Question

我想循环编写以下代码。不幸的是，我的循环根本不起作用。谁能帮助我将StringVar，标签和输入框放入for或while循环中？

airp_elev = tkinter.StringVar()
QNH = tkinter.StringVar()
OAT = tkinter.StringVar()

L0 = tkinter.Label(root, text = "Welcome to the density altutude calculator!", fg = "red").grid(row = 0, column = 1, sticky = "W", padx = 10, pady = 10)
L1 = tkinter.Label(root, text = "Airport elevation [ft]").grid(row = 1, column = 0, sticky = "W", padx = 10, pady = 10)
L2 = tkinter.Label(root, text = "QNH [hPa]").grid(row = 2, column = 0, sticky = "W", padx = 10, pady = 10)
L3 = tkinter.Label(root, text = "Ourside air temperature [°C]").grid(row = 3, column = 0, sticky = "W", padx = 10, pady = 10)

E1 = tkinter.Entry(root, textvariable = airp_elev, bd = 5).grid(row = 1, column = 1)
E2 = tkinter.Entry(root, textvariable = QNH, bd = 5).grid(row = 2, column = 1)
E3 = tkinter.Entry(root, textvariable = OAT, bd = 5).grid(row = 3, column = 1)

Answer 1

这是一个方便的函数，称为enumerate，当您要grid一系列小部件时，该函数特别有用。您可以阅读here。

由于您将标签和条目并排对齐，因此实际上可以通过在for循环中一起使用zip和enumerate来一次性完成这两个操作：

import tkinter

root = tkinter.Tk()

airp_elev = tkinter.StringVar()
QNH = tkinter.StringVar()
OAT = tkinter.StringVar()
all_labels = ("Airport elevation [ft]","QNH [hPa]","Ourside air temperature [°C]") #group your labels together
all_var = (airp_elev,QNH,OAT) #group your vars together

L0 = tkinter.Label(root, text = "Welcome to the density altutude calculator!", fg = "red").grid(row = 0, column = 1, sticky = "W", padx = 10, pady = 10)

for num,i in enumerate(zip(all_labels,all_var),1): #enumerate through both lists
    label, entry = i #unpack the tuple i into two easy to read variables
    tkinter.Label(root,text=label).grid(row=num,column=0,sticky = "W", padx = 10, pady = 10)
    tkinter.Entry(root, textvariable=entry, bd=5).grid(row=num, column=1)

tkinter.Button(root,text="Print result",command=lambda: print(airp_elev.get(),QNH.get(),OAT.get())).grid(row=4,column=0,columnspan=2)

root.mainloop()

Answer 2

这是一个小例子。您的问题可能与需要从小部件创建中分离.grid（或打包任何内容）方法有关，否则您将丢失对小部件的引用。

import tkinter as tk
from tkinter import Tk

def print_myvars():
    for key in myvars:
        print(myvars[key].get())

root = Tk()

fields = ['One', 'Two', 'Three']
myvars = dict()
widgets = dict()

for field in fields:
    myvars[field] = tk.StringVar()
    widgets[field] = tk.Entry(
        root, text=field, textvariable=myvars[field])
    widgets[field].pack()

print_myvars_button = tk.Button(
    root, text='Print Vars', command=print_myvars)
print_myvars_button.pack()

root.mainloop()

Answer 3

我想向您展示我的代码。这是一个密度高度计算器，密度高度计算主要用于航空领域。

    import tkinter

    root = tkinter.Tk()
    root.title("Density altitude calculator")
    root.geometry("500x275")

    airp_elev = tkinter.StringVar()
    QNH = tkinter.StringVar()
    OAT = tkinter.StringVar()
    all_labels = ("Airport elevation [ft]","QNH [hPa]","Ourside air temperature [°C]") #group your labels together
    all_var = (airp_elev,QNH,OAT) #group your vars together

    L0 = tkinter.Label(root, text = "Welcome to the density altutude calculator!", fg = "red").grid(row = 0, column = 1, sticky = "W", padx = 10, pady = 10)

    def calculateda():
        ad_elev = float(airp_elev.get())
        pres = float(QNH.get())
        temp = float(OAT.get())

        QNE = 1013
        isa_st = 15

        ad = ((QNE - pres) * 28)
        pa = ad_elev + ad

        st_pa = isa_st - (pa / 1000 * 2)

        hd = 120 * (temp - st_pa)
        da = round(pa + hd)

        labelresult = tkinter.Label(root, text = "The density altitude is: %.d ft" % da).grid(row = 7, column = 1, padx = 10, pady = 10)
        return 

    for num,i in enumerate(zip(all_labels, all_var),1): #enumerate through both lists
        label, entry = i #unpack the tuple i into two easy to read variables
        tkinter.Label(root, text = label).grid(row = num, column =0 , sticky = "W", padx = 10, pady = 10)
        tkinter.Entry(root, textvariable = entry, bd = 5).grid(row = num, column = 1)

    b1 = tkinter.Button(root, text = "Calculate density altitude", command = calculateda).grid(row = 4, column = 1, padx = 10, pady = 10)

   root.mainloop()

如果您有任何想法如何改进此代码，请回答。欢迎任何评论。

亲切的问候凯文

更好地编码python tkinter

3 个答案: