Python 元组(Tuple)

一. 元组(Tuple)的基本概念

Python的元组与列表类似，不同之处在于元组的元素不能修改，Tuple使用小括号()。

tupleA = tupleB = (1, 2, 3, 4)  # 数字Tuple
tupleC = (tupleA, '21yi.com', 1, 2, 3)  # 混合Tuple
tupleD = (1,)  # 只有一个元素时，需要有逗号结尾

二. 元组(Tuple)的更新、删除、读取、截取

tupleA = tupleB = (1, 2, 3, 4)  # 数字Tuple
tupleC = (tupleA, '21yi.com', 1, 2, 3)  # 混合Tuple
tupleD = ("a",)  # 只有一个元素时，需要有逗号结尾
# tupleC[1] = "update"  # Tuple不允许修改更新或二次赋值 Tuples don't support item assignment
print(tupleA[-1])  # 返回4
print(tupleC[2:4])  # 返回(1, 2)
print(tupleC[-1:])  # 返回(3,)
print(tupleA + tupleD)  # 返回(1, 2, 3, 4, 'a')
del tupleA  # 删除整个Tuple

三. 元组(Tuple)运算符

print(len(("x", "y", "x")))

print((1, 2) + ("a",))

print(("21yi",) * 3)

print(3 in ("21yi",))

for i in ("Hello", ",", "21yi"):
    print(i)

四.元组(Tuple)内置函数

Python元组包含了以下内置函数