How to insert integers into a list without indexing using python?

Question

I am trying to insert values 0 - 9 into a list without indexing. For example if I have the list [4, 6, 'X', 9, 0, 1, 5, 7] I need to be able to insert the integers 0 - 9 into the placeholder 'X' and test it with a function I have already written. How would I go about doing this without using the insert() function or any other function that uses indexing?

So far I have been able to retrieve the position of 'X in the list using the code below:

unknown = list("46X90157")
known = []
position = 0
for item in unknown:
    known.append(item)
    if item == 'X':
        locked = 0
        locked = position
    position = position + 1

The desired output would be the same list repeated 10 times with the 10 different values (0-9) in place of 'X':

[4, 6, 0, 9, 0, 1, 5, 7], [4, 6, 1, 9, 0, 1, 5, 7], [4, 6, 2, 9, 0, 1, 5, 7], [4, 6, 3, 9, 0, 1, 5, 7], [4, 6, 4, 9, 0, 1, 5, 7], [4, 6, 5, 9, 0, 1, 5, 7], [4, 6, 6, 9, 0, 1, 5, 7], [4, 6, 6, 9, 0, 1, 5, 7], [4, 6, 7, 9, 0, 1, 5, 7], [4, 6, 8, 9, 0, 1, 5, 7], [4, 6, 9, 9, 0, 1, 5, 7]

[4, 6, 0, 9, 0, 1, 5, 7], [4, 6, 1, 9, 0, 1, 5, 7], [4, 6, 2, 9, 0, 1, 5, 7], [4, 6, 3, 9, 0, 1, 5, 7], [4, 6, 4, 9, 0, 1, 5, 7], [4, 6, 5, 9, 0, 1, 5, 7], [4, 6, 6, 9, 0, 1, 5, 7], [4, 6, 6, 9, 0, 1, 5, 7], [4, 6, 7, 9, 0, 1, 5, 7], [4, 6, 8, 9, 0, 1, 5, 7], [4, 6, 9, 9, 0, 1, 5, 7] — Ian
– Ian, Commented Oct 29, 2015 at 16:53
[[el if el=='X' else j for el in unknown] for j in range (10)] maybe — Pynchia
– Pynchia, Commented Oct 29, 2015 at 17:03
@Pynchia your if else is backwards but the idea works. [[j if el=='X' else el for el in unknown] for j in range (10)] — SirParselot
– SirParselot, Commented Oct 29, 2015 at 17:09

inspectorG4dget · Accepted Answer · 2015-10-29 16:56:03Z

4

unknown = list("46X90157")
unknown = ''.join(unknown)
for i in range(10):
    print([int(i) for i in unknown.replace("X", str(i))])

answered Oct 29, 2015 at 16:56

inspectorG4dget

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5 Comments

R Nar Over a year ago

whats the point of creating a list from the string if you are just going to join it back into a string right after...?

inspectorG4dget Over a year ago

@RNar: I was starting from OP's post

Ian Over a year ago

Thank you so much, this is perfect!

Ian Over a year ago

Last question though, would this be considered indexing?

inspectorG4dget Over a year ago

I am not indexing anything in there

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