python元组

python

python元组" title="python元组">python元组

1.定义

在一堆小括号中的数据,不同元素使用逗号隔开,列表可变,元组不可变。

tuple_a = ("nginx","httpd","tomcat")

print(type(tuple_a))

# 元组数据类型可以任意

tuple_b = (10,3.14,"nginx",["redis","monogodb"],("mysql","oracle"))

print(type(tuple_b))

# 单个元素的元组

tuple_c = ("nginx",) # 注意元素后面的逗号,不可少

print(type(tuple_c))

2.元组的常规操作

len() in , not in

2.1 索引

tuple_a = ("nginx","httpd","iis")

print(tuple_a[1])

tuple_a[1] = "tomcat" # 错误:元组是不可变的

# 元组

data = ("nginx","httpd",["redis","mongodb"])

data[-1][0] = "memcached"

print(data)

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