8527361, 83705, 405576, 4333000]

Answer 2

You don't want to replace anything in the list, you want to generate a new list based on what you detect in the old list:
def get_list_nums_without_9(numbers):
sans_9 = []
for number in numbers:
if '9' not in str(number):
sans_9.append(number)
return sans_9
This will get you an empty list if there are no valid numbers.