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copied!<p>It's not that simple: a package in Tcl appears to be a more abstract thing than that in Python.</p> <p>First, there are two kinds of packages: "classic" and <a href="http://wiki.tcl.tk/12999" rel="noreferrer">"modules"</a> which have different underlying mechanisms for finding what to load in response to the <code>package require ...</code> command.</p> <p>Next, both kinds of packages are able to do whatever they wish to provide their functionality. It means they can be (but not limited to):</p> <ul> <li>Pure Tcl packages, <code>source</code>'ing just one Tcl file or any number of files.</li> <li>Packages implemented in C or another compiled language, which are in the form of dynamic library which gets <code>load</code>ed when the package is required.</li> <li>A combination of the above, when there's a C library and a layer of Tcl code around it (usually providing helper/convenience commands).</li> </ul> <p>Hence the question per se has little sense as only <em>modules</em> are represented by exactly one self-contained file but "classic" packages are free to implement themselves as they see fit.</p> <p>On the other hand, each package normally provides (using one way or another) certain information to the package subsystem which can be retreived (and parsed) using the <code>package ifneeded</code> command. For instance, on my Windows system with ActiveState Tcl 8.5.x, I have:</p> <pre><code>% package require csv 0.7.2 % package ifneeded csv 0.7.2 package provide csv 0.7.2;source -encoding utf-8 {C:/Program Files/Tcl/lib/teapot/package/tcl/teapot/tcl8/8.3/csv-0.7.2.tm} </code></pre> <p>Note that what <code>package ifneeded</code> returns is just a <em>Tcl script</em> which is meant to be <code>eval</code>uated to get the package loaded, so parsing of this information is bound to be inherently ad-hoc and fragile.</p>

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