#!/usr/bin/python
i=10
n=0
while i>0:
    n=n+i
    i=i-2
print n

1 #!/usr/bin/env python
 2 # readline() 
 3
 4 inp=open("NEWS.txt","r")
 5 count=0
 6
 7 while 1:
 8     line = inp.readline()
 9     print line
10     count=count+1
11     while count == 25:
12         name = raw_input("按a继续:  ")
13         if name == 'a':
14             count = 0
15         else:
16             continue
17
18     if len(line) == 0:
19         break
20
21 inp.close()

22 version = 0.1

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


for i in range(1,10):
    for n in range(1,i):
        print"%2dx%2d=%2d|" % (i,n,i*n),
    print "\n"+"-"*50

# 将列表L每隔十个值分成一个列表
# 我的
x = []
n = 0
if L:
    x.append(L[n:n + 10]
    n  += 10 
# 依云(百合仙子)的解法，高低立下  - __ -
import math
r = [L[i:i+10] for i in range(math.ceil(len(L)/10))]

Question #13: What gets printed?
56% on 780 times asked

x = True
y = False
z = False

if not x or y:
    print 1
elif not x or not y and z:
    print 2
elif not x or y or not y and x:
    print 3
else:
    print 4

NOT has first precedence, then AND, then OR