循环是根据条件进行跳出。

当条件永远为真时，也就是死循环。

死循环
这里True，代表1是真，0是假
i = 0
while True:
i = i + 1
if i == 50:

 print 'I have got to the round 50th!'
 continue

if i>70:break
print i

死循环
i = 0
while True:
i = i + 1
if i == 5000000:

 print 'I have got to the round 50th!'
 break

if i>70:break

print i

两种方法打印10000000
方法一
i = 0
while i< 10000000:

 i = i + 1
 continue

print 'I have got to the round',i

break

if i>70:break

print

方法二：
程序走完才走else，不然不走else
i = 0
while i< 10000000:

 i = i + 1

continue

else:

  print 'I have got to the round',i

break

if i>70:break

print i

while和for循环对比（一个道理）
i = 0
while i< 10000000:

 i = i + 1

continue

else:

  print 'I have got to the round',i

break

if i>70:break

print i

for i in range(100):

print i

else:

print 'The loop is done!'