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| 55 | <H2><A NAME="SECTION0018150000000000000000"> |
| 56 | 16.1.5 How Tk and Tkinter are Related</A> |
| 57 | </H2> |
| 58 | <P> |
| 59 | <span class="note"><b class="label">Note:</b> |
| 60 | This was derived from a graphical image; the image will be used |
| 61 | more directly in a subsequent version of this document.</span> |
| 62 | |
| 63 | <P> |
| 64 | From the top down: |
| 65 | <DL> |
| 66 | <DT><STRONG>Your App Here (Python)</STRONG></DT> |
| 67 | <DD>A Python application makes a <tt class="module"><a href="module-Tkinter.html">Tkinter</a></tt> call. |
| 68 | |
| 69 | <P> |
| 70 | </DD> |
| 71 | <DT><STRONG>Tkinter (Python Module)</STRONG></DT> |
| 72 | <DD>This call (say, for example, creating a button widget), is |
| 73 | implemented in the <em>Tkinter</em> module, which is written in |
| 74 | Python. This Python function will parse the commands and the |
| 75 | arguments and convert them into a form that makes them look as if they |
| 76 | had come from a Tk script instead of a Python script. |
| 77 | |
| 78 | <P> |
| 79 | </DD> |
| 80 | <DT><STRONG>tkinter (C)</STRONG></DT> |
| 81 | <DD>These commands and their arguments will be passed to a C function |
| 82 | in the <em>tkinter</em> - note the lowercase - extension module. |
| 83 | |
| 84 | <P> |
| 85 | </DD> |
| 86 | <DT><STRONG>Tk Widgets (C and Tcl)</STRONG></DT> |
| 87 | <DD>This C function is able to make calls into other C modules, |
| 88 | including the C functions that make up the Tk library. Tk is |
| 89 | implemented in C and some Tcl. The Tcl part of the Tk widgets is used |
| 90 | to bind certain default behaviors to widgets, and is executed once at |
| 91 | the point where the Python <tt class="module"><a href="module-Tkinter.html">Tkinter</a></tt> module is |
| 92 | imported. (The user never sees this stage). |
| 93 | |
| 94 | <P> |
| 95 | </DD> |
| 96 | <DT><STRONG>Tk (C)</STRONG></DT> |
| 97 | <DD>The Tk part of the Tk Widgets implement the final mapping to ... |
| 98 | |
| 99 | <P> |
| 100 | </DD> |
| 101 | <DT><STRONG>Xlib (C)</STRONG></DT> |
| 102 | <DD>the Xlib library to draw graphics on the screen. |
| 103 | </DD> |
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