100个python小示例
示例1.多条件判断
#出题 height #女生找对象 # 男生在1米~1.5米之间 小强 你在哪里? # 男生在1.5~1.7米之间 没有安全感~ # 男生 1.7~ 1.8米之间 帅哥 留个电话 # 男生 1.8~2米之间 帅哥 你建议多一个女朋友吗 while True: print('>>>> 按q退出!') height = (input('请输入你的身高: ')) if height.lower() == 'q': break height = float(height) if 1 <= height < 1.5: print('小强,你在哪里?') elif 1.5 <= height < 1.7: print('没有安全感~') elif 1.7 <= height < 1.8: print('帅哥,留个电话') elif 1.8 <= height < 2: print('帅哥,你建议多一个女朋友吗?') else: print('抱歉,你的身高不在范围内!')
示例2. while 循环
2.通过打印一个变量的形式,展现一行十个小星星? i = 1 strvar = "" while i <=10: strvar += "☆" i += 1 print(strvar)
3.一行十个换色的星星? i = 1 while i <=10: if i % 2 == 0: print('-',end="") else: print('+',end="") i += 1
4.用一个循环打印十行十列小星星? #方法一 # i = 0 # while i<100: # print('*',end="") # if i % 10 ==9: # print() # i += 1 #方法二 i = 1 while i<=100: print('*',end="") if i % 10 ==0: print() i += 1
5.一个循环实现十行十列隔列换色的小星星? i = 0 while i <100: if i % 2 == 0: print('-',end="") else: print('+',end="") if i % 10 == 9: print() i += 1 6.一个循环实现十行十列,隔行换色小星星? i = 0 while i < 100: if i // 10 % 2== 0: print('-',end="") else: print('+',end="") if i % 10 == 9: print() i += 1
示例3. 输入次数计数
times = 1 while times <= 3: pwd = input("请输入您的密码:") if pwd == "111": print("恭喜你登录成功~") break # 剩余次数 = 总次数 - 已经使用的次数 print("你剩余的输入次数是%d" % (3 - times)) times += 1
示例4. while双循环
# 打印10行10列的小星星
j = 0 while j < 10: i = 0 while i < 10: print('*', end='') i += 1
#每打印10个小星星就换行 print() j += 1 ''' 里层的i比外层的j要循环的快,外层的j循环1次,里层的i循环10次,外层循环2次,里层20次...,依次类推 最后10*10次就是100个小星星 '''
10行10列,隔列换色的小星星
i = 0 while i < 10: j = 0 while j < 10: if j % 2 == 0: print('+',end="") else: print('-',end='') j += 1 print() i += 1
10行10列,隔行换色的小星星
i = 0 while i < 10 : j = 0 while j < 10: if i % 2 == 0: print("☆",end="") else: print("★",end="") j +=1 print() i +=1
示例5. 99乘法表
i = 1 while i <= 9: # 打印对应的表达式 j = 1 while j <= i: print("%d*%d=%2d " % (i,j,i*j) ,end="" ) j+=1 # 打印换行 print() i +=1
方法2. for循环99乘法表
for i in range(1,10): for j in range(1,i+1): print("%d*%d=%2d " % (i,j,i*j) ,end="" ) print()
示例6: 百钱买百鸡
# 百钱买百鸡 # 公鸡一个五块钱，母鸡一个三块钱，小鸡三个一块钱，现在要用一百块钱买一百只鸡，问公鸡、母鸡、小鸡各多少只？ """ 穷举法:把数据拿出来一个一个试 x = [1,2] y = [3,4] z = [5,6] x+y+z = 10 1 + 3 + 5 = 9 1 + 3 + 6 = 10 bingo 1 + 4 + 5 = 10 bingo 1 + 4 + 6 = 11 2 + 3 + 5 = 10 bingo 2 + 3 + 6 = 11 2 + 4 + 5 = 11 2 + 4 + 6 = 12 """ """ 公鸡 : x 母鸡 : y 小鸡: z 鸡的数量:x + y + z = 100 鸡的价格:5 * x + 3 * y + 1/3*z = 100 """ x = 0 while x <= 20: y = 0 while y <= 33: z = 0 while z <= 100: if x+y+z == 100 and 5*x + 3 * y + 1/3*z == 100 : print(x,y,z) z += 1 y +=1 x += 1
示例7 求吉利数字
# 求吉利数字 100 ~ 999 之间 找 111 222 333 123 456 654 321 ... """ // 可以获取一个数高位 % 可以获取一个数低位 baiwei = 345 // 100 shiwei = 345 // 10 % 10 gewei = 345 % 10 print(gewei) """ # 方法一 i = 100 while i <= 999: baiwei = i // 100 shiwei = i // 10 % 10 gewei = i % 10 if shiwei == gewei and shiwei == baiwei : print(i) # 123 elif shiwei == gewei - 1 and shiwei == baiwei + 1: print(i) # 987 elif shiwei == gewei + 1 and shiwei == baiwei - 1: print(i) i +=1 # 方法二 print("<====>") i = 100 while i <= 999: strvar = str(i) # print(strvar, type(strvar)) gewei = int(strvar[-1]) shiwei = int(strvar[1]) baiwei = int(strvar[0]) if shiwei == gewei and shiwei == baiwei : print(i) # 123 elif shiwei == gewei - 1 and shiwei == baiwei + 1: print(i) # 987 elif shiwei == gewei + 1 and shiwei == baiwei - 1: print(i) i +=1 # 方法三 print("<====>") i = 100 while i <= 999: strvar = str(i) # print(strvar, type(strvar)) gewei = int(strvar[-1]) shiwei = int(strvar[1]) baiwei = int(strvar[0]) if 2 * shiwei == gewei + baiwei and (shiwei == gewei + 1 or shiwei == gewei -1 ): print(i) elif gewei == shiwei and shiwei == baiwei: print(i) i +=1
示例8 国际棋盘
# 一个循环打印2行,循环4次就是8行
i = 0
while i < 4:
strvar = ""
j = 0
while j < 8:
if j % 2 == 0:
strvar += "□"
else:
strvar += "■"
j += 1
print(strvar) # 正向打印白黑
print(strvar[::-1]) # 反向打印黑白
i += 1
