Python Tkinter温度转换器

Question

所以我做一个临时转换器，我只是不能得到它的华氏温度到摄氏温度。它的工作原理是从摄氏度到华氏度，但它不会以其他方式转换。我不知道是什么问题导致这我已经尝试了intvars和stringvars，但似乎没有解决这个问题，我也尝试了差异if语句，但它只是不能转换从法赫到cel。有人可以帮助我，告诉我什么是错的。这里是我有：

from Tkinter import* 


def convert(): 
    celTemp = celTempVar.get() 
    fahTemp = fahTempVar.get() 



    if celTempVar.get() != 0.0: 
     celToFah = (celTemp * 9/5 + 32) 
     print celToFah 
     fahTempVar.set(celToFah) 

    elif fahTempVar.get() != 0.0: 
     fahToCel = ((fahTemp - 32) * (5/9)) 
     print fahToCel 
     celTempVar.set(fahToCel) 



def reset(): 
    top = Toplevel(padx=50, pady=50) 
    top.grid() 
    message = Label(top, text = "Reset Complete") 
    button = Button(top, text="OK", command=top.destroy) 

    message.grid(row = 0, padx = 5, pady = 5) 
    button.grid(row = 1, ipadx = 10, ipady = 10, padx = 5, pady = 5) 

    fahTempVar.set(int(0)) 
    celTempVar.set(int(0)) 





###MAIN### 
root = Tk() 
root.title("Temperature Converter") 
mainframe = Frame(root) 
mainframe.grid() 

celTempVar = IntVar() 
celTempVar.set(int(0)) 
fahTempVar = IntVar() 
fahTempVar.set(int(0)) 


titleLabel = Label (mainframe, text = "Celcius/Fahrenheit Temperature", font = ("Arial", 20, "bold"), justify = CENTER) 
titleLabel.grid(row = 1, column = 1, columnspan = 3, pady = 10, padx = 20) 

celLabel = Label (mainframe, text = "Celcius: ", font = ("Arial", 16), fg = "red") 
celLabel.grid(row = 2, column = 1, pady = 10, sticky = NW) 

fahLabel = Label (mainframe, text = "Fahrenheit: ", font = ("Arial", 16), fg = "blue") 
fahLabel.grid(row = 3, column = 1, pady = 10, sticky = NW) 

celEntry = Entry (mainframe, width = 10, bd = 5, textvariable = celTempVar) 
celEntry.grid(row = 2, column = 1, pady = 10, sticky = NW, padx = 125) 


fahEntry = Entry (mainframe, width = 10, bd = 5, textvariable = fahTempVar) 
fahEntry.grid(row = 3, column = 1, pady = 10, sticky = NW, padx = 125) 

convertButton =Button (mainframe, text = "Convert", font = ("Arial", 8, "bold"), relief = RAISED, bd=5, justify = CENTER, highlightbackground = "red", overrelief = GROOVE, activebackground = "green", activeforeground="blue", command = convert) 
convertButton.grid(row = 4, column = 1, ipady = 8, ipadx = 12, pady = 5, sticky = NW, padx = 55) 

resetButton = Button (mainframe, text = "Reset", font = ("Arial", 8, "bold"), relief = RAISED, bd=5, justify = CENTER, highlightbackground = "red", overrelief = GROOVE, activebackground = "green", activeforeground="blue", command = reset) 
resetButton.grid(row = 5, column = 1,ipady = 8, ipadx = 12, pady = 5, sticky = NW) 

root.mainloop() 

Answer 1

问题是这样的一行：

fahToCel = ((fahTemp - 32) * (5/9)) 

的问题是5/9使用整数除法（因为两个输入到它是整数）计算;它恰好等于0，这不是你想要的！有一大堆可能的修复，但最简单的就是使用5.0/9.0，它明确地处理浮点除法。 （你也可以改变相反的方向，即使只是为了清楚。是的，它目前正在工作，但这是因为乘法 - 其具有浮点输入celTemp - 在除法之前被处理。）