human
Give me a code to longest sub string of 0 's in a binary string which is repeated K times and the other steps required given the following:
Longest sub string of 0 's in a binary string which is repeated K times | Function to find the longest subof 0 's.
To store size of the string.
To store the required answer.
Find the longest subof 0 's.
Run a loop upto s [ i ] is zero.
Check the conditions.
Driver code.
Function call"
How can the above be solved in Python?
assistant
#Here is code to longest sub string of 0 's in a binary string which is repeated K times and the other steps required.
 def longest_substring ( s , k ) :
	n = len ( s )
	if ( k > 1 ) :
		s += s
		n *= 2
	ans = 0
	i = 0
	while ( i < n ) :
		x = 0
		while ( i < n and s [ i ] == '0' ) :
			x , i = x + 1 , i + 1
		ans = max ( ans , x )
		i += 1
	if ( k == 1 or ans != n ) :
		return ans
	else :
		return ( ans // 2 ) * k
s = "010001000"
k = 4
print ( longest_substring ( s , k ) )