day05-集合

l  = [1,2,3,3,3,44,4,4,1]

print(set(l))

s = set()
s  = {1,2,3,4}


def my(name,sex=‘男‘): #形式参数
    print(‘hahaha‘,name)
    return name

my(‘111‘)#实际参数


def read_file(file_name):
    with open(file_name,encoding=‘utf-8‘) as f:
        return f.read()

import datetime
def welcome(name):
    msg = ‘欢迎登录【%s】,今天的日期是 【%s】‘%(name,datetime.date.today())
    print(msg)
import json
f  = open(‘a.txt‘,‘w‘,encoding=‘utf-8‘)
# res = f.read()
# json.loads(res) #
# json.load(f)  #把json串变成字典
goods  = {
    ‘宝马‘:11111,
    ‘奔驰‘:22222
}
print(json.dumps(goods))

# json.dumps(d) #把字典转成json

# json.dump(goods,f,ensure_ascii=False)# json会帮你write一次

msg = ‘欢迎光临 {name} ,今天的日期是 {today} ‘

msg = msg.format(name=‘刘欣雨‘,today=datetime.datetime.today() )
print(msg)
# sql = ‘insert into my_user value ({id},{name},{addr},{sex},{phone}) ‘
# sql.format(name=‘aaa‘,addr=‘sdfsfd‘,sex=‘xxx‘,id=11)

# sql = ‘insert into {} value {}; ‘.format(‘abc,‘,‘bcd‘)
# print(sql)
# sql=‘insert into my_user value (%s,%s,%s,%s,%s,%s,%s,%s)‘%(id,name,sex,addr,phone,)
# +
# %s

# format_map
d = {‘name‘:‘小黑‘,‘sex‘:‘不知道‘}
words =‘名字 {name}  ,性别 ： {sex}‘.format_map(d)
print(words)

#字符集
        # 只认识2进制 0  1
        # 0 1
    # 阿斯克码表     12  {}