shell 子进程命令显示文件未找到错误：[Errno 2]没有此类文件或目录

wwtsj6pe 于 2023-03-19 发布在 Shell

关注(0)|答案(3)|浏览(183)

我试图通过使用下面代码中的subprocess模块来运行python shell命令，但是我不知道为什么我的脚本会抛出下面这样的错误。有人能帮助我吗？

Traceback (most recent call last):
  File "/Scripts/test_file.py", line 6, in <module>
    p2 = subprocess.Popen('sed s\'/&quot;/ /g\'', stdin=p1.stdout, stdout=subprocess.PIPE)
  File "/Library/Developer/CommandLineTools/Library/Frameworks/Python3.framework/Versions/3.8/lib/python3.8/subprocess.py", line 854, in __init__
    self._execute_child(args, executable, preexec_fn, close_fds,
  File "/Library/Developer/CommandLineTools/Library/Frameworks/Python3.framework/Versions/3.8/lib/python3.8/subprocess.py", line 1702, in _execute_child
    raise child_exception_type(errno_num, err_msg, err_filename)
FileNotFoundError: [Errno 2] No such file or directory: "sed s'/&quot;/ /g'"`

import subprocess
#output3.txt='/Users/boggulv/Desktop/output3.txt'
p1 = subprocess.Popen( ['cat', 'output3.txt'], stdout=subprocess.PIPE)
print(p1)
p2 = subprocess.Popen('sed s\'/&quot;/ /g\'', stdin=p1.stdout, stdout=subprocess.PIPE)
p3 = subprocess.Popen('grep "sO"', stdin=p2.stdout,stdout=subprocess.PIPE)
p4 = subprocess.Popen('grep -v "get"', stdin=p3.stdout, stdout=subprocess.PIPE)
p5 = subprocess.Popen('cut -d \',\' -f2', stdin=p4.stdout, stdout=subprocess.PIPE)
p6 = subprocess.Popen('sed \'s/"//g\'', stdin=p5.stdout, stdout=subprocess.PIPE)
p7 = subprocess.Popen('sort', stdin=p6.stdout, stdout=subprocess.PIPE)
p8 = subprocess.Popen('sort', stdin=p8.stdout, stdout=subprocess.PIPE)
p9 = subprocess.Popen('uniq -c', stdin=p8.stdout, stdout=subprocess.PIPE)
p0 = subprocess.Popen('sort -nr', stdin=p9.stdout, stdout=subprocess.PIPE)
print(p01.communicate())

已尝试更改为列表。

p2 = subprocess.Popen('sed \'s/&quot;/ /g\'', stdin=p1.stdout, stdout=subprocess.PIPE, shell=True)
p3 = subprocess.Popen(['grep','"shipOption"'], stdin=p2.stdout,stdout=subprocess.PIPE,shell = True)
p4 = subprocess.Popen(['grep','-v', '"getShipMethod"'], stdin=p3.stdout, stdout=subprocess.PIPE,shell = True)
p5 = subprocess.Popen(['cut','-d','\',\'', '-f2'], stdin=p4.stdout, stdout=subprocess.PIPE,shell = True)
p6 = subprocess.Popen(['sed','\'s/"//g\''],stdin=p5.stdout, stdout=subprocess.PIPE,shell = True)
p7 = subprocess.Popen(['sort'], stdin=p6.stdout, stdout=subprocess.PIPE,shell = True)
p8 = subprocess.Popen(['uniq', '-c'], stdin=p7.stdout, stdout=subprocess.PIPE,shell = True)
p9 = subprocess.Popen(['sort', '-nr'], stdin=p8.stdout, stdout=subprocess.PIPE,shell = True)
p0 = subprocess.Popen(['head', '-10'], stdin=p9.stdout, stdout=subprocess.PIPE,shell = True)```

New Error:

`usage: grep [-abcdDEFGHhIiJLlMmnOopqRSsUVvwXxZz] [-A num] [-B num] [-C[num]]
        [-e pattern] [-f file] [--binary-files=value] [--color=when]
        [--context[=num]] [--directories=action] [--label] [--line-buffered]
        [--null] [pattern] [file ...]
usage: grep [-abcdDEFGHhIiJLlMmnOopqRSsUVvwXxZz] [-A num] [-B num] [-C[num]]
        [-e pattern] [-f file] [--binary-files=value] [--color=when]
        [--context[=num]] [--directories=action] [--label] [--line-buffered]
        [--null] [pattern] [file ...]
usage: cut -b list [-n] [file ...]
       cut -c list [file ...]
       cut -f list [-s] [-w | -d delim] [file ...]
(b'', None)
cat: stdin: Input/output error`

shell

来源：https://stackoverflow.com/questions/70160450/subprocess-command-shows-filenotfounderror-errno-2-no-such-file-or-directory

