在 Python 中，如何测试解释器是否正在运行 Pyston、Jython、CPython?

Question

我想从正在运行的Python程序内部测试解释器是否正在运行pyston，jython，ironpython，pypy等。

我想到的事情是system.version上的模式匹配和检查imp.get_magic()的幻数 但这两个似乎都有点脆弱和笨拙。还有其他建议吗？

编辑： user2357112再次通过。

我尝试在我安装的每个Python版本上运行以下代码，这区分了Jython，Pyston和各种CPythons。它在 Python 2.6 之前的位置是 python，以及 CPython 的 anaconda 变体。对于蟒蛇来说，这可能是正确的事情。

这是程序和结果。随意注意这适用于或不适用于哪些其他类型的 Python。

import platform
print(platform.python_implementation())

和外壳脚本：

for v in $(pyenv versions); do # not quite right
pyenv local $v
echo "version is $v"
python /tmp/foo.py
echo "==================="
done

我得到了这个输出：

===================
version is 2.1.3
Traceback (most recent call last):
File "/tmp/foo.py", line 1, in ?
import platform
ImportError: No module named platform
===================
version is 2.2.3
Traceback (most recent call last):
File "/tmp/foo.py", line 1, in ?
import platform
ImportError: No module named platform
===================
version is 2.3.7
Traceback (most recent call last):
File "/tmp/foo.py", line 2, in ?
print(platform.python_implementation())
AttributeError: 'module' object has no attribute 'python_implementation'
===================
version is 2.4.6
Traceback (most recent call last):
File "/tmp/foo.py", line 2, in ?
print(platform.python_implementation())
AttributeError: 'module' object has no attribute 'python_implementation'
===================
version is 2.5.6
Traceback (most recent call last):
File "/tmp/foo.py", line 2, in <module>
print(platform.python_implementation())
AttributeError: 'module' object has no attribute 'python_implementation'
===================
version is 2.6.9
CPython
===================
version is 2.7.12
CPython
===================
version is 2.7.13
CPython
===================
version is 2.7.8
CPython
===================
version is 3.0.1
CPython
===================
version is 3.1.5
CPython
===================
version is 3.2.6
CPython
===================
version is 3.3.5
CPython
===================
version is 3.3.6
CPython
===================
version is 3.4.2
CPython
===================
version is 3.5.0
CPython
===================
version is 3.5.1
CPython
===================
version is 3.5.2
CPython
===================
version is 3.6.0
CPython
===================
version is 3.6.0a4
CPython
===================
version is 3.6.0b2
CPython
===================
version is 3.6.1
CPython
===================
version is 3.6.2
CPython
===================
version is 3.7-dev
CPython
===================
version is anaconda2-4.1.1
CPython
===================
version is anaconda3-4.1.0
CPython
===================
version is jython-2.7.1b3
Jython
===================
version is pypy2-5.4.1
PyPy
===================
version is pypy2-5.6.0
PyPy
===================
version is pypy-2.6.1
PyPy
===================
version is pypy3-2.3.1
PyPy
===================
version is pypy3-2.4.0
PyPy
===================
version is pypy3.5-5.8.0
PyPy
===================
version is pypy-5.0.1
PyPy
===================
version is pypy-5.3.1
PyPy
===================
version is pyston-0.6.0
Pyston
===================
version is pyston-0.6.1
Pyston
===================

Answer 1

正如user2357112所提到的，你可以检查platform.python_implementation() == "Pyston"，正如你在源代码中看到的那样。

Answer 2

在 Pyston 2.2 中，platform.python_implementation()不起作用。这是我在lib/pyston3.8/platform.py中看到的：

def python_implementation():
""" Returns a string identifying the Python implementation.
Currently, the following implementations are identified:
'CPython' (C implementation of Python),
'IronPython' (.NET implementation of Python),
'Jython' (Java implementation of Python),
'PyPy' (Python implementation of Python).
"""
return _sys_version()[0]

因此，相反，回退到接受答案中引用的来源背后的代码将起作用：

import sys
"Pyston" in sys.version

我在这里为此提出了一个问题。