invalid-syntax错误找不出来怎么办？

Question

自己根据已有代码改编升级；
但运行时总是显示语法错误，试着改了几次，没找到正确点
from tkinter import *
def register_fun():
global root
r1=Label(root,text="Name: ").grid(row=0)
r2=Label(root,text="Password:").grid(row=1)
r1.pack()
r2.pack()

def log_in():
global root
Label(root, text="User:").grid(row=0)
Label(root, text="Password:").grid(row=1)

root = Tk()
root.title("登录界面")

e1 = Entry(root)
e2 = Entry(root, show="*")
e3 = Entry(
e1.grid(row=0, column=1, padx=2, pady=1)
e2.grid(row=1, column=1, padx=2, pady=1)#错误的地方
def show():
print("User:<< % s>>" % e1.get())
print("Password:<< % s>>" % e2.get())
e1.delete(0, END)
e2.delete(0, END)

Button(root, text="register", width=5, command=register_fun)
Button.pack(side=LEFT)

root.mainloop()