Pyton 练习题2

#显示跑马灯文字
import os
import time
def main():
    content = str(input('输入显示内容：'))
    while True:
        os.system('cls')
        print(content)
        time.sleep(0.2)
        content = content[1:] + content[0]
main()

#产生验证码
import random
def generate_code(code_len=4):
    all_char = '1234567890qwertyuiopasdfghjklmnbvcxzQWERTYUIOPLKJHGFDSAZXCVBNM'
    longs = len(all_char) - 1
    code = ' '
    for i in range(code_len):
        index = random.randint(0,longs)
        code += all_char[index]
    return code
print(generate_code())

#返回文件后缀名(不好理解)
def get_file(filename,dot=False):
    pos = filename.rfind('.')
    print(pos)
    if 0 < pos < len(filename) - 1:
        index = pos if dot else pos + 1
        return filename[index:]
    else:
        return ' '
print(get_file('ddd.py'))

#列表最大的两个数
def max(*lists):
    longs = len(lists)
    a = 0
    b = 0
    d=[]
    for i in range(0,longs):
        if lists[i] >=a:
            a =  lists[i]
    for f in lists:
        d.append(f)
    d.remove(a)
    for x in range(0,longs-1):
        if d[x] >=b:
            b =  d[x]
    return a,b
print(max(1,4,6,7,34,66,6))

#根据年月日确定是第几天
def is_leap_year(year):
   
    return year % 4 == 0 and year % 100 != 0 or year % 400 == 0


def which_day(year, month, date):
  
   
    days_of_month = [
        [31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31],
        [31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]
    ][is_leap_year(year)]
    total = 0
    for index in range(month - 1):
        total += days_of_month[index]
    return total + date


def main():
    print(which_day(1980, 11, 28))
    print(which_day(1981, 12, 31))
    print(which_day(2018, 1, 1))
    print(which_day(2016, 3, 1))


if __name__ == '__main__':
    main()

#杨辉三角
def yanghui():
    num= int(input('输入打印多少行：'))
    yh = [[]]*num   #准备num个二阶数组
    for row in range(len(yh)):   #打印num行的数据
        yh[row] = [None] * (row + 1)   #每一行显示的个数
        for col in range(len(yh[row])):  #打印每一行数据 
            if col == 0 or col == row:     #第一列和索引相同处赋值为1
                yh[row][col] = 1
            else:                           #其他位置的值等于左上方的值加上正上方的值
                yh[row][col] = yh[row-1][col] + yh[row-1][col-1]
            print(yh[row][col], end = '\t')   
        print()

print(yanghui())

#机选双色球
from random import randrange, randint, sample
def function2(row):
    for a, ball in enumerate(row):  #循环索引和数值
        if a == len(row) - 1:
            print('|', end = ' ')  #最后一位和前六位区分开
        print('%02d' % ball, end=' ') #打印每位数值，不够2位用0表示
    print()
def function1():
    fw = [x for x in range(1, 34)] #定义取值区间
    qian = []
    qian = sample(fw, 6)   #在区间内随机选取六个数
    qian.sort()
    qian.append(randint(1,16))  #随机选取确定最后一位数
    return qian
def main():
    number = int(input('机选几注：'))
    for _ in range(number):
        function2(function1())
print(main())

#正则表达式(提取电话号码)
import re
def main():
    pattern = re.compile(r'(?<=\D)1[34578]\d{9}(?=\D)')
    sentence = '''
    通过学校3450054452975次的调查，\
    发现5月28日号码13784932456\
    给号码15875349204发过短信17438904720
    '''
    mylist = re.findall(pattern,sentence)
    print(mylist)
    for temp in pattern.finditer(sentence):
        print(temp.group())
    m = pattern.search(sentence)
    while m:
        print(m.group())
if __name__ == '__main__':
    main()