Python 尝试执行子流程调用时，没有此类文件或目录

前言：我知道以前有人问过这个问题，但我无法从前面的答案中找到解决错误的方法

我只想调用

diff

，在同一个文件上输出两个不同的命令

 import os, sys
 from subprocess import check_call
 import shlex

 ourCompiler = 'espressoc';
 checkCompiler = 'espressocr';

 indir = 'Tests/Espresso/GoodTests';

 check_call(["pwd"]);

 for root, dirs, filenames in os.walk(indir):
     for f in filenames:
         if len(sys.argv) == 2 and sys.argv[1] == f:
             str1 = "<(./%s ./%s) " % (ourCompiler, os.path.join(root, f))
             str2 = "<(./%s ./%s) " % (checkCompiler, os.path.join(root, f))
             check_call(["diff", str1, str2])

导入操作系统，系统 从子流程导入检查调用 导入shlex 我们的编译器=‘浓缩咖啡’； checkCompiler='espressocr'； indir=‘测试/浓缩咖啡/好的测试’； 检查呼叫（[“pwd”]）； 对于os.walk（indir）中的根目录、目录和文件名： 对于文件名中的f： 如果len（sys.argv）==2和sys.argv[1]==f：

---

str1=“

diff

正在抱怨找不到具有奇怪名称的文件

diff: <(./espressoc ./Tests/Espresso/GoodTests/Init.java) : No such file or directory
diff: <(./espressocr ./Tests/Espresso/GoodTests/Init.java) : No such file or directory
Traceback (most recent call last):
  File "runTest.py", line 21, in <module>
    check_call(["diff", str1, str2])
  File "/usr/lib/python3.5/subprocess.py", line 581, in check_call
    raise CalledProcessError(retcode, cmd)
subprocess.CalledProcessError: Command '['diff', '<(./espressoc ./Tests/Espresso/GoodTests/Init.java) ', '<(./espressocr ./Tests/Espresso/GoodTests/Init.java) ']' returned non-zero exit status 2

subprocess.check_call(['diff', '<this', '<that'])` # strange files.
subprocess.check_call('diff <this <that', shell=True)` # /bin/sh does some redirection