Python3.x 基础练习题100例(91-100)

练习91:

题目:
时间函数举例1。

程序:

if __name__ == '__main__':
    import time
    print (time.ctime(time.time()))
    print (time.asctime(time.localtime(time.time())))
    print (time.asctime(time.gmtime(time.time())))

输出结果:

Sat Mar 23 19:37:22 2019
Sat Mar 23 19:37:22 2019
Sat Mar 23 11:37:22 2019

练习92:

题目:
时间函数举例2。

程序:

if __name__ == '__main__':
    import time

    start = time.time()
    for i in range(3000):
        print(i)
    end = time.time()
   
    print(end - start)

输出结果:

0
1
2
。
。
。
2997
2998
2999
0.02006244659423828

练习93:

题目:
时间函数举例3。

程序:

if __name__ == '__main__':
    import time

    start = time.time()
    for i in range(10000):
        print(i)
    end = time.time()
    print('different is %6.3f' % (end - start))

输出结果:

0
1
2
3
。
。
。
9996
9997
9998
9999
different is  0.059

练习94:

题目:
时间函数举例4,一个猜数游戏,判断一个人反应快慢。

程序:

if __name__ == '__main__':
    import time
    import random

    play_it = input('do you want to play it.(\'y\' or \'n\')')
    while play_it == 'y':
        c = input('input a character:\n')
        i = random.randint(0, 2 ** 32) % 100
        print('please input number you guess:')
        start = time.time()
        a = time.time()
        guess = int(input('input your guess:'))
        while guess != i:
            if guess > i:
                print('please input a little smaller')
   
                guess = int(input('input your guess:'))
            else:
                print('please input a little bigger')
   
                guess = int(input('input your guess:'))
        end = time.time()
        b = time.time()
        var = (end - start) / 18.2
        print(var)
   
        # print 'It took you %6.3 seconds' % time.difftime(b,a))
   
        if var < 15:
            print('you are very clever!')
        elif var < 25:
            print('you are normal!')
   
        else:
            print('you are stupid!')
   
        print('Congradulations')
   
        print('The number you guess is %d' % i)
   
        play_it = input('do you want to play it.')

练习95:

题目:
字符串日期转换为易读的日期格式。

程序:

from dateutil import parser
dt = parser.parse("Aug 28 2015 12:00AM")
print (dt)

练习96:

题目:
计算字符串中子串出现的次数。

程序:

if __name__ == '__main__':
    str1 = input('请输入一个字符串:')
    str2 = input('请输入一个子字符串:')
    ncount = str1.count(str2)
    print(ncount)

输出结果:

请输入一个字符串:qwery gdfdaabbbcccabc
请输入一个子字符串:a
3

练习97:

题目:
从键盘输入一些字符,逐个把它们写到磁盘文件上,直到输入一个 # 为止。

程序:

if __name__ == '__main__':
    filename = input('输入文件名:')
    fp = open(filename,"w")
    ch = input('输入字符串:')
    while ch != '#':
        fp.write(ch)
        print(ch)
        ch = input('')
    fp.close()

练习98:

题目:
从键盘输入一个字符串,将小写字母全部转换成大写字母,然后输出到一个磁盘文件"test"中保存。

程序:

if __name__ == '__main__':
    fp = open('test.txt','w')
    string = input('please input a string:\n')
    string = string.upper()
    fp.write(string)
    fp = open('test.txt','r')
    print (fp.read())
    fp.close()

练习99:

题目:
有两个磁盘文件A和B,各存放一行字母,要求把这两个文件中的信息合并(按字母顺序排列), 输出到一个新文件C中。

程序:

if __name__ == '__main__':
    import string

    fp = open('text1.txt')
    a = fp.read()
    fp.close()
   
    fp = open('text2.txt')
    b = fp.read()
    fp.close()
   
    fp = open('text3.txt', 'w')
    l = list(a + b)
    l.sort()
    s = ''
    s = s.join(l)
    fp.write(s)
    fp.close()

练习100:

题目:
列表转换为字典。

程序:

i = ['a', 'b']
l = [1, 2]
print(dict([i, l]))

输出结果:

{'a': 'b', 1: 2}
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