1. 求1-100的和

[root@web sbin]# cat task1.py #!/usr/bin/env pythonsum = 0for i in xrange(1, 101):    sum += iprint sum[root@web sbin]# python task1.py 5050

 

2. 求1-500所有奇数的和

[root@web sbin]# cat task2.py #!/usr/bin/env pythonsum = 0for i in xrange(1, 501):    if i % 2 != 0:        sum += iprint sum[root@web sbin]# python task2.py 62500

 

3. 求1 + 2! + 3! + .... + 20!

[root@web sbin]# cat task3.py   #!/usr/bin/env pythondef fact(n):    sum = 1    for i in xrange(1, n+1):        sum *= i    return sumif __name__ == '__main__':    a = 0    for i in xrange(1, 21):        a += fact(i)    print a[root@web sbin]# python task3.py2561327494111820313

 

4.  给列表做排序

In [1]: l = [2,32,43,453,54,6,576,5,7,6,8,78,7,89]In [2]: l.sort()         //正序排序In [3]: lOut[3]: [2, 5, 6, 6, 7, 7, 8, 32, 43, 54, 78, 89, 453, 576] In [4]: l.reverse()          //反序排序In [5]: lOut[5]: [576, 453, 89, 78, 54, 43, 32, 8, 7, 7, 6, 6, 5, 2]