Python is beautiful

#20以内奇数的和
print(sum([i for i in range(21) if i%2 !=0]))

#一个整数的两个连续整数和
def f(a):
	for i in range(a+1):
		for j in range(a+1-i):
			if i+j==a and (i-j==1 or i-j==-1):
				print(i,j)