Python 知识点练习

#函数应用：计算两个正数的最大公约数和最小公倍数
def function1(n1,n2):
    if n1 > n2:
        n1 , n2 = n2 , n1
    for i in range(n1,0,-1):
        if n1 % i == 0 and n2 % i == 0:
            return i
def function2(n1,n2):
    return n1*n2//function1(n1,n2)

#函数应用：判断是否为素数
def sushu(number):
    a = 2
    for i in range(2 , number - 1):
        if number % i == 0 :
            a = 1
    if a == 1:
        return False
    else:
        return True
#运用
s1 = 'hello ' * 4
s2 = 'hello,world'
print(len(s1),s2.title(),s1.upper())
print(s1.index('lo'))
print('{0} * {1} = {2}'.format(s1,s2,s1 + s2))

#列表
list1 = [3,4,5,6,7,88,90]
print(list1)
a = list1[3:5]
b = list1[2]
print(a,b)
for x in range(len(list1)):
    print(list1[x])
for index, elem in enumerate(list1):
    print(index,elem)
list1.append(b)
list1.insert(4,20)
print(list1)
list2 = ['sdf','alte','cllect','fast','baby']
list3 = sorted(list2)
list4 = list2.sort(reverse = True)
print(list2,'
',list3,'
',list4)

#生成器
import sys
list1= [x for x in range(1,10)]
print(list1)
print(sys.getsizeof(list1))

#元组
import sys
list1 = ('cmd',5,'贵州遵义')
print(list1,sys.getsizeof(list1))

#集合不存在重复性
set1 = {1, 4, 23, 55, 43,4}
print(set1)
print('lenth:', len(set1))
set1.add(88)
set1.update([5,7])
set1.discard(4)
set1.remove(1)
print(set1)
set2 = set(range(0,5))
print(set2)
print(set1 & set2)
print(set1 | set2)
print(set1 - set2)
print(set1 <= set2)
print(set1 ^ set2)

#字典
scores = dict(a = 1, b = 3, c = 6)
scores1 = {'gz':20,'sc':66,'zy':3}
print(scores)
print(scores1)
cs = scores1['gz']
print(cs)
for key in scores:
    print(key,scores[key])

#类
class studengt(object):
    def __init__(self, name,age):
        self.name = name
        self.age = age
    def study(self, discipline):
        print('%s正在学习%s。'%(self.name, discipline))
    def whatch(self):
        if self.age < 18:
            print('%s正在看 熊出没' %self.name)
        else:
            print('%s正在看 迪迦.'%self.name)
def studengt1():
    stu1 = studengt('wgy', 23)
    stu1.whatch()
    stu1.study('zgggS')

print(studengt1())

from time import sleep
class day():
    def __init__(self, hour = 0, minute = 0, second = 0):
        self.hour = hour
        self.minute = minute
        self.second = second
    def cycle(self):
        self.second += 1
        if self.second == 60:
            self.second = 0
            self.minute += 1
            if self.minute == 60:
                self.minute = 1
                self.hour += 0
                if self.hour == 24:
                    self.hour = 0
    def disply (self):
        print('%02d : %02d : %02d' %(self.hour, self.minute, self.second))

def main():
    time = day(12,33,44)
    while True:
        day.disply( time)
        sleep(1)
        day.cycle(time)
if __name__ == '__main__':
    main()

#正则表达式(qq，用户名)
import re
#调用正则表达式模块re
def main():
    user_name = input('请输入用户名：')
    qq_number = input('请输入qq号：')
    m1 = re.match(r'^[0-9a-zA-Z]{6,20}$', user_name) #判断格式是否符合
    m2 = re.match(r'^[1-9]d{4,11}', qq_number)
    if not m1:
        print('用户名不存在')
    if not m2:
        print('qq不存在')
    if m1 and m2:
        print('格式正确')

print(main())

#多进程实现文件下载
from multiprocessing import Process 
#linux用os模块fork()函数创建进程
#Windows用multiprocessing模块中的Process类创建进程
from os import getpid 
#返回进程号
from random import randint
from time import time, sleep
def downlode(filename):
    print('启动下载程序，进程号%s' % getpid)
    print('开始下载%s...' %filename)
    downlode_time = randint(5,10)
    sleep(downlode_time)
    print('%s下载完成！耗费%d秒' %(filename, downlode_time))

def main():
    start = time() #开始计时
    m1 = Process(target = downlode, args = ('python从零开始.ptf', ))
    #Process类创建了进程对象，通过target参数我们传入一个函数来表示进程启动后要执行的代码，后面的args是一个元组，它代表了传递给函数的参数。
    m1.start()
    m2 = Process(target= downlode, args = ('python的多进程.ptf', ))
    m2.start()
    #start方法用来启动进程
    m1.join()
    #join方法表示等待进程执行结束
    m2.join()
    end = time() #结束计时
    print('总共耗费了%.2f秒' %(end - start))

if __name__ == '__main__':
    main()

#多进程实现文件下载
from threading import Thread
from random import randint
from time import time, sleep
def download(filename):
    print('%s文件开始下载....' %filename)
    time_filename = randint(5, 12)
    sleep(time_filename)
    print('%s下载结束，下载花费%d秒' %(filename, time_filename))
def main():
    start = time()
    m1 = Thread(target = download, args = ('python从零开始.ptf', ))
    m1.start()
    m2 = Thread(target = download, args=('pytn的多线程应用.pdf', ))
    m2.start()
    m1.join()
    m2.join()
    end = time()
    print('总耗费%d秒.' %(start - end))
if __name__ == '__main__':
    main()

#API的调用
from time import time
from threading import Thread
import requests
class daygas():
    def __init__(self, url):
        self.url = url

    def run(self):
        resp = requests.get(self.url)
        with open(daygas.json,'w') as f:
            f.write(resp)
def main():
    resp = requests.get('http://api.tianapi.com/txapi/tianqi/index')
    for x in resp:
        url = x
        daygas(url)

if __name__ == '__main__':
    main()

#操作图像
from PIL import Image
image = Image.open('C:/Users/ASUS/Pictures/Saved Pictures/1.jpg')
print(image.format, image.size, image.mode)
image.show()
rect = 60, 30, 330, 340
image.crop(rect).show()