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Idiom #308 Integer to string in base b

Create the string representation s of the integer value n in base b.

18 in base 3 -> "200"
26 in base 5 -> "101"
121 in base 12 -> "a1"

from string import digits, ascii_letters
a, s = digits + ascii_letters, ''
while n:
    s = a[n % b] + s
    n = n // b

Value n must be > 0.
import numpy
s = numpy.base_repr(n, b)

Valid range for b is 2-36.
def int_to_base_str(n, b):
    digits = '0123456789abcdefghijklmnopqrstuvwxyz'
    s = ''
    if n == 0: return '0'
    while n:
        n, remainder = divmod(n, b)
        s = digits[remainder] + s
    return s

Works for positive n and for b up to 36.
from string import printable
a, s = printable.rstrip(), ''
while n:
    s = a[n % b] + s
    n = n // b
let s = n.toString(b);

import "strconv"
s := strconv.FormatInt(int64(n), b)
New implementation...
< > ⌨
lesmana 
a, s = digits + ascii_letters, ''
while n:
    s = a[n % b] + s
    n = n // b
s = numpy.base_repr(n, b)
def int_to_base_str(n, b):
    digits = '0123456789abcdefghijklmnopqrstuvwxyz'
    s = ''
    if n == 0: return '0'
    while n:
        n, remainder = divmod(n, b)
        s = digits[remainder] + s
    return s
a, s = printable.rstrip(), ''
while n:
    s = a[n % b] + s
    n = n // b
let s = n.toString(b);

s := strconv.FormatInt(int64(n), b)
String s = Integer.toString(n, b);
function IntToBaseStr(n: longword; const b: cardinal): string;
const
  digits = '0123456789abcdefghijklmnopqrstuvwxyz';
var
  remainder: longword;
begin
  Result := '';
  repeat
    DivMod(n, b, n, remainder);
    result := digits[remainder + 1] + result;
  until n = 0;
end;
s := IntToStrBase(n,b);
sub int_to_base_str {
    my ($n, $b) = @_;
    my $digits = '0123456789abcdefghijklmnopqrstuvwxyz';
    my ($s, $q, $remainder) = ('');

    return '0' if $n == 0;

    use integer;

    while ($n) {
        ($n, $remainder) = ($n / $b, $n % $b), 
        $s = substr($digits, $remainder, 1) . $s;
    }

    return $s
}

s = n.to_s(b)
let s = radix(n, b);