if x < 0:
    pass
elif x == 0:
    pass
else:
    pass

for i in range(5):
    pass

    a = [22,33,44] //list
    a.insert(2,-1)
    a.append(55)
    a.index(22)
    a.remove(22)
    a.reverse()
    a.sort()
    a.pop()
    del a  //删除列表
    
    t = 1,2,3,'hello' //元组
    u = t,(1,2,3) //元组
    h = 'tt', //元组
    
    m = set('aaaabbbccc') //set
    
    d = {'t1':222, 't2': 333} //dict
    
    //循环dict
    for k, v in d.items():
        print(k,v)
        
    //循环列表
    for i, v in enumerate(['a','v','c']):
        print(i, v)
        
    //zip 循环两个序列 按照顺序取值
    q = ['name','age']
    an = ['mn','22']
    for q, a in zip(q, an):
        print(q, a)

if __name__ == "__main__":
    pass

try:
    
except:

else:

finally:

class Sample:
    """类文档说明"""
    i = 123 //类属性
    __private_name = 222 //私有变量    
    def __init__(self,name):
        self.name = name
    
    def f(self)://类方法
        return 'hello'