简单的Python小程序

1.打印数字1-10到屏幕

#!/usr/bin/env python
#print 1-10
i = 1
while i<=10:
    print i
    i += 1
print('--------------------')
j = 1
while j<=10:
    print j,
    j += 1

2.求1-100的和

#!/usr/bin/env python
#sum 1-100
num = 1
total = 0
while num<=100:
    total += num
    num += 1
print(total)

3.求1-100的奇数和

#!/usr/bin/env python
#odd number sum 1-100 
num = 1
total = 0
while num<=100:
    total += num
    num += 2
print(total)

4.求1-100的偶数和

#!/usr/bin/env python
#even number sum 1-100
num = 2
total = 0
while num<=100:
    total += num
    num += 2
print(total)

5.打印1-100的奇数到屏幕上

#!/usr/bin/env python
#print odd number 1-100
num = 1
while num<=100:
    print num
    num += 2

6.打印1-100的偶数到屏幕上

#!/usr/bin/env python
#print even number 1-100
num = 2
while num<=100:
    print num
    num += 2

7.求1-2+3-4+5...99的和

#!/usr/bin/env python
#sum 1-2+3-4+5...99
num = 0
for i in range(100):
    if i % 2 == 0:
        num = num -i
    else:
        num = num + i
print num