How is Tkinter multiplying the user on the number with the floating point?

[Mystic]

In any attempt in Tkinter, multiplying the user ' s numbers on the assigned number of melting points makes a mistake. When identifying the type float(TypeError: float() argument must be a string or a number, not 'NoneType'), and if int - ValueError: invalid literal for int() with base 10: '0.0'.

num1 = float(a.get())
num2 = float(b.get())
num2 = b.set(num1*785.9)
num1 = a.set(num2*456.7)

The value of the first field in the second entry should be multiplied by example and vice versa.

[rielyn]

Take away the assignment when you do .set(...)♪

b.set(num1*785.9)
a.set(num2*456.7)

These functions do not return anything (i.e., in fact, returning None) And that's what you're wiping the variables. num1 and num2♪