/usr/bin/python3 a=[1,2,3,4,5,6] a.reverse() # a=[6,5,4,3,2,1] print(a) 1. 2. 3. 4. 5. 6. 运行结果 reversed() 作用:也是反转元素,不过类型可以是tuple, string, list 或 range。 Demo #!/usr/bin/python3 #列表 a=[1,2,3] print(list(reversed(a))) #元组 b=(1,2...
Out[23]: '瓜南小个一是你' 参考stackflow上的答案。 原理是:This is extended slice syntax. It works by doing [begin:end:step] - by leaving begin and end off and specifying a step of -1, it reverses a string. 切片介绍:切片操作符中的第一个数(冒号之前)表示切片开始的位置,第二个数(冒号...
Here is rpn.py, a script implementing a reverse-Polish notation (RPN) calculator for Python.As well as providing for traditional numeric calculator operations, it provides easy access to many Python functions, and you can put Python objects and functions onto the stack and operate on them.I...
Initializing the JIT engine with a stack: >>> jitter=machine.jitter(loc_db,jit_type='python') >>> jitter.init_stack() Add the shellcode in an arbitrary memory location: >>> run_addr=0x40000000>>>frommiasm.jitter.cstsimportPAGE_READ,PAGE_WRITE>>> jitter.vm.add_memory_page(run_addr,...
stack=[]foriinrange(0,len(tokens)):iftokens[i] !='+'andtokens[i] !='-'andtokens[i] !='*'andtokens[i] !='/': stack.append(int(tokens[i]))else: a=stack.pop() b=stack.pop()iftokens[i] =='+': stack.append(a+b)iftokens[i] =='-': ...
intn1 = stack.pop(), n2 = stack.pop(); stack.push(n2 / n1); break; default: stack.push(Integer.parseInt(a[i])); } } returnstack.pop(); } Python: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 # Time: O(n) ...
(&self->data); vec_capacity = self->vec_capacity; retstr->buf = heap_buf->buf; retstr->p_buf_capacity = &heap_buf->buf_capacity; retstr->vec_capacity = vec_capacity; } else // capacity <= 0x100 { stack_buf = smallvec::SmallVecData<A>::inline_mut(&self->data); buf = _...
concatenate((a,b)) Out[109]: array([[1, 2], [3, 4], [5, 6]]) np.concatenate((a,b.T),axis=1) Out[110]: array([[1, 2, 5], [3, 4, 6]]) 或者: np.stack() np.hstack() np.vstack((A,B)) np.dstack()1. Python3 列表,数组,矩阵的相互转换 mylist = [[1, 2, ...
stack=[]# 列表实现栈的 先入后出功能count=0whilecur:count=count+1stack.append(cur)# 入栈cur=cur.nextifcount%k==0:# 已存储k个元素count=0whilestack:# 出栈倒换tmpresult.next=stack.pop()tmpresult=tmpresult.next# 处理 stack 中剩余元素whilestack:tmpresult.next=stack.pop(0)#tmpresult=tmpres...
在其他编程语言所实现的“栈”中,往往会提供一个 push() 方法,用于实现入栈操作,但 Python 的列表并没有提供 push() 方法,我们可以使用 append() 方法来代替 push() 方法实现入栈操作。 下面代码示范了使用列表作为“栈”的示例: stack = [] # 向栈中“入栈”3个元素 stack.append("fkit") stack.appe...