Python小知识备忘录

来源：互联网发布：天刀捏脸数据存多个编辑：程序博客网时间：2024/05/11 05:00

1. python中的优先权队列，priorityqueue用法：数字越小，表示优先级越高，越早被拿出

from queue import Queuefrom queue import PriorityQueueprioqueue=PriorityQueue()prioqueue.put((1,'hahaha'))  prioqueue.put((5,'ustc'))prioqueue.put((2,'nwsuaf'))prioqueue.put((3,'tsinghua'))prioqueue.put((6,'peking'))prioqueue.put((4,'zhejiang'))while prioqueue:    print (prioqueue.get_nowait())

2 . matplotlib画图，显示各种颜色，在对应位置上画上函数值，控制坐标轴范围，在图上写字

import pylab as plimport matplotlibx=[10,20,11,12,15,25]y=[3,6,9,8,7,4]co=[1,2,3,4,5,6]fig1=pl.figure()cm=pl.get_cmap("RdYlGn")for i in range(0,len(x)):    pl.plot(x[i],y[i],'o',color=cm(co[i]*1.0/6))    pl.text(x[i],y[i],str(y[i])+'*',color='red')pl.xlim(0,45)pl.title('cluster graph ')pl.show()

3. 下载安装easy_install:

from urllib import urlopendata = urlopen('http://peak.telecommunity.com/dist/ez_setup.py')open('ez_setup.py','wb').write(data.read())exitpython ez_setup.py

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