from tkinter import *
root = Tk()
w = root.winfo_screenwidth()
h = root.winfo_screenheight()
w = w // 2
h = h // 2
w = w - 200
h = h - 200
root.geometry('400x400+{}+{}'.format(w, h))
root.title("Панграм")
def is_pangram(phrase):
    alphabet = "abcdefghijklmnopqrstuvwxyz"
    for char in alphabet:
        if char not in phrase:
            return False
    return True
e = Entry(root, width = 50)
e.pack()
e.insert(0,"Введите текст")
b = Button(root, text="Узнать панграм", command=is_pangram); b.pack()
root.mainloop()
А вот ошибка, которую мне выдаёт: 
Exception in Tkinter callback
Traceback (most recent call last):
  File "Programs\Python\Python39\lib\tkinter\__init__.py", line 1892, in __call__
    return self.func(*args)
TypeError: is_pangram() missing 1 required positional argument: 'phrase'

[code python]между этимим тегами вставлять код[/code]

 from tkinter import *
root = Tk()
w = root.winfo_screenwidth()
h = root.winfo_screenheight()
w = w // 2
h = h // 2
w = w - 200
h = h - 200
root.geometry('400x400+{}+{}'.format(w, h))
root.title("Панграм")
class __call__():
    def is_pangram(phrase):
        alphabet = "abcdefghijklmnopqrstuvwxyz"
        for char in alphabet:
            if char not in phrase:
                return False
                return True
e = Entry(root, width = 50)
e.pack()
e.insert(0,"Введите текст")
b = Button(root, text="Узнать панграм", command=is_pangram); b.pack()
root.mainloop()
И у меня появилась новая ошибка, которая не распознаёт имя is_pangram:
Traceback (most recent call last):
  File "", line 26, in <module>
    b = Button(root, text="Узнать панграм", command=is_pangram); b.pack()
NameError: name 'is_pangram' is not defined

 from tkinter import *
root = Tk()
w = root.winfo_screenwidth()
h = root.winfo_screenheight()
w = w // 2
h = h // 2
w = w - 200
h = h - 200
root.geometry('400x400+{}+{}'.format(w, h))
root.title("Панграмм")
c=0
def is_pangram():
    if c in 'abcdefghijklmnopqrstuvwxyz':
        True
    else:
        False
e = Entry(root, width = 50)
e.pack()
e.insert(0,"Введите текст")
b = Button(root, text="Узнать панаграмм", command = is_pangram); b.pack()
root.mainloop()