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From the lower entry, can invoke Tcl code writing -np- followed some space and then some tcl code an press <Return>

Note: -np- mean ‘No-Process’ and the next command is expected to be Tcl code. It is used as a fast way to run a simple procedure or re-define code.

• Use copy/paste code after -np-

In particular there are some predefined Tcl procs that run python code, like GiD_Python_Exec (other possibilities are GiD_Python_Eval, GiD_Python_Call, …)that expects the python code to be evaluated

Example: matplotlib graph of a line

This is a simple example of call from Tcl a Python code that uses the matplotlib to show a graph (in new Tk window opened by tkinter)

GiD_Python_Exec {
    import matplotlib.pyplot as plt
    plt.plot([1, 2, 3, 4])
    plt.ylabel('some numbers')
    plt.show()
}

GiD_Python_Exec do an implicit package require tohil and then tohil::exec

Can invoke this Tcl code for example pasting it after -np- in the command line (with one or more spaces separating the code pasted), and press <return>

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then will appear a window like this

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• -np- GiD_Python_Source $your_filename_py

The normal way to write long Python code is write it in a .py file.

Note: Visual Studio Code is our recommended editor, installing the MS Python extension for this language.

Example: matplotlib graph of two curves

The file <GiD>/scripts/tohil/doc/demo_matplotlib.py contain a code like the one of the image

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and can source this file writing this (<GiD> must be replaced by the true path)

-np- GiD_Python_Source {<GiD>/scripts/tohil/doc/demo_matplotlib.py}

then this window will appear:

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