相关疑难解决方法(0)

我试图使用Python函数计算文件中的行数.在当前目录中,当os.system("ls")找到文件时,命令subprocess.Popen(["wc -l filename"], stdout=subprocess.PIPE)不起作用.

这是我的代码:

>>> import os
>>> import subprocess
>>> os.system("ls")
sorted_list.dat
0
>>> p = subprocess.Popen(["wc -l sorted_list.dat"], stdout=subprocess.PIPE)File "<stdin>", line 1, in <module>
File "/Users/a200/anaconda/lib/python2.7/subprocess.py", line 710, in __init__
    errread, errwrite)
File "/Users/a200/anaconda/lib/python2.7/subprocess.py", line 1335, in _execute_child
    raise child_exception
OSError: [Errno 2] No such file or directory