Python Base36 integer to string

b36.py

def b36(number: int) -> str:
    """
    Converts an integer to its string representation in base 36
    (using 0-9 and a-z).
    """
    if number == 0:
        return "0"

    # Define the alphabet for base 36: 0-9 followed by a-z
    alphabet = "0123456789abcdefghijklmnopqrstuvwxyz"
    
    # Handle negative numbers
    is_negative = number < 0
    number = abs(number)
    
    base36_chars = []
    
    while number > 0:
        number, remainder = divmod(number, 36)
        base36_chars.append(alphabet[remainder])
    
    if is_negative:
        base36_chars.append('-')
    
    # The algorithm produces digits in reverse order, so we reverse them back
    return ''.join(reversed(base36_chars))

# --- Usage Examples ---
if __name__ == "__main__":
    print(f"0 -> {b36(0)}")           # Output: 0
    print(f"10 -> {b36(10)}")         # Output: a
    print(f"35 -> {b36(35)}")         # Output: z
    print(f"36 -> {b36(36)}")         # Output: 10
    print(f"71 -> {b36(71)}")         # Output: 1z
    print(f"-1234 -> {b36(-1234)}")   # Output: -yuje
    print(f"Large -> {b36(123456789)}") # Output: 21i3v9