from subprocess import run
import sys
import time

with open("import_print_number.py", "w") as f:
    f.write(
        """\
from print_number import print_number 
print_number()
"""
    )

for i in range(20):
    print("test", i)
    with open("print_number.py", "w") as f:
        f.write(f"def print_number(): print({i})")

    # low numbers make the bug more likely
    time.sleep(0.6)

    # run the code
    result = run([sys.executable, "import_print_number.py"], capture_output=True)

    n = int(result.stdout.decode().strip())

    # numbers should be equal but are not in some cases,
    # because python uses some old cached bytecode
    assert i == n, (i, n)

test 0
test 1
test 2
Traceback (most recent call last):
  File "/home/frank/projects/pysource-playground/pysource-minimize/bug.py", line 28, in <module>
    assert i == n, (i, n)
           ^^^^^^
AssertionError: (2, 1)