爲什麼Python 3的tkinter導入語法似乎在Python 2中起作用？

Question

我通過Anaconda運行Python 2.7，並且沒有安裝Python 3，據我所知。我對輸入tkinter感到困惑。關於Stack Overflow的其他幾個問題表明tkinter中有單獨的模塊和略有不同的導入語法，具體取決於您是運行Python 2還是Python 3.然而，Python 3語法種類適用於Python 2中的我（請參閱以下代碼評論）。是什麼賦予了？

import sys 
print sys.version 
# prints: 2.7.12 |Continuum Analytics, Inc.| (default, Jun 29 2016, 11:07:13) [MSC v.1500 64 bit (AMD64)] 

# I hear these should not work in Python 2. 
# In reality, they work fine if run normally via the Python 2 interpreter. 
# However, they do NOT work when I use pyinstaller to make an executable. 
from tkinter import * 
from tkinter import ttk, messagebox 

# These work fine in Python 2, as they should, even if compiled into an exe. 
from Tkinter import * 
import ttk 
import tkMessageBox 

編輯：

針對布萊恩奧克利的評論中，print sys.path結果是：

['C:\\Users\\...\\tkinter test program', 
'C:\\Miniconda\\python27.zip', 
'C:\\Miniconda\\DLLs', 
'C:\\Miniconda\\lib', 
'C:\\Miniconda\\lib\\plat-win', 
'C:\\Miniconda\\lib\\lib-tk', 
'C:\\Miniconda', 
'C:\\Miniconda\\lib\\site-packages', 
'C:\\Miniconda\\lib\\site-packages\\win32', 
'C:\\Miniconda\\lib\\site-packages\\win32\\lib', 
'C:\\Miniconda\\lib\\site-packages\\Pythonwin', 
'C:\\Miniconda\\lib\\site-packages\\setuptools-23.0.0-py2.7.egg'] 

針對馬來熊的答案，這裏是我的電腦上會發生什麼：

C:\>python 
Python 2.7.12 |Continuum Analytics, Inc.| (default, Jun 29 2016, 11:07:13) [MSC 
v.1500 64 bit (AMD64)] on win32 
Type "help", "copyright", "credits" or "license" for more information. 
Anaconda is brought to you by Continuum Analytics. 
Please check out: http://continuum.io/thanks and https://anaconda.org 
>>> import tkinter 
>>> 

In res ponse到盧卡斯Rogalski的評論：

>>> import Tkinter 
>>> print Tkinter.__file__ 
C:\Miniconda\lib\lib-tk\Tkinter.pyc 
>>> import tkinter 
>>> print tkinter.__file__ 
C:\Miniconda\lib\site-packages\tkinter\__init__.pyc 
>>> 

爲應對馬來熊的答案的意見的討論，這是C:\Miniconda\lib\site-packages\tkinter\__init__.pyc的內容，這可以解釋爲什麼import tkinter工作即使我使用Python 2：

from __future__ import absolute_import 
import sys 

if sys.version_info[0] < 3: 
    from Tkinter import * 
else: 
    raise ImportError('This package should not be accessible on Python 3. ' 
         'Either you are trying to run from the python-future src folder ' 
         'or your installation of python-future is corrupted.') 

Answer 1

tkinter是一個適用於Python 3語法的Tk的Python 3包裝器層。
Tkinter是適用於Python 2語法的Tk的Python 2包裝器層。

導入命令是一樣的。但是您需要爲您用於編寫代碼的Python版本類型導入正確的包裝器。下面顯示python 2只能導入Tkinter而不是tkinter。

$ python 
Python 2.7.12 (default, Nov 19 2016, 06:48:10) 
[GCC 5.4.0 20160609] on linux2 
Type "help", "copyright", "credits" or "license" for more information. 
>>> import tkinter 
Traceback (most recent call last): 
    File "<stdin>", line 1, in <module> 
ImportError: No module named tkinter 
>>> import Tkinter 
>>> 

更新：如果Miniconda選擇從主流的做法偏離並做了幕後，讓你所描述的東西，比它在Miniconda的自由裁量權來完成。您的print tkinter.__file__命令顯示您有tkinter和print Tkinter.__file__命令顯示您有Tkinter。總之，Miniconda預裝了Tkinter和tkinter。你有沒有試過比較這兩個文件，看看它們是相同還是不同？