Python对数组的基本操作

# coding=utf-8
"""
Created on 2014-3-29


@author: Administrator
"""
"""
创建并打印数组
"""
arr = ["aex", "bfe", "mpilgrim", "zddd", "example"];
print(arr);#["aex", "bfe", "mpilgrim", "zddd", "example"]
print(arr[2]);#mpilgrim
"""
数组的负索引
li[-n] == li[len(li) - n]
"""
print(arr[-1]);#example
"""
数组的分片
arr[1:3]表示从第一个元素开始，直到但不包含第三个元素
"""
print(arr[1:3]);#["bfe", "mpilgrim"]
"""
向数组中添加元素
"""
arr.append("new");
print(arr);#["aex", "bfe", "mpilgrim", "zddd", "example", "new"]
arr.insert(2, "new");
print(arr);#["aex", "bfe", "new", "mpilgrim", "zddd", "example", "new"]
arr.extend(["gete","sdwz","wettt"]);
print(arr);#["aex", "bfe", "new", "mpilgrim", "zddd", "example", "new", "gete", "sdwz", "wettt"]
"""
在数组中搜索元素
"""
print(arr.index("example"));#5


#print(arr.index("f"));#ValueError: "f" is not in list
print("example" in arr);#True
"""
删除数组中的元素
remove是删除元素的首次出现，pop是删除最后一个元素，并且返回最后一个元素
"""
arr.remove("new");
print(arr);#["aex", "bfe", "mpilgrim", "zddd", "example", "new", "gete", "sdwz", "wettt"]
print(arr.pop());#wettt
print(arr);#["aex", "bfe", "mpilgrim", "zddd", "example", "new", "gete", "sdwz"]
"""
在数组中使用运算符
arr = [1, 2] * 3 等同于 arr = [1, 2] + [1, 2] + [1, 2]
"""
arr=arr+["fegrc","getrvs"];
print(arr);#["aex", "bfe", "mpilgrim", "zddd", "example", "new", "gete", "sdwz", "fegrc", "getrvs"]
arr+=["two"];
print(arr);#["aex", "bfe", "mpilgrim", "zddd", "example", "new", "gete", "sdwz", "fegrc", "getrvs", "two"]
arr1=["dfd","hrh"];
print(arr1*3);#["dfd", "hrh", "dfd", "hrh", "dfd", "hrh"]
arr2=[3,4];
print(arr2*3);#[3, 4, 3, 4, 3, 4] 阅读更多