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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