详解Python的循环结构知识点

用for循环实现1~100求和

Version: 0.1
Author: 骆昊
"""

sum = 0
for x in range(101):
  sum += x
print(sum)

用for循环实现1~100之间的偶数求和

Version: 0.1
Author: 骆昊
"""

sum = 0
for x in range(2, 101, 2):
  sum += x
print(sum)

用for循环实现1~100之间的偶数求和

Version: 0.1
Author: 骆昊
"""

sum = 0
for x in range(1, 101):
  if x % 2 == 0:
    sum += x
print(sum)

猜数字游戏
计算机出一个1~100之间的随机数由人来猜
计算机根据人猜的数字分别给出提示大一点/小一点/猜对了

Version: 0.1
Author: 骆昊
"""

import random

answer = random.randint(1, 100)
counter = 0
while True:
  counter += 1
  number = int(input('请输入: '))
  if number < answer:
    print('大一点')
  elif number > answer:
    print('小一点')
  else:
    print('恭喜你猜对了!')
    break
print('你总共猜了%d次' % counter)
if counter > 7:
  print('你的智商余额明显不足')

输出乘法口诀表(九九表)

Version: 0.1
Author: 骆昊
"""

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它是不是素数

Version: 0.1
Author: 骆昊
Date: 2018-03-01
"""
from math import sqrt

num = int(input('请输入一个正整数: '))
end = int(sqrt(num))
is_prime = True
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)

输入两个正整数计算最大公约数和最小公倍数

Version: 0.1
Author: 骆昊
Date: 2018-03-01
"""

x = int(input('x = '))
y = int(input('y = '))
if x > y:
  x, y = y, x
for factor in range(x, 0, -1):
  if x % factor == 0 and y % factor == 0:
    print('%d和%d的最大公约数是%d' % (x, y, factor))
    print('%d和%d的最小公倍数是%d' % (x, y, x * y // factor))
    break

打印各种三角形图案

*
**
***
****
*****

  *
  **
 ***
 ****
*****

  *
  ***
 *****
 *******
*********

Version: 0.1
Author: 骆昊
"""

row = int(input('请输入行数: '))
for i in range(row):
  for _ in range(i + 1):
    print('*', end='')
  print()


for i in range(row):
  for j in range(row):
    if j < row - i - 1:
      print(' ', end='')
    else:
      print('*', end='')
  print()

for i in range(row):
  for _ in range(row - i - 1):
    print(' ', end='')
  for _ in range(2 * i + 1):
    print('*', end='')
  print()