仅当语句在 (if/elif/else) 中起作用

Question

我正在尝试为学校项目创建一个单位转换器。 我很接近完成它，但后来这件事来了。 我有 4 个具有不同命令的不同按钮。 所以有四个不同的函数，其中包含 if/else 语句。 （按钮 1 + 功能 1，按钮 2 + 功能 2）等等。 但是当我运行它时，只有“if”语句在起作用。

from tkinter import Text, Tk
from tkinter import messagebox
from tkinter.font import Font

#----------------------window------------------------------

root = Tk()
root.title("Unit Converter")
root.geometry("1920x1280")

#----------------------list--------------------------------

firstunits = ["mm", "cm", "m", "km",]

#----------------------define------------------------------

clicked = StringVar()
clicked.set(firstunits[0])

value = Font(size=15, family="Helvetica", weight="bold")

global optmm
inpt = Entry(root, width=30, borderwidth=5)
inpt.config(font=value)
inpt.place(x=550, y=300, anchor=W)

def click(*firstunits):

    if firstunits[0] == "mm":
        inpt.delete(0, END)
        mm.config(font=option, bg="#202121", fg="white")
        cm.config(font=option, bg="#202121", fg="white")
        m.config(font=option, bg="#202121", fg="white")
        km.config(font=option, bg="#202121", fg="white")
        mm.place(x=-500, y=370, anchor=W)
        cm.place(x=565, y=370, anchor=W)
        m.place(x=715, y=370, anchor=W)
        km.place(x=815, y=370, anchor=W)


    elif firstunits[0] == "cm":
        inpt.delete(0, END)
        mm.config(font=option, bg="#202121", fg="white")
        cm.config(font=option, bg="#202121", fg="white")
        m.config(font=option, bg="#202121", fg="white")
        km.config(font=option, bg="#202121", fg="white")
        mm.place(x=515, y=370, anchor=W)
        cm.place(x=-615, y=370, anchor=W)
        m.place(x=715, y=370, anchor=W)
        km.place(x=815, y=370, anchor=W)


    elif firstunits[0] == "m":
        inpt.delete(0, END)
        mm.config(font=option, bg="#202121", fg="white")
        cm.config(font=option, bg="#202121", fg="white")
        m.config(font=option, bg="#202121", fg="white")
        km.config(font=option, bg="#202121", fg="white")
        mm.place(x=515, y=370, anchor=W)
        cm.place(x=615, y=370, anchor=W)
        m.place(x=-715, y=370, anchor=W)
        km.place(x=815, y=370, anchor=W)


    elif firstunits[0] == "km":
        inpt.delete(0, END)
        mm.config(font=option, bg="#202121", fg="white")
        cm.config(font=option, bg="#202121", fg="white")
        m.config(font=option, bg="#202121", fg="white")
        km.config(font=option, bg="#202121", fg="white")
        mm.place(x=515, y=370, anchor=W)
        cm.place(x=615, y=370, anchor=W)
        m.place(x=715, y=370, anchor=W)
        km.place(x=-815, y=370, anchor=W)


def result1(): #mm

    #cm to mm
    if firstunits[0] == "cm":
        number = inpt.get()
        inpt.delete(0, END)
        output = float(number) * 10
        inpt.insert(0, output)

    #m to mm
    elif firstunits[0] == "m":
        number1 = inpt.get()
        inpt.delete(0, END)
        output1 = float(number1) * 1000
        inpt.insert(0, output1)

    #km to mm
    else:
        number2 = inpt.get()
        inpt.delete(0, END)
        output2 = float(number2) * 1000000
        inpt.insert(0, output2)


def result2(): #cm

    #mm to cm
    if firstunits[0] == "mm":
        number3 = inpt.get()
        inpt.delete(0, END)
        output3 = float(number3) / 10
        inpt.insert(0, output3)

    #m to cm
    elif firstunits[0] == "m":
        number4 = inpt.get()
        inpt.delete(0, END)
        output4 = float(number4) * 100
        inpt.insert(0, output4)

    #km to cm
    else:
        number5 = inpt.get()
        inpt.delete(0, END)
        output5 = float(number5) * 100000
        inpt.insert(0, output5)


def result3(): #m

    #mm to m
    if firstunits[0] == "mm":
        number6 = inpt.get()
        inpt.delete(0, END)
        output6 = float(number6) / 1000
        inpt.insert(0, output6)

    #cm to m
    elif firstunits[0] == "cm":
        number7 = inpt.get()
        inpt.delete(0, END)
        output7 = float(number7) / 100
        inpt.insert(0, output7)

    #km to m
    else:
        number8 = inpt.get()
        inpt.delete(0, END)
        output8 = float(number8) * 1000
        inpt.insert(0, output8)


def result4(): #km

     #mm to km
    if firstunits[0] == "mm":
        number9 = inpt.get()
        inpt.delete(0, END)
        output9 = float(number9) / 1000000
        inpt.insert(0, output9)

    #cm to km
    elif firstunits[0] == "cm":
        number10 = inpt.get()
        inpt.delete(0, END)
        output10 =  float(number10) / 100000
        inpt.insert(0, output10)

    #m to km
    else:
        number8 = inpt.get()
        inpt.delete(0, END)
        output12 = float(number8) / 1000
        inpt.insert(0, output12)


#----------------------customize----------------------------

main = Font(size=40, family="Helvetica", weight="bold")
option = Font(size=20, family="Helvetica", weight="bold")
units = Font(size=20, family="Helvetica", weight="bold")

#-----------------------main--------------------------------

title = Label(root, text="UNIT CONVERTER", padx=1920, pady=80)
f_units = OptionMenu(root, clicked, *firstunits, command=click)
mm = Button(root, text="mm", command=result1)
cm = Button(root, text="cm", command=result2)
m = Button(root, text="m", command=result3)
km = Button(root, text="km", command=result4)

#-------------------apply customize-------------------------

root.config(bg="white")
title.config(font=main, bg="#202121", fg="white")
f_units.config(font=units, bg="#202121", fg="white")

#-------------------displacement----------------------------

title.place(x=665, y=100, anchor=CENTER)
f_units.place(x=450, y=300, anchor=W)

#---------------------loop-----------------------------------

root.mainloop()

what i want : when the chosen dropdown item is mm or cm or any of the list, the typed value will be converted to the clicked button from the chosen dropdown item

what the code does : when the chosen dropdown item is mm, the button works perfectly fine but when the dropdown is other than mm, it will not give any error but instead use the "if list is mm" function or imma say only the " if”正在工作并且对于def result1():只有“else”语句在工作。

我将不胜感激任何帮助

谢谢