PyDev/Python3.1 子进程错误 - 未声明编码

Question

当我运行 Parent.py 调用子进程 child.exe 时，会发生以下错误

  File "child.exe", line 1
SyntaxError: Non-UTF-8 code starting with '\x90' in file child.exe on line 1, but no encoding declared; see http://python.org/dev/peps/pep-0263/ for details

如果我使用 child.py 运行 Parent.py，则执行成功返回 'Hello from家长。来自日食。

如果我从附带的 IDLE 运行 Parent.py，则在 child.exe 和 child.py 的情况下都不会返回任何内容

我已阅读http://python.org/dev/peps/pep-0263 / 文档并理解它，可能误解它意味着我应该添加我尝试添加到 child.exe 中的建议注释......它们不起作用。

Parent.py

import os
import subprocess
import sys

if sys.platform == "win32":
    import msvcrt
    import _subprocess
else:
    import fcntl

# Create pipe for communication
pipeout, pipein = os.pipe()

# Prepare to pass to child process
if sys.platform == "win32":
    curproc = _subprocess.GetCurrentProcess()
    pipeouth = msvcrt.get_osfhandle(pipeout)
    pipeoutih = _subprocess.DuplicateHandle(curproc, pipeouth, curproc, 0, 1,
            _subprocess.DUPLICATE_SAME_ACCESS)

    pipearg = str(int(pipeoutih))  
else:
    pipearg = str(pipeout)

    # Must close pipe input if child will block waiting for end
    # Can also be closed in a preexec_fn passed to subprocess.Popen
    fcntl.fcntl(pipein, fcntl.F_SETFD, fcntl.FD_CLOEXEC)

# Start child with argument indicating which FD/FH to read from
subproc = subprocess.Popen(['python', 'child.exe', pipearg], close_fds=False)

# Close read end of pipe in parent
os.close(pipeout)
if sys.platform == "win32":
    pipeoutih.Close()

# Write to child (could be done with os.write, without os.fdopen)
pipefh = os.fdopen(pipein, 'w')
pipefh.write("Hello from parent.")
pipefh.close()

# Wait for the child to finish
subproc.wait()

Child.exe（使用 cx_freeze 冻结）

import os, sys


if sys.platform == "win32":
    import msvcrt

# Get file descriptor from argument
pipearg = int(sys.argv[1])
if sys.platform == "win32":
    pipeoutfd = msvcrt.open_osfhandle(pipearg, 0)
else:
    pipeoutfd = pipearg

# Read from pipe
# Note:  Could be done with os.read/os.close directly, instead of os.fdopen
pipeout = os.fdopen(pipeoutfd, 'r')
print(pipeout.read())
pipeout.close()

Answer 1

subprocess.Popen(['python', 'child.exe', pipearg], ...

问题是，如果 child.exe 是普通的 Windows 可执行文件，那么您正试图让 python 读取二进制文件。出现此错误是因为二进制文件的字节不符合标准 ascii - utf8 标准，因此解释器无法读取它。

也许您想要的只是执行 child.exe，然后从中删除 python 行：

subprocess.Popen(['child.exe', pipearg], ...