day07--作业

1、打印99乘法口诀表

#!/usr/bin/env python
#-*- coding:utf-8 -*-

def main():
    for i in range(1,10):
        for j in range(1,i+1):
            print('{}*{}={:<3}'.format(j,i,(j*i)),end=' ')
        print('
')

if __name__ == '__main__':
    main()

2、for循环嵌套打印金字塔

实现正向打印和反向打印

#!/usr/bin/env python
#-*- coding:utf-8 -*-

import argparse

class Pyramid:
    def __init__(self,row,dire):
        self.row = row
        self.dire = dire

    def run(self):
        str_base = "*"
        str_none = " "
        if self.dire.lower() == 'p':
            for i in range(1,self.row+1):
                str_obj = (self.row-i)*str_none + (2*i-1)*str_base + (self.row-i)*str_none
                print(str_obj)
        elif self.dire.lower() == 'n':
            for j in range(1,self.row+1):
                str_obj = (j-1)*str_none + (2*self.row-2*j+1)*str_base + (j-1)*str_none
                print(str_obj)

if __name__ == '__main__':
    parser = argparse.ArgumentParser(description = 'Print the pyramid!')
    parser.add_argument('--row', action='store', dest='row', type=int, required=True, help='The row number to print pyramid')
    parser.add_argument('--dire', action='store', dest='dire', choices=['p','P','n','N'], required=True, help='Choose positive(p) or negative(n)')
    args = parser.parse_args()
    p = Pyramid(args.row,args.dire)
    p.run()

3、使用for+range实现用户登录失败3次退出程序

#!/usr/bin/env python
#-*- coding:utf-8 -*-

def main():
    user_dict = {'egon':'vip66','tank':'ccc123'}
    for i in range(3):
        name_of_user = input('请输入用户名:').strip()
        passwd_of_user = input('请输入密码:').strip()
        if name_of_user in user_dict.keys() and passwd_of_user == user_dict.get(name_of_user):
            print('登录成功！')
            break
    else:
        print('用户名或密码输错3次！退出')

if __name__ == '__main__':
    main()

4、字符串操作

#!/usr/bin/env python
#-*- coding:utf-8 -*-

def main():
    name = ' aleX'
    print(name.strip())
    print(name.startswith('al'))
    print(name.endswith('X'))
    print(name.replace('l','p'))
    print(name.split('l'))
    print(name.lower())
    print(name.upper())
    print(name[1])
    print(name[0:3:1])
    print(name[-2:])
    print(name.find('e'))
    print(name[:-1])

if __name__ == '__main__':
    main()

[root@Kingstar day07]# python practice_4.py 
aleX
False
True
 apeX
[' a', 'eX']
 alex
 ALEX
a
 al
eX
3
 ale