Number of Segments in a String

Given a string s, return the number of segments in the string.

A segment is defined to be a contiguous sequence of non-space characters.

Example 1:

Input: s = "Hello, my name is John"
Output: 5
Explanation: The five segments are ["Hello,", "my", "name", "is", "John"]

Example 2:

Input: s = "Hello"
Output: 1

Constraints:

• 0 <= s.length <= 300
• s consists of lowercase and uppercase English letters, digits, or one of the following characters "!@#$%^&*()_+-=',.:".
• The only space character in s is ' '.

SOLUTION:

class Solution:
    def countSegments(self, s: str) -> int:
        prev = None
        ctr = 0
        for c in s:
            if (prev == None or prev == " ") and c != " ":
                ctr += 1
            prev = c
        return ctr