Python3——对象路径……坏了？

Question

在尝试在 Python3 脚本中使用 objectpath 失败数小时后，我做了以下简单的实验：

>>> from objectpath import *
>>> tree=Tree({"a":1})
>>> tree.execute("$.a")

预期输出：1

用python成功（二）

~$ python
Python 2.7.15rc1 (default, Nov 12 2018, 14:31:15)
[GCC 7.3.0] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> from objectpath import *
>>> tree=Tree({"a":1})
>>> tree.execute("$.a")
1
>>>

python3 出错：

我的 Python3 安装有问题吗？ P3 中的 objectpath 既不适用于脚本也不适用于控制台

$ python3
Python 3.6.7 (default, Oct 22 2018, 11:32:17)
[GCC 8.2.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> from objectpath import *
>>> tree=Tree({"a":1})
>>> tree.execute("$.a")
Traceback (most recent call last):
File "/home/lisa/.local/lib/python3.6/site- 
packages/objectpath/core/parser.py", line 398, in tokenize_python
 yield type_map[t[0]], t[1]
KeyError: 4

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/home/lisa/.local/lib/python3.6/site- 
packages/objectpath/core/interpreter.py", line 605, in execute
tree=self.compile(expr)
File "/home/lisa/.local/lib/python3.6/site- 
packages/objectpath/core/interpreter.py", line 38, in compile
ret=EXPR_CACHE[expr]=parse(expr,self.D)
File "/home/lisa/.local/lib/python3.6/site- 
packages/objectpath/core/parser.py", line 464, in parse
r=expression().getTree()
File "/home/lisa/.local/lib/python3.6/site- 
packages/objectpath/core/parser.py", line 449, in expression
left=t.led(left)
File "/home/lisa/.local/lib/python3.6/site- 
 packages/objectpath/core/parser.py", line 264, in led
advance()
File "/home/lisa/.local/lib/python3.6/site- 
packages/objectpath/core/parser.py", line 161, in advance
token=nextToken()
File "/home/lisa/.local/lib/python3.6/site- 
packages/objectpath/core/parser.py", line 413, in tokenize
for ID, value in source:
File "/home/lisa/.local/lib/python3.6/site- 
packages/objectpath/core/parser.py", line 405, in tokenize_python
raise SyntaxError("Syntax error")

Answer 1

要在 Python 3.x 中运行它，你应该 pip3 install objectpath 否则它将无法工作。

请看下面我是如何运行你的代码的：

dell@dell-XPS-15-9572:~/Desktop$ pip3 install objectpath
Collecting objectpath
Downloading https://files.pythonhosted.org/packages/21/6a/ed435be72edd1d60b7363cbb38c34aff3004fee02d1c7f9f01435c318cdb/objectpath-0.5-py2.py3-none-any.whl
Installing collected packages: objectpath
Successfully installed objectpath-0.5
dell@dell-XPS-15-9572:~/Desktop$ python3
Python 3.6.5 (default, Apr  1 2018, 05:46:30) 
[GCC 7.3.0] on linux
Type "help", "copyright", "credits" or "license" for more 
information.
>>> from objectpath import *
>>> tree=Tree({"a":1})
>>> tree.execute("$.a")
1
>>>