human
Count binary strings of length same as given string after removal of substrings "01" and "00" that consists of at least one '1' | Function to count the strings consisting of at least 1 set bit.
Initialize count.
Iterate through string.
The answer is 2 ^ N - 1.
Driver Code.
Given string.
Function call"
How can the above be solved in Python?

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Give me a code to count binary strings of length same as given string after removal of substrings "01" and "00" that consists of at least one '1' and the other steps required?
assistant
#Here is code to count binary strings of length same as given string after removal of substrings "01" and "00" that consists of at least one '1' and the other steps required.
 def countString ( S ) :
	count = 0
	for i in S :
		if ( i == '0' and count > 0 ) :
			count -= 1
		else :
			count += 1
	print ( ( 1 << count ) - 1 )
if __name__ == " _ _ main _ _ " :
	S = "1001"
	countString ( S )