我在 if 语句下写的语法错误

Question

我正在为此苦苦挣扎，也许是我看不到但很简单的事情...

import subprocess, pprint
cmd = subprocess.Popen('bhosts', shell=True, stdout=subprocess.PIPE)
errorCode = 0
description =""
arrayprova=[]
for linea in cmd.stdout:
    if "ok" not in linea and "closed" not in linea and "HOST_NAME" not in linea:
        arrayprova = linea.split()
        description = description + "host " + arrayprova[0] + "is " + arrayprova[1] 
        errorCode = 1
print arrayprova[1]
if errorCode == 0:
    description ="Everything is just fine."
print description

我收到这个错误：

  File "bhosts_nodes_check.py", line 9
    description = description + "host " + arrayprova[0] + "is " + arrayprova[1]
    ^
SyntaxError: invalid syntax

Answer 1

您在编辑器中混用了制表符和空格：

>>> '''\
...         arrayprova = linea.split()
...                 description = description + "host " + arrayprova[0] + "is " + arrayprova[1] 
... '''
'        arrayprova = linea.split()\n\t\tdescription = description + "host " + arrayprova[0] + "is " + arrayprova[1] \n'
>>> # ^^^ spaces here - but tabs here ^^^^
...

Python 将制表符扩展到每 8 列，但您可能将编辑器设置为仅对制表符使用 4 个空格，这进一步增加了混乱。您的 arrayprova 行缩进为 8 个空格，而下一行的两个制表符扩展为 16 个空格。

永远不要使用混合缩进样式；坚持只使用制表符或只使用空格。

您可以将大多数编辑器配置为仅使用空格进行缩进，其中按 TAB 键会导致写入空格。这是 Python styleguide (PEP 8) 推荐的内容：

Tabs or Spaces?

Never mix tabs and spaces.

The most popular way of indenting Python is with spaces only. The second-most popular way is with tabs only. Code indented with a mixture of tabs and spaces should be converted to using spaces exclusively. When invoking the Python command line interpreter with the -t option, it issues warnings about code that illegally mixes tabs and spaces. When using -tt these warnings become errors. These options are highly recommended!

For new projects, spaces-only are strongly recommended over tabs. Most editors have features that make this easy to do.

我在 if 语句下写的语法错误

Syntax error whatever I write under an if statement

python

arrays

syntax

split

list

Tabs or Spaces?