If-else in for loop Loop Control Statements in for loop Break for loop Continue Statement in for loop Pass Statement in for loop Else block in for loop Reverse for loop Backward Iteration using the reversed() function Reverse for loop using range() Nested for loops While loop inside for ...
change = [1, 'pennies', 2, 'dimes', 3, 'quarters'] # this first kind of for-loop goes through a list for number in the_count: print "This is count %d" % number # same as above for fruit in fruits: print "A fruit of type: %s" % fruit # also we can go through mixed lis...
>>> # Support reverse iteration out of the box >>> for char in reversed(text): ... print(char) ... ! d l r o W , o l l e H >>> text "Hello, World!" 在这里,您调用reversed()withtext作为参数来提供for循环。此调用按预期工作并返回相应的迭代器,因为UserString从str. 请注意,调用...
在里面ReversibleString,你创造.reverse()。此方法反转包装的字符串.data并将结果重新分配回.data. 从外部看,调用的.reverse()工作就像将字符串反转到位。然而,它实际上做的是创建一个新的字符串,以相反的顺序包含原始数据。 以下是ReversibleString实践中的工作原理: >>>letters="AaBbCcDd">>>#Getallcharactersrely...
$python-mtimeit-n1000000-s'importnumpyasnp''mylist=list(np.arange(0,200))''mylist.reverse()'1000000loops,bestof5:10.7usecperloop 这两种方法都可以反转列表,但需要注意的是内置函数reverse()会更改原始列表,而切片方法会创建一个新列表。 显然,内置函数reverse()比列表切片方法更快!
To loop in the reverse direction, you can use Python's built-in reversed function:>>> colors = ["purple", "blue", "green", "pink", "red"] >>> for color in reversed(colors): ... print("I like", color) ... I like red I like pink I like green I like blue I like ...
forkeyinreversed(my_dict):print(key,my_dict[key]) 1. 2. 上面的代码会倒序输出字典中的键值对,结果如下: orange 1 banana 3 apple 2 1. 2. 3. 使用sorted()函数 另一种方法是使用sorted()函数,它可以对字典中的键进行排序。默认情况下,sorted()函数会按照键的升序排列,但通过指定reverse=True参数可...
>>> sorted(a, reverse=True) [9, 8, 7, 6, 5, 4, 3, 2, 1, 0] >>> str(a) '[0, 1, 2, 3, 4, 5, 6, 7, 8, 9]' >>> sum(a) 45 3.Extract Functions or Generators 上述两种方法是很好的处理更简单的逻辑。更复杂的逻辑怎么样?作为程序员,我们编写函数来抽离出复杂的业务。相...
In this Python tutorial, I will explain how toreverse a list in Pythonusing while loop and for loop. The reverse of data in the list is used in data processing or any other fields where the order of operations needs to be reversed in functional programming contexts. ...
()<<endl;vector<int>::iterator fwit;//定义正向迭代器vector<int>::reverse_iterator bwit;//定义反向迭代器cout<<"迭代器正向迭代: ";for(fwit=result.begin();fwit!=result.end();fwit++){//用迭代器遍历容器cout<<*fwit<<" ";}cout<<endl;cout<<"迭代器反向迭代: ";for(bwit=result....