3条答案

按热度按时间

wwwo4jvm1#

你的命令仍然是错误的。如果你只是想像shell那样运行这些命令，绝对最简单的方法是...使用shell。

result = subprocess.run('''
# useless cat, but bear with
cat output3.txt |
sed 's/&quot;/ /g' |
grep "shipOption" |
grep -v "getShipMethod" |
cut -d ',' -f2 |
sed 's/"//g' |
sort |
uniq -c |
sort -nr |
head -10
    ''',
    # Probably add these too
    check=True,
    capture_output=True,
    # We are using the shell for piping etc
    shell=True)

如果您想删除shell=True并手动运行所有这些进程，您必须了解shell的工作原理，特别是，您需要修改引号，以便您运行的命令在shell处理完语法引号后 * 仍保留引号。

p1 = subprocess.Popen(['cat', 'output3.txt'], stdout=subprocess.PIPE)  # still useless
p2 = subprocess.Popen(['sed','s/&quot;/ /g'], stdin=p1.stdout, stdout=subprocess.PIPE)
p3 = subprocess.Popen(['grep', "shipOption"], stdin=p2.stdout,stdout=subprocess.PIPE)
p4 = subprocess.Popen(['grep', '-v', "getShipMethod"], stdin=p3.stdout, stdout=subprocess.PIPE)
p5 = subprocess.Popen(['cut', '-d', ',', '-f2'], stdin=p4.stdout, stdout=subprocess.PIPE)
p6 = subprocess.Popen(['sed', 's/"//g'],stdin=p5.stdout, stdout=subprocess.PIPE)
p7 = subprocess.Popen(['sort'], stdin=p6.stdout, stdout=subprocess.PIPE)
p8 = subprocess.Popen(['uniq', '-c'], stdin=p7.stdout, stdout=subprocess.PIPE)
p9 = subprocess.Popen(['sort', '-nr'], stdin=p8.stdout, stdout=subprocess.PIPE)
p0 = subprocess.Popen(['head', '-10'], stdin=p9.stdout, stdout=subprocess.PIPE)

请特别注意sed和grep的参数是如何去掉它们的外引号的，以及我们是如何在所有地方都去掉shell=True的。（或其他subprocess方法）是一个列表，则不应使用shell=True，反之亦然。（有些情况下，您可以将列表传递给shell=True，但是......我们甚至还没有开始讨论这个问题。）
不过，所有这些似乎都没有实际意义，因为Python可以出色地完成所有这些事情。

from collections import Counter

counts = Counter()
with open('output3.txt', 'r', encoding='utf-8') as lines:
    for line in lines:
        line = line.rstrip('\n').replace('&quot;', ' ')
        if "shipOption" in line and "getShipMethod" not in line:
            field = line.split(',')[1].replace('"', '')
            counts[field] += 1
print(counts.most_common(10))

也许您希望将rstrip和replace放在if中以避免不必要的工作，当然，可以对shell管道进行相同的重构。

赞(0）回复(0）举报 2023-03-19

brgchamk2#

根据Gordon上面的描述-默认情况下，Popen（）处理

sed 's/&quot;/ /g'

作为要运行的命令的名称，而不是命令名加一个参数。因此，您需要执行以下操作之一：

p2 = subprocess.Popen(['sed', 's/&quot;/ /g'], stdin=p1.stdout, stdout=subprocess.PIPE)

或

p2 = subprocess.Popen('sed \'s/&quot;/ /g\'', stdin=p1.stdout, stdout=subprocess.PIPE, shell=True)

使用shell=True可以让Popen函数将字符串拆分为包含命令和参数的列表。
还要注意，p0是最后一个结果，但您调用了p01.communicate（）

赞(0）回复(0）举报 2023-03-19

neekobn83#

假设您使用命令'pythonhello.py--main'来运行hello.py文件，并将--main作为参数。
这将抛出一个错误，即没有找到这样的文件或目录。

subprocess.run(["python", "hello.py --main"],stdout=subprocess.PIPE)

在子流程中，您可以将其编写为

subprocess.run(["python", "hello.py", "--main"],stdout=subprocess.PIPE)

您可以将其放入变量中，并按如下所示打印从脚本返回的值

data = subprocess.run(["python", "hello.py", "--main"],stdout=subprocess.PIPE)

print(data.stdout.decode('utf-8').strip())

赞(0）回复(0）举报 2023-03-19

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shell 子进程命令显示文件未找到错误：[Errno 2]没有此类文件或目录

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