if __name__ == '__main__':
 a = ''
 b = 'True'
 c = 'False'
 
 #方法一：为真时的结果 if 判定条件 else 为假时的结果
 d = b if a else c
 print('方法一输出结果：' + d)
 
 #方法二：判定条件 and 为真时的结果 or 为假时的结果
 d = a and b or c
 print('方法二输出结果：' + d)
 
 #以上两种方法方法等同于if ... else ...
 if a:
  d = b
 else:
  d = c
 print('if语句的输出结果：' + d)

x = [x for x in range(1,10)]
print(x)
y =[]

result = True if 12 not in x else False # this is the best way
print(result)
result = True if not 12 in x else False # this way just like as " (not 12) in x"
print(result)

print(x is y)
print(x is not y) # this is the best way
print(not x is y) # this way just like as " (not x ) is y" ,so upper is the best way

result = 2 if 1 < 2 else 5 if 4 > 5 else 6 # just as 1 > 2 ? 2 : 4 > 5 ? 5 : 6
print(result)

name=''
while not name:
 name=raw_input(u'请输入姓名:')
print name

a = False
if not a: (这里因为a是False，所以not a就是True)
 print "hello"

a = 5
b = [1, 2, 3]
if a not in b:
 print "hello"

>>> x = 1
>>> not x
False
>>> x = [1]
>>> not x
False
>>> x = 0
>>> not x
True
>>> x = [0]   # You don't want to fall in this one.
>>> not x
False