res = os.system('ifconfig')#os.system执行操作系统的命令,在不需要返回请求结果的情况下用
print(res)#结果是0

res1 = os.popen('ifconfig')
print(res1.read())#获取到返回结果

import os,sysinpu = sys.argv
print(inpu)if len(inpu) < 3:print('参数错误')
else:file = inpu[1]content = inpu[2]f = open(file,'w')f.write(content)

print(random.random())  # 随机浮点数，默认取0-1，不能指定范围
print(random.randint(1, 20))  # 随机整数
print(random.choice('sdfsd233'))  # 随机取一个元素
print(random.sample('hello234234史蒂夫34', 4))#从序列中随机取几个元素,返回是一个list

f =random.uniform(1, 9)  # 随机取浮点数，可以指定范围
x = [1, 2, 3, 4, 6, 7]
random.shuffle(x)  # 洗牌,打乱顺序，会改变原list的值
print(x)

names = {"name":"中文","age":36,"assfdf":223,"sdfsdf":23232323,"sdfsdf1":23232323
}names_json = '{"name": "wjx", "age": 36, "assfdf": 223, "sdfsdf": 23232323, "sdfsdf1": 232323234}'with open('aaa.json','w',encoding='utf-8') as f:res = json.dumps(names,ensure_ascii=False)#把字典转成json串  ensure_ascii=False可以显示中文
    f.write(res)names1 = json.loads(names_json)
print(names1)

with open('aaa.json',encoding='utf-8') as f1:name_dict = json.load(f1)print(name_dict)fw = open('aaa.json','w',encoding='utf-8')
json.dump(names,fw,ensure_ascii=False,indent=4)#以4个空格缩进，便于观看

print(time.timezone)#和标准时间相差的时间，单位是s
print(time.time())#获取当前时间戳
print(time.sleep(1))#休息几s
print(time.gmtime())#把时间戳转换成时间元组，如果不传的话，默认取标准时区的时间戳
print(time.localtime())#把时间戳转换成时间元组，如果不传的话，默认取当前时区的时间戳
print(time.mktime(time.localtime()))#把时间元组转换成时间戳
print(time.strftime("%Y-%m-%d %H:%M:%S"))#将时间元组转换成格式化输出的字符串
print(time.strptime("20160204 191919","%Y%m%d %H%M%S"))#将格式化的时间转换成时间元组
print(time.struct_time)#时间元组
print(time.asctime())#时间元转换成格式化时间
print(time.ctime())#时间戳转换成格式化时间
print(datetime.datetime.now())#当然时间格式化输出
print(datetime.datetime.now()+datetime.timedelta(3))#3天后的时间
print(datetime.datetime.now()+datetime.timedelta(-3))#3天前的时间

md = hashlib.md5()#构造一个md5对象
md.update(b'abc123')
print(md.hexdigest())

def md5_password(str,salt = '#^&*(Q$^*&Q^$'):str = str + saltimport hashlibmd = hashlib.md5()md.update(str.encode())return md.hexdigest()print(md5_password('abc123'))

r = redis.Redis(host='211.149.218.16',port=6378,password='123456',db=2)#指定连接redis的端口和ip以及哪个数据库

r.set('zdq','nizhenhao@')#set string类型的值
print(r.get('zdq').decode())#获取值

r.hset('hname', 'key', 'value')#set 哈希类型的值
print(r.hgetall('hname'))  # 获取这个name里所有的key和value

r = redis.Redis(host='211.149.218.16',port=6378,password='123456',db=2)#指定连接redis的端口和ip以及哪个数据库
r_new =  redis.Redis(host='211.149.218.16',port=6378,password='123456',db=12)for k in r.keys():k_type = r.type(k).decode()if k_type == 'string':v = r.get(k)r_new.set(k,v)elif k_type == 'hash':hash_data = r.hgetall(k)for k2,v2 in hash_data.items():r_new.hset(k,k2,v2)else:print('error')

import pymysql
# 创建连接，指定数据库的ip地址，账号、密码、端口号、要操作的数据库、字符集
connect = pymysql.connect(host = '211.149.218.16',port = 3306 ,user = 'jxz',passwd = '123456',db = 'jxz',charset = 'utf8')
cur = connect.cursor()#建立游标,仓库管理员

sql = 'select * from stu '
# insert_sql = 'insert into stu VALUE (89,"zhangdq");'
# cur.execute(insert_sql)
cur.execute(sql)#执行sql
row_1 = cur.fetchone()# 获取查询结果的第一条数据，返回的是一个元组
row_2 = cur.fetchmany(5)# 获取前n行数据，返回一个元组
row_3 = cur.fetchall()# 获取所有数据，返回一个元组
connect.commit()#提交
print(row_3)

import pymysql
from pymysql.cursors import DictCursor
connect = pymysql.connect(host = '211.149.218.16',port = 3306 ,user = 'jxz',passwd = '123456',db = 'jxz',charset = 'utf8')
cur = connect.cursor(DictCursor)#指定游标的类型，字典类型

sql = 'select * from stu '
cur.execute(sql)
res = cur.fetchall()
connect.commit()
print(res)