import random

from math import sqrt

sum = 0

for x in range(101):

sum += x

print(sum)

'''

range(101) 0-100 一共101个数

range(1,101) 1-100

range(1,101,2) 1-100间的奇数 步长为2

range(100,0,-2) 100-0间的偶数 步长为-2

'''

sum = 0

for x in range(100, 0, -2):

sum += x

print(sum)

# while

# 0-100间的随机数

answer = random.randint(0, 100)

count = 0

while True:

count += 1

number = int(input("Please enter the number: "))

if number < answer:

print("more larger")

elif number > answer:

print("more smaller")

else:

print("right")

print('you got d% times to get right answer' % count)

for i in range(1, 10):

for j in range(1, i + 1):

print('%d*%d=%d' % (i, j, i * j), end='\t')

print()

# 输入一个正整数判断是不是素数

num = int(input('请输入一个正整数: '))

end = int(sqrt(num))

is_prime = True

# 为什么要放一个end 如果这个数有一个小于sqrt的因数

# 就一定会有一个大于sqrt的因数与之对应

for x in range(2, end + 1):

if num % x == 0:

is_prime = False

break

if is_prime and num != 1:

print('%d是素数' % num)

else:

print('%d不是素数' % num)