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POPython Execution Order with GUI
 

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  1. POPython Execution Order with GUI
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    <p>I'm having some issues with the following code. This is the first time that I'm working with a GUI and it's been a while since I've worked with python as well. When I try to execute the solfield function with the button, it yields no output.</p> <pre><code>from Tkinter import * import math master = Tk() n = float() I = float() def solfield(): pass label_coils = Label(text='Number of Coils Per Meter', textvariable=n) label_coils.grid() coils = Entry(master) coils.grid() label_current = Label(text='Current in Amps', textvariable=I) label_current.grid() current = Entry(master) current.grid() calculate_button = Button(text='Calculate', command=solfield()) calculate_button.grid() label_bfield = Label(text='B Field in +z Direction') label_bfield.grid() label_result = Label(text='solfield') label_result.grid() master.title('Coil Gun Simulation') master.mainloop() def solfield(): mu0 = math.pi*4e-7 solfield = mu0*n*I print solfield </code></pre> <p>Any other tips would be appreciated as well, as there will eventually be much more coding for me to do.</p> <p>This has been solved. If anyone is interested, here is the code after several fixes were made:</p> <pre><code>from Tkinter import * import math master = Tk() label_coils = Label(text='Number of Coils Per Meter') label_coils.grid() coils = Entry(master) coils.grid() label_current = Label(text='Current in Amps') label_current.grid() current = Entry(master) current.grid() def solfield(): mu0 = math.pi*4e-7 n = float(coils.get()) I = float(current.get()) fieldmag = mu0*n*I print fieldmag calculate_button = Button(text='Calculate', command=solfield) calculate_button.grid() label_bfield = Label(text='B Field in +z Direction') label_bfield.grid() label_result = Label(text='solfield') label_result.grid() master.title('Coil Gun Simulation') master.mainloop() </code></pre>
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    1. USdanielunderwood
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    1. COYou should use a different variable name than `solfield` in your `solfield` function. That is likely to give you problems.
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      1. USSethMMorton
    2. COAs a side note, `n = float()` is the same as `n = 0.0`, and there's really no good reason to do it in the first place. I don't think you want a global variable for this. If you do, you probably don't want it to be 0 (otherwise `solfield()` will always print `0`…). So, presumably you're going to set a "real value" at some point. If so, you don't need to set it to `float()` first and then later set it to the real value. Python doesn't require you to "declare variables at the top" like C.
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      1. USabarnert
 

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