Python中for循环语句实战案例

for i in range(10):
    print(i)

age = 38
for i in range(3):
    guess = int(input("猜测的年龄："))
    if (guess>age):
        print("猜大了")
    elif (guess<age):
        print("猜小了")
    else:
        print("猜对了")

for i in range(50,100):
    if (i%2 == 1):
        print(i)

for i in range(50,100):
    if (i%2 == 0):
        print(i)

number = [6,7,4,2,1,3,5]
for i in range(5):
    for j in range(6):
        if (number[j] > number[j+1]):
            tmp=number[j]
            number[j]=number[j+1]
            number[j+1]=tmp
print(number)

for i in range(1,6):
    for j in range(1,3):
        print(f"{i}层-{i}0{j}室")

for i in range(1,6):
    for j in range(1,3):
        if i==3:
            continue
        print(f"{i}层-{i}0{j}室")

for i in range(1,6):
    for j in range(1,3):
        if i==3:
            continue   #跳过第三层，从第四层开始
        if i==2 and j==2:
            break      #当dao2层2室的时候直接退出二层循环。从三层开始走
        print(f"{i}层-{i}0{j}室")

#一种方法
for i in range(1,6):
    print("*" * i)
for i in range(4,0,-1):
    print("*" * i)
#第二种方法
n=10
for i in rang(n):
    if i<5:
        print(i*"*")
    else:
        print((n-i)*"*")

while 条件：   #只要条件为真，就不断循环
    print(xxxxx)

count = 0
while True:
    print(f"第{count}次循环")
    count +=1

count = 0
while count < 10:
    print(f"第{count}次循环....")
    count+=1

for i in range(1,10):
    print()
    for j in range(1,i+1):
        print(f"{i}*{j}={i*j}",end=" ")

guess_age = 30
guess_num=0
while True:
    guess_num += 1
    if guess_num<=3:
        guess = int(input("请输入猜的数字："))
        if guess < guess_age:
            print("数字猜小了")
        elif guess > guess_age:
            print("数字猜大了")
        else:
            print("恭喜猜对了")
    else:
            choice = str(input("错三次了，你还想继续猜吗？[yes/no]"))
            if choice == "":
                continue
            elif choice == "yes":
                print("游戏继续")
                guess_num = 0
            else:
                break

import random #导入random模块
a = random.choice("abcdefghigk") #参数也可以是一个列表
print(a)
s = "asdfghjklzxcv"
s = random.sample(s,5) #从数据源s中随机取出5个值
print(s)
i = random.randint(1,100) #打印一个随机数
print(i)

import string
a = string.ascii_letters  #大小写全部字符
print(a)
s = string.ascii_uppercase #大写字符
print(s)
i = string.ascii_lowercase #小写字符
print(i)
j = string.punctuation #打印特殊字符
print(j)
g = string.digits #打印数字
print(g)

import random
import string
num_lsit = []
tmp = (string.digits+string.ascii_uppercase)
print(random.sample(tmp,5))
count = 3
while count > 0:
    count-=1
    num_lsit = []
    for i in range(20):
        car_code = random.choice(string.ascii_uppercase)
        car_num = f"京{car_code}-{''.join(random.sample(tmp,5))}"
        num_lsit.append(car_num)
        print(i,car_num)
    choice = input("choice:").strip()
    if choice in num_lsit:
        exit(f"恭喜你选购成功，您的车牌为{choice}")
    else:
        print(f"未选中，还有{count}次机会")

import random
import string
a = []
for j in range(1,301):
    a.append(j)            #建立一个员工的地址池
###########抽一等奖##############
print("抽一等奖，三等奖是泰国五日游")
print("得奖员工：",end="")
for yi in range(3):
    tmp = random.choice(a)   #随机去一个员工
    print(tmp,end=" ")
    a.remove(tmp)           #因为每个员工只能拿一个奖，所以删除员工池以得奖的用户
print("")                   #另起一行
###########抽二等奖###############
print("抽二等奖，二等奖是一部iphon手机")
print("得奖员工：",end="")
for er in range(7):
    tmp = random.choice(a)
    print(tmp,end=" ")
    a.remove(tmp)
print("")
############抽三等奖##############
print("抽三等奖，三等奖是小玩具一个")
print("得奖员工：",end="")
for san in range(11):
    tmp=random.choice(a)
    print(tmp,end=" ")
    a.remove(tmp)