tinydict={'Name':'郑晖','Age':18,'Class':'腾讯云社区'}forvalintinydict.values():print(val) 同时遍历值和键: 代码语言:python 代码运行次数:2 运行 AI代码解释 tinydict={'Name':'郑晖','Age':18,'Class':'腾讯云社区'}fork,vintinydict.items():print(k,v
1importthreading2importtime3classtest1(threading.Thread):4def__init__(self,name,t):5threading.Thread.__init__(self)6self.name=name7self.t=t8defrun(self):9#获取锁,用于线程同步10threadLock.acquire()11print('开始修改列表'+time.ctime())12#[iforiinrange(100)]创建一个[0,1,2...99]的...
def__init__(self): self._observers=[] defattach(self,observer_func): self._observers.append(observer_func) defnotify(self,*args,**kwargs): forobserver_funcinself._observers: observer_func(*args,**kwargs) classObserver: def__init__(self,name): self._name=name defupdate(self,value): ...
classRange:def__init__(self,start,end,step=1):assertstep>0# 简单起见,我们只处理步长 > 0 的情况self.start=start self.end=end self.step=stepdef__iter__(self):returnRangeIterator(self.start,self.end,self.step)# 返回迭代器classRangeIterator:def__init__(self,num,end,step):self.num=num ...
# 使用for循环打印1到10 for i in range(1, 11): print(i) # 使用while循环计算1到10的...
11、使用不存在的字典键值 导致“KeyError:‘spam’” 该错误发生在如下代码中: 12、尝试使用Python关键字作为变量名 导致“SyntaxError:invalid syntax” Python关键不能用作变量名,该错误发生在如下代码中: Python3的关键字有:and, as, assert, break, class, continue, def, del, elif, else, except, False...
con = cx_Oracle.connect('pythonhol/welcome@127.0.0.1/orcl') ver = con.version.split(".") for v in ver: print v if v == "11": print "It's 11" else: print "Not 11" con.close() 确保缩进正确! 使用冒号“:”表示代码块。第一个 print 和 if 位于同一个缩进级别,因为它们两个都...
2 Python在MPU上实现嵌入式常用算法... 11 2.1 什么是递归,运用递归需要注意哪些问题?... 11 2.2 Python能否用递归来实现一个汉诺塔问题?... 11 2.3 能否用Python实现一个Huffman编码?... 12 2.4 能否用Python实现一个游程编码?... 14 2.5 能否用Python实现一个直方图算法?... 16 ...
Objects are instances of a class (for example, the class “cars”) and have methods and attributes. This contrasts with languages that center on a series of functions. Moreover, Python is defined as a high-level programming language (in opposition to low-level languages, such as assembly),...