如何在python中只读一个单词？

sentence = "This is a sample sentence"
words = sentence.split()
first_word = words[0]
print(first_word)  # 输出：This

import re

sentence = "This is a sample sentence"
first_word = re.findall(r'\b\w+\b', sentence)[0]
print(first_word)  # 输出：This

def get_first_word(sentence):
    word = ""
    for char in sentence:
        if char.isalpha():
            word += char
        else:
            break
    return word

sentence = "This is a sample sentence"
first_word = get_first_word(sentence)
print(first_word)  # 输出：This