如何使用基数 10 修复 int() 的无效文字：''？

Question

Using python3.7 and tkinter to make a GUI, where I grab the input from 2 text boxes, and use a math formula then export it out.

I've looked through other forms and tried what they suggested and could not find how to fix it. I've tried global inside and outside of the function, setting the variable before the function.

def retrieve_input():
    global InputValue
    global InputValue2
    global Delay
    InputValue=tasks.get()
    InputValue2=proxies.get()
    print(InputValue)
    print(InputValue2)
    Delay=3500/int(InputValue)*int(InputValue2)
    print(Delay)
retrieve_input()
Label (window, width=12, text=Delay,bg="white",fg="Pink", font="none 22 bold") .grid(row=5, column=0,sticky=W)

Error:

  File ", line 29, in retrieve_input
    Delay=3500/int(InputValue)*int(InputValue2)
ValueError: invalid literal for int() with base 10: ''

Answer 1

It means that you are passing in an empty string to the int class constructor. You are effectively calling int('') . It looks like either tasks.get() or proxies.get() are returning the empty string.

In Short: Don't pass an empty string to int().

As for the comment you left:

try:
    Delay=3500/int(InputValue)*int(InputValue2)
except ValueError:
    pass
    #Handle a case in which the input is ''