Python While loops and For loops

Question

Is there a way for me to use for loops with not equal marks like you can you with while loops? For example, how can I convert while num!=0 to for loop

I created a code for converting binary to decimal using a while loop and I wanted to know how I could change it to using a for loop instead. I also need help displaying the value of each one bit(for example: 1 is 16; 1 is 8; 1 is 4 *or from right to left*)

I inserted my code below:

n1 = int(input("Enter binary number: "))

def binToDec(num):

sum = 0

i = 0

while num!=0:

remainder = num % 10

sum = sum + remainder * pow(2,i)

num = int(num/10)

i = i+1

print('Decimal Number : ', sum)

binToDec(n1)

//end

the output is:

Enter binary number: 1111

Decimal Number : 15

Answer 1

You can use the for loop because you know the length of the input string...

def bin2dec(bitStr):

strLen = len(bitStr)

expo = int(strLen)-1

sum=0

for i in range(int(strLen)):

if (bitStr[i]=='1'):

sum = int(sum) + pow(2,expo)

expo=int(expo)-1

return(sum)

#ASSUMES the user will input a pure bit string and not garbage

bitStr = input("Please input binary string:>")

print(bin2dec(bitStr))