python中如何判断字符串是否以特定字符开头_Python字符串startswith()方法用法

startswith()

startswith()

string = "Hello, world!"

# 检查字符串是否以 "Hello" 开头
result = string.startswith("Hello")
print(result)  # 输出: True

# 检查字符串是否以 "world" 开头
result = string.startswith("world")
print(result)  # 输出: False

# 可以传入一个元组，检查字符串是否以元组中的任意一个前缀开始
prefixes = ("Hello", "Goodbye")
result = string.startswith(prefixes)
print(result) # 输出: True

# 还可以指定起始和结束位置
result = string.startswith("world", 7) # 从索引7开始检查
print(result) # 输出: True

result = string.startswith("Hello", 0, 5) # 从索引0开始，到索引5结束（不包括5）
print(result) # 输出: True

startswith()

startswith()

startswith()

string = "Hello, world!"
prefix = "hello"

# 区分大小写
result = string.startswith(prefix)
print(result)  # 输出: False

# 不区分大小写
result = string.lower().startswith(prefix.lower())
print(result)  # 输出: True

startswith()

startswith()

startswith()

startswith()

startswith()

string = "Hello, world!"
prefix = "Hello"

# 使用切片
result = string[:len(prefix)] == prefix
print(result)  # 输出: True

startswith()

prefix

string

startswith()

False