I made a program for converting binary to decimal but it's not working can anybody please tell me what I have done wrong??

Question

binary_digits=' '
def input_function(binary_digits):
while binary_digits not in [0,1]:
binary_digits=input("Please enter your binary number here:")
return int(binary_digits)
def converter_function(binary_digits):
x=list(binary_digits)
for u in range (0,len(x)):
for i in range(1,len(x)):decimal_number == sum((x[u] * 2 ** (len(x) - i)))
return decimal_number
while True:
y=input_function(binary_digits)
z=converter_function(y)
print(f"The number in the decimal form is{z}")
break

Answer 1

Put decimal_number = sum((.....) in converter_functiom
You have given decimal_number == sum((.....)