Python练习案例，面试准备题（一）

# 用户信息表，基于性别，把男性写入到男.txt，女性写入到女.txt

user_dic = {'xiaowang': '男', 'xiaohei': '女', 'xiaohong': '男', 'xiaobai': '女'}
woman = open('woman.txt', 'a+', encoding='utf-8')
man = open('man.txt', 'a+', encoding='utf-8')

for key, value in user_dic.items():
    if value == '男':
        man.write(key + '\n')
    else:
        value == '女'
        woman.write(key + '\n')

woman.close()
man.close()

# 函数自调用

def calc(n):
    print(n)
    if int(n / 2) == 0:
        return n
    return calc(int(n / 2))

calc(1)

# 冒泡排序
l = [3, 6, 2, 9, 1, 88, 2, 10]
#   方式1
for i in range(len(l)):
    for j in range(len(l)):
        if l[i] < l[j]:
            l[i], l[j] = l[j], l[i]
print(l)
#   方式2
for i in l:
    for j in l:
        if i < j:
            i, j = j, i
print(l)

# 内置sort函数排序
l1 = [3, 6, 2, 9, 1, 88, 2, 10]
l1.sort()  # 升序
print(l1)

l1.sort(reverse=True)  # reverse 降序排列
print(l1)

# 三元运算符的应用

user = {
    "status": 1,
    "name": "xiaowang"
}

x = '启用' if user["status"] == 1 else '停用'   #三元运算符格式
print("用户%s的状态为:%s" % (user["name"], x))


l= [1,2,3,4,5]
l1=[]
for i in l:
    j= i+1
    l1.append(j)
print(l1)

l2 = [i+1 for i in l]　　#三元运算符格式

print(l2)