Inconsistency with sys.version_info

[omus]

In Python 3.7.2:

Python 3.7.2 (default, Feb 12 2019, 08:16:38)
[Clang 10.0.0 (clang-1000.11.45.5)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import sys
>>> sys.version_info
sys.version_info(major=3, minor=7, micro=2, releaselevel='final', serial=0)
>>> sys.version_info.major
3
>>> sys.version_info[0]
3

Using PyCall 1.90.0:

julia> using PyCall

julia> sys = pyimport("sys")
PyObject <module 'sys' (built-in)>

julia> sys.version_info
(3, 7, 2, "final", 0)

julia> sys.version_info.major
ERROR: type Tuple has no field major
Stacktrace:
 [1] getproperty(::Any, ::Symbol) at ./sysimg.jl:18

julia> sys.version_info[1]
3

Things get stranger when switching to Python 2:

Python 2.7.16 (default, Mar  4 2019, 09:02:22)
[GCC 4.2.1 Compatible Apple LLVM 10.0.0 (clang-1000.11.45.5)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> import sys
>>> sys.version_info
sys.version_info(major=2, minor=7, micro=16, releaselevel='final', serial=0)
>>> sys.version_info.major
2
>>> sys.version_info[0]
2

julia> using PyCall

julia> sys = pyimport("sys")
PyObject <module 'sys' (built-in)>

julia> sys.version_info
PyObject sys.version_info(major=2, minor=7, micro=16, releaselevel='final', serial=0)

julia> sys.version_info.major
2

julia> sys.version_info[1]
┌ Warning: `getindex(o::PyObject, i::Integer)` is deprecated, use `get(o, i - 1)` instead.
│   caller = top-level scope at none:0
└ @ Core none:0
2

[stevengj]

On Python 3 it is a named tuple that is getting converted to tuple. Just do sys.”version_info” to suppress the automatic conversion to Tuple.

[omus]

Thanks. That is helpful. Should the automatic conversion be changed to convert Python named tuples into Julia NamedTuples?

[tkf]

@omus FYI #175

[omus]

Thanks for the link. Since there is a way to get consistent behaviour using sys."version_info" between various versions of Python and NamedTuple conversion already has an issue I will close this issue.