python集合用法实例分析

yipeiwu_com5年前Python基础

本文实例讲述了python集合用法。分享给大家供大家参考。具体分析如下:

# sets are unordered collections of unique hashable elements
# Python23 tested   vegaseat   09mar2005
# Python v2.4 has sets built in
import sets
print "List the functions within module 'sets':"
for funk in dir(sets):
  print funk
# create an empty set
set1 = set([])
# now load the set
for k in range(10):
  set1.add(k)
print "\nLoaded a set with 0 to 9:"
print set1
set1.add(7)
print "Tried to add another 7, but it was already there:"
print set1
# make a list of fruits as you put them into a basket
basket = ['apple', 'orange', 'apple', 'pear', 'orange', 'banana']
print "\nThe original list of fruits:"
print basket
# create a set from the list, removes the duplicates
fruits = sets.Set(basket)
print "\nThe set is unique, but the order has changed:"
print fruits
# let's get rid of some duplicate words
str1 = "Senator Strom Thurmond dressed as as Tarzan"
print "\nOriginal string:"
print str1
print "A list of the words in the string:"
wrdList1 = str1.split()
print wrdList1
# now create a set of unique words
strSet = sets.Set(wrdList1)
print "The set of the words in the string:"
print strSet
print "Convert set back to string (order has changed!):"
print " ".join(strSet)
print
# comparing two sets, bear with me ...
colorSet1 = sets.Set(['red','green','blue','black','orange','white'])
colorSet2 = sets.Set(['black','maroon','grey','blue'])
print "colorSet1 =", colorSet1
print "colorSet2 =", colorSet2
# same as (colorSet1 - colorSet2)
colorSet3 = colorSet1.difference(colorSet2)
print "\nThese are the colors in colorSet1 that are not in colorSet2:"
print colorSet3
# same as (colorSet1 | colorSet2)
colorSet4 = colorSet1.union(colorSet2)
print "\nThese are the colors appearing in both sets:"
print colorSet4
# same as (colorSet1 ^ colorSet2)
colorSet5 = colorSet1.symmetric_difference(colorSet2)
print "\nThese are the colors in colorSet1 or in colorSet2, but not both:"
print colorSet5
# same as (colorSet1 & colorSet2)
colorSet6 = colorSet1.intersection(colorSet2)
print "\nThese are the colors common to colorSet1 and colorSet2:"
print colorSet6

希望本文所述对大家的Python程序设计有所帮助。

相关文章

python-tornado的接口用swagger进行包装的实例

python-tornado的接口用swagger进行包装的实例

写这个文章的主要原因,就是因为没有相关的东西,导致我完全不知道应该怎么做,经过了两个晚上的摸索,终于搞清楚了,如果有谁需要tornado+swagger的输出模式,可以照这个套; 主要是...

Python基于win32ui模块创建弹出式菜单示例

Python基于win32ui模块创建弹出式菜单示例

本文实例讲述了Python基于win32ui模块创建弹出式菜单。分享给大家供大家参考,具体如下: 一、代码: # -*- coding:utf-8 -*- #! python3 im...

windows10系统中安装python3.x+scrapy教程

windows10系统中安装python3.x+scrapy教程

官网下载就好, https://www.python.org/downloads/release/python-352/ 用installer下载比较方便,它直接把环境变量都帮你配了。...

一行Python代码过滤标点符号等特殊字符

很多时候我们需要过滤掉标点符号等特殊字符,网上虽然有一堆的方法,但是都没有找到一个非常满意的,有些过滤不了中文的标点符号,有些过滤不了英文的标点符号,有些过滤不全。 最后通过查看正则表达...

用django设置session过期时间的方法解析

session的超时时间设置 settings中 SESSION_COOKIE_AGE=60*30 30分钟。 SESSION_EXPIRE_AT_BROWSER_CLOSE...