Python练习题（1）

1 a = 0
2 while a < 10:
3     a = a + 1
4     if a == 7:
5         pass
6     else:
7         print(a)

1 a = 0
2 b = 0
3 while a < 100:
4     a = a + 1     #每循环一次,a会自动加一
5     b = b + a     #每次循环b会记录当前a的值，并与a相加
6 print(b)

1 a = 0
2 while a < 100:
3     a = a +1
4     if a % 2 == 0:   #如果除2求于等于0
5         pass              #pass占位，什么都不做
6     else:                  #否则输出奇数
7         print(a)

1 a = 0
2 while a < 100:
3     a = a +1
4     if a % 2 == 0:
5         print(a)

 1 # -*- coding:utf-8 -*-
 2 #求1-2+3-4+5...99的所有数的和
 3 ‘‘‘
 4 找规律奇数是加，偶数是减
 5 ‘‘‘
 6 a = 1
 7 b = 0
 8 while a  <100:
 9     temp = a  % 2
10     if temp ==0:
11         b = b - a
12     else:
13         b = b + a 
14     a += 1
15 print(b)