Question

if checked_a==1:
dulj_a=math.sqrt(stranica_1_duljina **2 - stranica_2_duljina**2)                                    #riješiti str_a
str_dulj_a= str(dulj_a)

ispis_dulj_a=Label(window, text= dulj_a , font=("Arial", 30,"bold"), bg="lightblue")
ispis_dulj_a.place(x=1250,y=800)



def ispis_a():
    ispis_a_text=Label(window, text="Duljina stranice a iznosi" + str_dulj_a  , font=("Arial", 30,"bold"), bg="lightblue")
    ispis_a_text.place(x=1200,y=800)

错误：

File "C:\Users\Korisnik\AppData\Local\Programs\Python\Python37-32\lib\tkinter\__init__.py", line 1705, in __call__
    return self.func(*args)
  File "G:\Python-programi\Pitagora v2.py", line 159, in ispis_a
    ispis_a_text=Label(window, text="Duljina stranice a iznosi" + str_dulj_a  , font=("Arial", 30,"bold"), bg="lightblue")
NameError: name 'str_dulj_a' is not defined

Answer 1

由于checked_a是一个按钮，如果启用，它将等于1。如果该按钮关闭，该怎么办，您还可以在调用str_dulj_a之前在代码行中的其他地方定义ispis_a

喜欢

if checked_a==1:
   dulj_a=math.sqrt(stranica_1_duljina **2 - stranica_2_duljina**2)                                    
   #riješiti str_a
   str_dulj_a= str(dulj_a)
else:
   str_dulj_a = "some string"

或在开始时进行初始化

str_dulj_a = "init string"

if checked_a==1:
   dulj_a = math.sqrt(stranica_1_duljina **2 - stranica_2_duljina**2)
   str_dulj_a = str(dulj_a)

ispis_dulj_a=Label(window, text= dulj_a , font=("Arial", 30,"bold"), bg="lightblue")
ispis_dulj_a.place(x=1250,y=800)

def ispis_a():
    # Now you have a defined string of `str_dulj_a`
    ispis_a_text=Label(window, text="Duljina stranice a iznosi" + str_dulj_a  , font=("Arial", 30,"bold"), bg="lightblue")
    ispis_a_text.place(x=1200,y=800)

由于输入而未在Label中定义字符串，Python

1 个答案: