Circular Sentence Python Solution with Tests

lcpy gen -n 2490   # by problem number
lcpy gen -s circular_sentence   # by problem name

Input: sentence = "leetcode exercises sound delightful"
Output: true
Explanation: The words in sentence are ["leetcode", "exercises", "sound", "delightful"].
- leetcode's last character is equal to exercises's first character.
- exercises's last character is equal to sound's first character.
- sound's last character is equal to delightful's first character.
- delightful's last character is equal to leetcode's first character.
The sentence is circular.

Input: sentence = "eetcode"
Output: true
Explanation: The words in sentence are ["eetcode"].
- eetcode's last character is equal to eetcode's first character.
The sentence is circular.

Input: sentence = "Leetcode is cool"
Output: false
Explanation: The words in sentence are ["Leetcode", "is", "cool"].
- Leetcode's last character is not equal to is's first character.
The sentence is not circular.

class Solution:
    # Time: O(n)
    # Space: O(1)
    def is_circular_sentence(self, sentence: str) -> bool:
        for i, char in enumerate(sentence):
            if char == " " and sentence[i - 1] != sentence[i + 1]:
                return False
        return sentence[0] == sentence[-1]