Python中的子字符串搜索

string = "Hello, World!"
substring = "World"
index = string.find(substring)
if index != -1:
    print("子字符串在位置", index, "处找到")
else:
    print("未找到子字符串")

string = "Hello, World!"
substring = "World"
try:
    index = string.index(substring)
    print("子字符串在位置", index, "处找到")
except ValueError:
    print("未找到子字符串")