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首先，本例利用了label,entry和button控件

label1=tk.Label(window,text='User name:',width=20,height=3)
label2=tk.Label(window,text='Password:',width=20,height=3)
entryVar1=tk.StringVar()
entry1=tk.Entry(window,textvariable=entryVar1)
entryVar2=tk.StringVar()
entry2=tk.Entry(window,textvariable=entryVar2,show='*')
button1=tk.Button(window,text='登录',command=login)
button2=tk.Button(window,text='取消',command=quit)

其次，布局格式全部用place,可以随意调整控件位置

然后，定义一个login函数，利用tk.messagebox的形式显示登录信息

def login():
    user_name=entryVar1.get()
    password=entryVar2.get()
    if user_name=='admin' and password=='1234':
        tk.messagebox.showinfo(title='提示',message='登录成功')
        window.quit()
    else:
        tk.messagebox.showwarning(title='提示',message='用户名或密码有误,请重新输入')

最后，完整的代码login.py

import tkinter as tk
import tkinter.messagebox

window=tk.Tk()
window.title("登录窗口")
window.geometry('500x400') #设置窗口尺寸

label1=tk.Label(window,text='User name:',width=20,height=3)
label1.place(x=100,y=50)
entryVar1=tk.StringVar()
entry1=tk.Entry(window,textvariable=entryVar1)
entry1.place(x=220,y=70)
label2=tk.Label(window,text='Password:',width=20,height=3)
label2.place(x=100,y=100)
entryVar2=tk.StringVar()
entry2=tk.Entry(window,textvariable=entryVar2,show='*')
entry2.place(x=220,y=120)
def login():
    user_name=entryVar1.get()
    password=entryVar2.get()
    if user_name=='admin' and password=='1234':
        tk.messagebox.showinfo(title='提示',message='登录成功')
        window.quit()
    else:
        tk.messagebox.showwarning(title='提示',message='用户名或密码有误,请重新输入')
button1=tk.Button(window,text='登录',command=login)
button1.place(x=250,y=150)
button2=tk.Button(window,text='取消',command=quit)
button2.place(x=320,y=150)
window.mainloop()

最后呈现的效果：