Call function inside a class

Question

I have tried to integrate the function W_Kpower(scpi_comm) into a class, but I get an error:

 keithley = rm.open_resource(instControl(inst_list))
NameError: global name 'self' is not defined

Could you help me to integrate the function into a class. I need that for the other classes in the future. I'm beginner, so I don't understand all the details of my code.

import Tkinter,visa,time
from ttk import *
root = Tkinter.Tk
rm = visa.ResourceManager()
# Split port touple into a list
inst_list = []
str_inst = rm.list_resources()
for i in str_inst:
 inst_list.append(i.split(","))
# Convert list into a string and replace it
def delChar(inst,input_inst):
 str_new = ''.join(str(e) for e in inst_list[input_inst])
 find_char = "()u[]"
 for char in find_char:
 inst = str_new.replace(char,"")
 return inst
def delCharIn(list_del):
 str_new = ''.join(str(e) for e in list_del)
 find_char = "()u[]"
 for char in find_char:
 list_del = str_new.replace(char,"")
 return list_del
# List the instruments and choose one
def instControl(inst):
 new_list = []
 for index in range(len(inst)):
 new_list.append(delCharIn(inst[index]))
 return new_list
#keithley = rm.open_resource(instControl(inst_list))
class InterfaceApp(root):
 def __init__(self,parent):
 root.__init__(self,parent)
 self.parent = parent
 self.initialize()
 def initialize(self):
 frInstrument = Tkinter.Frame(width=800, height=200, bg="", 
 colormap="new")
 frInstrument.grid(row=0,sticky='EW')
 separator = Tkinter.Frame(width=800, height=2, bd=1, relief='sunken')
 separator.grid(row=1)
 frSettings = Tkinter.Frame(width=800, height = 400, bg="",
 colormap="new")
 frSettings.grid(row=3,sticky='EW')
 self.grid_columnconfigure(0,weight=1)
 self.resizable(False,False)
 groupInstrument = Tkinter.LabelFrame(frInstrument,
 text="Choose an Instruments",
 padx = 5, pady=5)
 groupInstrument.grid(row = 0, column = 1, sticky="EW")
 choices = instControl(inst_list)
 self.choiceVarPower = Tkinter.StringVar()
 self.choiceVarPower.set(choices[0])
 inst1 =Combobox(groupInstrument, values = choices,textvariable = 
 self.choiceVarPower)
 inst1.grid(row=0, column=2,sticky="EW",padx=2,pady=2)
 instLabel1 = Tkinter.Label(groupInstrument, text="Power Supply: ")
 instLabel1.grid(row=0,column=1,sticky='EW')
 instLabel2 = Tkinter.Label(groupInstrument, text="Multimeter: ")
 instLabel2.grid(row=1,column=1,sticky='EW')
 self.choiceVarMulti = Tkinter.StringVar()
 self.choiceVarMulti.set(choices[0])
 inst2 = Combobox(groupInstrument, values=choices, textvariable = 
 self.choiceVarMulti)
 inst2.grid(row=1,column=2,sticky='EW',padx=2,pady=2)
 but_start = Tkinter.Button(frSettings,text='Run',
 command=self.Run)
 but_start.grid(row=0,column=1,sticky='EW')
 but_closeInst = Tkinter.Button(frSettings,text="Close all instruments",
 command = self.closeInst)
 but_closeInst.grid(row=0,column=2,sticky='EW')
 def W_KPower(scpi_comm):
 return self.keithleyPower.write(":syst:loc")
 def closeInst(self):
 W_KPower(":syst:loc")
 def Run(self):
 self.keithleyPower = rm.open_resource(self.choiceVarPower.get())
 self.keithleyMultimeter = rm.open_resource(self.choiceVarMulti.get())
if __name__ == '__main__':
 app = InterfaceApp(None)
 app.title("")
 app.mainloop()

Answer 1

You are missing a self in the method definition here:

def W_KPower(scpi_comm): # this should be def W_KPower(self, scpi_comm)
 return self.keithleyPower.write(":syst:loc")

and I think here, you need self.:

def closeInst(self):
 W_KPower(":syst:loc") # this should be self.W_KPower(":syst:loc")