检测可执行文件是否在用户的PATH上

import os

def is_executable_in_path(executable):
    for path in os.environ["PATH"].split(os.pathsep):
        path = path.strip('"')
        exe_file = os.path.join(path, executable)
        if os.path.isfile(exe_file) and os.access(exe_file, os.X_OK):
            return True
    return False

executable = "python"
if is_executable_in_path(executable):
    print(f"{executable} is in PATH")
else:
    print(f"{executable} is not in PATH")