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example90.py
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34 lines (30 loc) · 781 Bytes
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# -*- coding:utf-8 -*-
__author__ = 'gjw'
__time__ = '2018/1/11 0011 下午 1:59'
# 题目：列表使用实例。
# list
# 新建列表
testList = [10086, '中国移动', [1, 2, 4, 5]]
# 访问列表长度
print(len(testList))
# 到列表结尾
print(testList[1:])
# 向列表添加元素
testList.append('i\'m new here!')
print(len(testList))
print(testList[-1])
# 弹出列表的最后一个元素
print(testList.pop(1))
print(len(testList))
print(testList)
# list comprehension
# 后面有介绍，暂时掠过
matrix = [[1, 2, 3],
[4, 5, 6],
[7, 8, 9]]
print(matrix)
print(matrix[1])
col2 = [row[1] for row in matrix] # get a column from a matrix
print(col2)
col2even = [row[1] for row in matrix if row[1] % 2 == 0] # filter odd item
print(col2even)