Python之--while练习_python while语句练习

"""
1.随机生成10以内加法题目
2.学生查看题目并输入答案
3.判断学生答案是否正确
4.退出时，统计答题目总数，并统计正确数量和正确率(保留两位小数)

"""
import random

a = ['+','-','*','/']
s = random.choice(a)
print(s)


# 导入生成随机数的模块
import random

# 定义用来记录回答正确的题数和总的题数
right = 0
counts = 0

# 无限循环
while True:
    # 生成0-10的随机数
    a = random.randint(0,10)
    b = random.randint(0,10)
    #  输出题目
    print('%d + %d =' %(a,b))
    # 接收用户输入的答案
    question = input('请输入您的答案(q退出): ')
    # 计算正确答案
    result = a + b
    # 判断答案是否正确
    if question == str(result):
        print('回答正确')
        right += 1
        counts += 1
    # break表示退出当前循环
    elif question == 'q':
        break
    else:
        print('回答错误')
        # 回答正确的题数与回答错误的题数之和便是总的答题数目
        counts += 1
# 计算正确率(除数不能为0)
if counts == 0:
    percent = 0
else:
    percent = right / counts
    # 两个%%表示一个%
print ('测试结束,共回答%d道题,正确个数为%d,正确率为:%.2f%%' %(counts,right,percent*100))
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"""
1.随机生成1～100的数字
2.5次机会
3.too big
4.too small
5.恭喜，并退出循环
"""
import random      			##随机选出一个数

trycount = 0				
computer = random.randint(1,100)	##在1～100之间
print(computer)

while trycount < 5:			##控制最大循环次数为5次
    player = int(input('Num: '))
    if player > computer:
        print('too big')
        trycount += 1			##控制循环
    elif player < computer:
        print('too small')
        trycount += 1
    else:
        print('恭喜')
        break
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#for i in range(3):
trycount = 0

while trycount < 3:        ##用while语句实现三次循环
    name = input('用户名: ')
    passwd = input('密码: ')
    if name == 'root' and passwd == 'westos':
        print('登录成功！')
        break
    else:
        print('登录失败')
        print('您还剩余%d次机会' %(2-trycount))
        trycount += 1
else:
    print('失败超过3次，请稍后再试！')
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输出给定图案    

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

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

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

*****
 ****
  ***
   **
    *
"""
row = 1

while row <= 5:         ##行数
    col = 1		##列数
    while col <= row:	##while循环实现递加
        print('*',end='')
        col += 1
    print('')		##空行
    row += 1
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"""
输出九九乘法表
1 * 1 = 1
1 * 2 = 2  2 * 2 = 4
1 * 3 = 3  2 * 3 = 6  3 * 3 = 9
"""

row = 1

while row <= 9:
    col = 1
    while col <= row:
        print('%d * %d = %d\t' %(row,col,col*row),end='')
        col += 1
    print('')
    row += 1
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