Python 属性错误：'；str'；对象没有属性'；文件编号'；

代码：

错误：

import subprocess

def printit():
    for i in range(6):
        for j in range(6):
            query = "select rxpkts, txpkts from ./log.csv where datapath = "+str(i)+" and port = "+str(j)
            fileName = str(i)+"_"+str(j)+".csv"
            with open(fileName, "w+"):
                p = subprocess.Popen(["python", "q", "-H", "-d", ",", query], stdout=fileName)

printit()

$python processLog.py
回溯（最近一次呼叫最后一次）：
文件“processLog.py”，第11行，在
printit（）
文件“processLog.py”，第9行，在printit中
p=subprocess.Popen（[“python”、“q”、“-H”、“-d”、“，”，query]，stdout=fileName）
文件“/usr/lib/python2.7/subprocess.py”，第702行，在__
errread，errwrite），to_close=self._get_句柄（stdin，stdout，stderr）
文件“/usr/lib/python2.7/subprocess.py”，第1128行，在获取句柄中
c2pwrite=stdout.fileno（）
AttributeError:“str”对象没有属性“fileno”

---

可能是什么问题？我正在使用参数

stdout

需要一个file对象，而不是文件名的字符串

试用-

$ python processLog.py 
Traceback (most recent call last):
  File "processLog.py", line 11, in <module>
    printit()
  File "processLog.py", line 9, in printit
    p = subprocess.Popen(["python", "q", "-H", "-d", ",", query], stdout=fileName)
  File "/usr/lib/python2.7/subprocess.py", line 702, in __init__
    errread, errwrite), to_close = self._get_handles(stdin, stdout, stderr)
  File "/usr/lib/python2.7/subprocess.py", line 1128, in _get_handles
    c2pwrite = stdout.fileno()
AttributeError: 'str' object has no attribute 'fileno'

---

请注意，StringIO虽然属于适当的子类，但不会工作。有关更多信息，请参阅。

import subprocess

def printit():
    for i in range(6):
        for j in range(6):
            query = "select rxpkts, txpkts from ./log.csv where datapath = "+str(i)+" and port = "+str(j)
            fileName = str(i)+"_"+str(j)+".csv"
            with open(fileName, "w+") as f:
                p = subprocess.Popen(["python", "q", "-H", "-d", ",", query], stdout=f)

printit()