Is it real Python? Which parts of Python can I use?

What works

• Statements: assignment (with += and the rest), if/elif/else, while, for i in range(…), break, continue, pass, def/return and global.
• Operators: + - * / // % **, chained comparisons like 0 < x < 10, and/or/not, x if c else y, and & | ^ ~ << >>.
• Built-ins: abs, min, max, int, round, len, True and False.
• Lists: fixed-size lists of numbers, made with [0] * n or a literal like [1, 2, 3]. You can index them (seen[i], seen[-1]), use len() and loop over them with for x in seen. A list never grows.
• Functions can call each other and themselves. A function can return lo, hi, and the caller unpacks it: a, b = f().
• Docstrings and type hints are accepted and ignored, so ordinary Python style compiles.

What's left out

Classes of your own, strings (except a log's text and docstrings), dicts, sets, tuples, slices, comprehensions, default and keyword arguments, exceptions, lambda, generators, with, None, print and any module other than bot.

Numbers

There is one number type, fixed point: from −32768 to about 32767.99998, in steps of 1/65536. Python's meanings are kept: 7 / 2 is 3.5, -7 // 2 is -4, -7 % 3 is 2, and round(2.5) is 2. Dividing by zero gives 0 instead of an error. True is 1 and False is 0.

An example

from bot import Chassis, Scanner, Laser, wait

chassis = Chassis(0)
scanner = Scanner(1)
laser = Laser(2)

seen = [0] * 4


def wrap(a: float) -> float:
    """An angle in -180..180."""
    while a >= 180:
        a -= 360
    while a < -180:
        a += 360
    return a


while True:
    for i in range(4):
        seen[i] = scanner.ping(i)
    if seen[0]:
        b = scanner.bearing(0)
        chassis.turn = wrap(b - chassis.heading) / 45
        if laser.ready:
            laser.fire(b)
    wait()

If you use something that isn't there

You get a compile error that says so, on the line where it happened. For example, print(1) gives the bot has no screen or files: print() isn't available, and a dict gives dicts and sets aren't part of this Python subset. Use log() to see values while your bot runs.

The full list is in Reference under the editor, in the Language section.