tkinter.TclError: can't find package treectrl The wrapper library you are using TkTreectrl for tkinter has this statement somewhere: ver = master.tk.call('package', 'require', 'treectrl') which means you are trying to import the package treectrl from tk, but apparently that package does not exist. Complete documentation for ActiveTcl 8.6.9. ActiveTcl 8.6.9 Documentation. Get ActiveTcl Release notes Windows installation Linux/Unix Installaton macOS Installation License Get Started Package Reference Tcl 8.6.9 docs Contact Us Tcl8.6.9/Tk8.6.9 Documentation incr Tcl Package Commands, version 4.1.2 Tcl/Tk.

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Packages are used for creating reusable units of code. A package consists of a collection of files that provide specific functionality. This collection of files is identified by a package name and can have multiple versions of same files. The package can be a collection of Tcl scripts, binary library, or a combination of both.

Package uses the concept of namespace to avoid collision of variable names and procedure names. Check out more in our next 'namespace' tutorial.

Creating Package

A package can be created with the help of minimum two files. One file contains the package code. Other file contains the index package file for declaring your package.

The list of steps for creating and using package is given below.

STEP 1 : Creating Code

Create code for package inside a folder say HelloWorld. Let the file be named HelloWorld.tcl with the code as shown below −

STEP 2 : Creating Package Index

Open tclsh. Switch to HelloWorld directory and use the pkg_mkIndex command to create the index file as shown below −

STEP 3 : Adding Directory to Autopath

Use the lappend command to add the package to the global list as shown below −

Agile with a bottleneck on external api development. Today, Git is effectively the de-facto standard for software version control, and it is truly an expected tool in every developer’s toolbox.

STEP 4 : Adding Package

Next add package to program using package require statement as shown below −

STEP 5 : Invoking Procedure

Now, everything being setup, we can invoke our procedure as shown below −

You will get the following result −

First two steps create the package. Once package is created, you can use it in any Tcl file by adding the last three statements as shown below −

You will get the following result −

See also the file for more getting-started help.Table of contents:.This is a C toolkit for writing visual psychophysics experiments. Various abstractions relating to experiments (visual objects, trials, observer responses, etc.) are implemented in C, and are exposed through a Tcl interface as scriptable objects.Note that sitting beside this file is a file which should contain some useful examples of how to get started actually using the program.The src/ directory contains subdirectories for each of the various components of the system. Packages that are configured to be loadable at run-time are found in src/pkgs/.When the system is built, the object files go into a hierarchy within build/obj/ that parallels src/. That is, a source file src/foo/bar.cc will be compiled to build/obj/foo/bar.o. Assume /path/to/install is where you will install local packages. John deere scotts mower parts. Assume /path/to/source is where you unpack and build these packagesThis software requires these development packages:.

Tcl/Tk (version 8.5 or later). X11 windowing system OR Mac OS X's Aqua windowing system.

OpenGL (3-D graphics library). libz (gzip library).

libexpat (XML parsing library)The following additional packages are optional.