⚠️ 语法站放行，语义站拦下

在函数外面写一句 return 1。让语法站（ast.parse）和语义站（compile）各判一次：

import ast, io, tokenize

def stage_of(src):
    """这段源码在流水线的哪一站被拦下来"""
    try:
        list(tokenize.generate_tokens(io.StringIO(src).readline))
    except (tokenize.TokenError, IndentationError, SyntaxError):
        return "词法"
    try:
        ast.parse(src)
    except SyntaxError:
        return "语法"
    try:
        code = compile(src, "<s>", "exec")
    except SyntaxError:
        return "语义"
    try:
        exec(code, {})
    except NameError:
        return "运行"
    return "通过"

import ast
SEM = 'return 1'

ok_parse = "过" if ast.parse(SEM) else "过"
try:
    compile(SEM, "<s>", "exec")
    ok_compile = "过"
except SyntaxError:
    ok_compile = "不过"

print(ok_parse + "/" + ok_compile)