Day08 学习笔记

输入与类型

• 使用 input() 接收键盘输入，并保留原有数据类型；打印其值与类型便于观察：

# input.py
c = input("请输入：")
print c
print type(c)

线程基础（thread 模块）

• 通过 thread.start_new_thread(func, args) 启动轻量线程；主线程可 sleep 等待子线程执行完毕：

import thread
import time

def loop1():
    print "loop1 up:", time.ctime()
    time.sleep(6)
    print "loop1 down:", time.ctime()

def loop2():
    print "loop2 up:", time.ctime()
    time.sleep(3)
    print "loop2 down:", time.ctime()

print "main:", time.ctime()
thread.start_new_thread(loop1, ())
thread.start_new_thread(loop2, ())
time.sleep(10)
print "all down:", time.ctime()

线程继承（threading.Thread）

• 继承 threading.Thread，覆盖 run()，使用 start() 启动、join() 等待：

import threading
import time

class MyThread(threading.Thread):
    def __init__(self, threadID, name, delay):
        threading.Thread.__init__(self)
        self.threadID = threadID
        self.name = name
        self.delay = delay

    def run(self):
        print "starting", self.name
        print_time(self.name, 5, self.delay)
        print "exiting", self.name

def print_time(threadName, count, delay):
    while count:
        time.sleep(delay)
        print "%s : %s" % (threadName, time.ctime())
        count -= 1

t1 = MyThread(1, "Thread-1", 1)
t2 = MyThread(2, "Thread-2", 2)
t1.start()
t2.start()
# t1.join()   # 可选等待 t1
t2.join()      # 等待 t2 结束
print "Exiting Main!!!"

小项目：英汉词典（交互菜单）

• 支持添加与查询单词，使用字典作为存储结构：

class EnglishDictionary:
    def aadd_dic(self, dic):
        try:
            while True:
                word = raw_input("\033[0;31;42mEnter键返回主界面，\033[0m请输入英文单词：")
                if len(word) == 0:
                    break
                meaning = raw_input("请输入中文翻译：")
                dic[word] = meaning
                print "该单词已添加到字典库！！！"
        except Exception, e:
            print e.__str__()

    def search_dic(self, dic):
        try:
            while True:
                word = raw_input("\033[0;31;42mEnter键返回主界面，\033[0m请输入要查询的英文单词：")
                if len(word) == 0:
                    break
                if word in dic:
                    print "%s 的中文翻译是：%s" % (word, dic[word])
                else:
                    print "字典库中未找到这个单词！！！"
        except Exception, e:
            print e.__str__()

def run():
    try:
        worddic = dict()
        xiaohong = EnglishDictionary()
        while True:
            print "请选择功能：\n1:添加 \n2:查询 \n3:退出"
            c = input("请输入要执行的代号：")
            if c == 1:
                xiaohong.aadd_dic(worddic)
            elif c == 2:
                xiaohong.search_dic(worddic)
            elif c == 3:
                break
            else:
                print "输入错误！！！"
    except Exception, e:
        print e.__str__()

if __name__ == "__main__":
    run()