Python3读取.pyc文件

demo.py

x = 123


def hello():
    t = (1,2)


class User: pass

run.py

import sys
import demo
import types
import marshal
import dis


def show_code(code, indent=''):
    print(f"{indent}code")
    indent += '   '
    print(f"{indent}argcount {code.co_argcount}")
    print(f"{indent}nlocals {code.co_nlocals}")
    print(f"{indent}stacksize {code.co_stacksize}")
    print(f"{indent}flags {code.co_flags:04x}")
    dis.disassemble(code)
    print(f"{indent}consts")
    for const in code.co_consts:
        if isinstance(const, types.CodeType):
            show_code(const, indent + '   ')
        else:
            print(f"   {indent}{const}")
    print(f"{indent}names {code.co_names}")
    print(f"{indent}varnames {code.co_varnames}")
    print(f"{indent}freevars {code.co_freevars}")
    print(f"{indent}cellvars {code.co_cellvars}")
    print(f"{indent}filename {code.co_filename}")
    print(f"{indent}name {code.co_name}")
    print(f"{indent}firstlineno {code.co_firstlineno}")


def show_file():
    header_sizes = [(8, (0, 9, 2)), (12, (3, 6)), (16, (3, 7))]
    header_size = next(s for s, v in reversed(header_sizes) if sys.version_info >= v)

    print(isinstance(demo, types.ModuleType))
    with open(demo.__cached__, "rb") as f:
        metadata = f.read(header_size)
        code = marshal.load(f)
        print(code)
        show_code(code)


if __name__ == '__main__':
    show_file()