如何将从组合框中获得的字符串与我想要在Python中使用的特定浮点数相关联？

Question

Here's the situation:

I need to get a value (float) that is different from the selected option in the combobox (a string) and I don't know how to do it.

from tkinter import *
from tkinter import ttk

combo = ttk.Combobox(top, state="readonly")
combo["values"] = ("DAP", "MAP", "SPS", "SPT")
combo.current(0)
combo.grid(row=row, column=1)

DAP=46

MAP=52

SPS=21

SPT=46

combo.get() will fetch me "DAP" (if DAP is selected in the combobox obviously) and I want to get 46 in this case.

So when an option is chosen from the combobox I need to get a float (eg when someone selects DAP in the combobox I need to get or get returned 46 as a float). With combo.get() I'll get 'DAP' (If DAP is selected for example) and I want to get 46 instead (as a float).I need to relate each gotten string with the corresponding float.

I use it on this formula:

dosis = 50 / float(combo_dict.get((combo.get())) / 100)

Answer 1

Use a dict ( [Python]: Mapping Types — dict ):

combo_dict = {
    "DAP": 46,
    "MAP": 52,
    "SPS": 21,
    "SPT": 46,
}

and its usage (as current values are int s, convert them to float s):

float(combo_dict[combo.get()])

or better (in case the string returned by the combo is not present in combo_dict : [Python]: get ( key[, default] ) ):

float(combo_dict.get(combo.get(), -1))