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查询语句 select * from t_deptselect empno,ename,sal from t_emp select empno, sal * 12 as "income" from t_emp 分页 select empno,ename from t_emp limit 10,5 去 阅读全文
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def log(func): def wrapper(): print("开始执行") func() print("执行完毕") return wrapperdef log_in(func): def wrapper(): print("开始进入...") func() print("结束...") 阅读全文
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class Cat(): tag = ' 猫科动物 ' def __init__(self, name): self.name = name @staticmethod def breah(): print('需要呼吸空气') @classmethod def show_info(cls, name 阅读全文
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class PetCat(): """ 家猫类""" def __init__(self, name, age): self.name = name # 私有属性 self.__age = age @property def age(self): return self.__age @age.set 阅读全文
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""""""class BaseCat(object): """ 猫科基础类""" tag = '猫科动物' def __init__(self, name): self.name = name def eat(self): print('吃东西')class Tiger(BaseCat): """ 阅读全文
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class Cat(): """ 类 """ tag = '我是家猫' def __init__(self, name, age): self.name = name # 私有变量 self.__age = age def set_age(self, age): self.__age = age # 阅读全文
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def write_file(): """ 文件写入""" file_name = "wri2te_test.txt" # 以写入的方式打开 f = open(file_name,'w') # 写入内容 f.write('hello') # 换行符 f.write('\n') # 写入内容 f.wr 阅读全文
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def read_file(): """ 读取文件 """ file_name = 'test.txt' # 打开文件 # f = open(file_name, encoding = 'utf-8') with open(file_name, encoding = 'utf-8') as f: # 阅读全文
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## def use_filer(l):## # 过滤偶数# rest = filter(lambda n: n % 2 != 0, l)# return rest## if __name__ == '__main__':# l = [1,2,3,4,5,6,7,8,9,10,11]# rest = 阅读全文
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## import datetime# from datetime import datetime# import time## now_time = datetime.now()# # now:2019-07-31 15:05:54.306301# print('now:{0}'.format(d 阅读全文