我可以在python的字符串中定位输入吗？

text = "Hello, World!"
index = text.find("o")
print(index)  # 输出 4

text = "Hello, World!"
try:
    index = text.index("o")
    print(index)  # 输出 4
except ValueError:
    print("未找到匹配项")

text = "Hello, World!"
index = 0
while True:
    index = text.find("o", index)
    if index == -1:
        break
    print(index)
    index += 1

import re

text = "Hello, World!"
match = re.search(r"o", text)
if match:
    index = match.start()
    print(index)  # 输出 4