python学习笔记 loop&&raw_input 7&& if

1.首先要说range(x) 

其返回的是一个list:[0,1,2,....x-1]

>>> range(5)

[0,1,2,3,4]

 

2.Loop 共有两种形式，一种for x in []/(), 一种while ***:

 1 sum = 0;
 2 for x in range(101):
 3     sum += x
 4 print sum
 5 
 6 n = 99
 7 sum = 0
 8 while n > 0:
 9     sum += n
10     n -= 2
11 print sum

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