Python中startswith()方法详解

str.startswith(prefix[, start[, end]])

str1 = "Hello, world!"
print(str1.startswith("Hello"))  # 输出 True
print(str1.startswith("hello"))  # 输出 False

str2 = "Python is a powerful language"
print(str2.startswith("Python"))  # 输出 True
print(str2.startswith("is"))  # 输出 False

str3 = "abcdefg"
prefixes = ["ab", "cd", "ef"]
for prefix in prefixes:
    print(str3.startswith(prefix))

True
False
True

str4 = "Hello, world!"
print(str4.startswith("world", 7))  # 输出 True
print(str4.startswith("world", 8))  # 输出 False

str5 = "Hello, world!"
print(str5.startswith("Hello", 0, 5))  # 输出 True
print(str5.startswith("Hello", 0, 4))  # 输出 False