Using impacker

CKP is compatible with impacker, a tool for packing a code and its dependencies into one file. Therefore, CKP can be used for online judges which cannot accept more than one source file.

Instruction

Assume that you’ve written a program using CKP like this.

from ckp.number_theory.primality_test import is_prime_trial_division

N = int(input())
print(is_prime_trial_division(N))

First, install impacker.

# Using Poetry
poetry add git+https://github.com/123jimin/impacker.git

Then, run impacker (assuming that the source file is code.py, and you wish the result file’s name to be out.py):

poetry run python -m impacker code.py out.py

out.py will contain the packed source code, submittable to online judges:

from math import isqrt

# is_prime_trial_division | from primality_test.py, line 3
def is_prime_trial_division(n: int) -> bool:
    """ Primality testing using trial division. Slow but good enough for simple problems. """
    if n < 53:
        return n in {2, 3, 5, 7, 11, 13, 17, 19, 23, 29, 31, 37, 41, 43, 47}
    if not (n & 1 and n % 3 and n % 5 and n % 7 and n % 11 and n % 13):
        return False
    if n < 289:
        return True
    for p in range(17, isqrt(n) + 1, 6):
        if not (n % p and n % (p + 2)):
            return False
    return True

# From main code
N = int(input())
print(is_prime_trial_division(N))

Try running the following for available arguments:

poetry run python -m impacker -h

Caveats

impacker is not a perfect solution, and there are many issues with it.

• impacker doesn’t support global variables in imported modules.
  • Hence, CKP does not make use of any global variables.
  • Using global variables on main code file is fine.
• impacker may pack unused import statements.
  • If you don’t care about unused code, then this issue can be ignored.
• If a class is being used, then impacker will pack all parts of the class.
  • Consider using imperative API over object-oriented API.
  • Again, if you don’t care about unused code, then this issue can be ignored.