import os
import shutil
import distutils.spawn
import subprocess

program = 'program'
with open(program, "w") as fp:
    print("#!/usr/bin/bash", file=fp)
    print('echo "execv() also runs the program"', file=fp)
    fp.flush()

os.chmod(program, 0o777)

os.environ['PATH'] = ''
print(f"get_exec_path: {os.get_exec_path()!r}")
print(f"shutil.which: {shutil.which(program)!r}")
print(f"distutils.spawn.find_executable: {distutils.spawn.find_executable(program)!r}")
proc = subprocess.run([program], stdout=subprocess.PIPE)
print("subprocess runs the program")

args = [program]
os.execv(args[0], args)