Turn a single number into single digits Python

Question

I want to make a number   for example 43365644 into single numbers  4 3 3     4 4   and append it on a list

User · Answer

The easiest way is to turn the int into a string and take each character of the string as an element of your list:

>>> n = 43365644 
>>> digits = [int(x) for x in str(n)]
>>> digits
[4, 3, 3, 6, 5, 6, 4, 4]
>>> lst.extend(digits)  # use the extends method if you want to add the list to another

It involves a casting operation, but it's readable and acceptable if you don't need extreme performance.

User · Answer

This can be done quite easily if you    Use str to convert the number into a string so that you can iterate over it  Use a list comprehension to split the string into individual digits  Use int to convert the digits back into integers    Below is a demonstration    gt  gt  gt  n   43365644  gt  gt  gt   int d  for d in str n    4  3  3  6  5  6  4  4   gt  gt  gt

User · Answer

Here s a way to do it without turning it into a string first  based on some rudimentary benchmarking  this is about twice as fast as stringifying n first    gt  gt  gt  n   43365644  gt  gt  gt    n   10  i   10 for i in range math ceil math log n  10  -1  -1  -1    4  3  3  6  5  6  4  4   Updating this after many years in response to comments of this not working for powers of 10    n   10  i   10 for i in range math ceil math log n  10    -1  -1   bool math log n 10  1     The issue is that with powers of 10  and ONLY with these   an extra step is required  ---So we use the remainder in the log 10 to determine whether to remove the leading 0--- We can t exactly use this because floating-point math errors cause this to fail for some powers of 10  So I ve decided to cross the unholy river into sin and call upon regex  In  32   n   43  In  33     n   10  i   10 for i in range math ceil math log n  10    -1  -1   not re match  10    str n      Out 33    4  3   In  34   n   1000  In  35     n   10  i   10 for i in range math ceil math log n  10    -1  -1   not re match  10    str n      Out 35    1  0  0  0

User · Answer

If you want to change your number into a list of those numbers  I would first cast it to a string  then casting it to a list will naturally break on each character    int x  for x in str n

[python] Turn a single number into single digits Python

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