# 1.字符串反转保留空格 例如：I Love China! => China! Love I
def fanzhuan(s1):
arr = s1.split(" ")
num = 0
for a in range(0,int(len(arr)/2)):
ex = len(arr)-a-1
num = arr[a]
arr[a] = arr[ex]
arr[ex] = num
print(arr)
fanzhuan("I Love China! fuck the tommory asd !!")
# 2.打印100000以内的所有素数
a = 10000
arr = []
for i in range(2,10001):
arr.append(i)
for i in range(0,10001):
for j in range(2,i):
if (i%j == 0 and i!=j):
arr.remove(i)
break
print(arr)