#2 def reverse_enum(L): for index in reversed(xrange(len(L))): yield index, L[index] L = ['foo', 'bar', 'bas'] for index, item in reverse_enum(L): print index, item #3 L = ['foo', 'bar', 'bas'] for index in reversed(range(len(L))): print index, L[index]...
Sometimes you need to iterate through a dictionary and delete its items after use. To accomplish this task, you can use the .popitem() method, which removes and returns key-value pairs from a dictionary in last-in, first-out (LIFO) order. When the target dictionary is empty, then .popit...
Traverse a Python list in reverse order: In this tutorial, we will learn how to iterate/traverse a given Python list in reverse order using multiple approaches and examples.
In this sense, Python dictionaries are pretty versatile, allowing you to iterate over their keys, values, and items. Note: To learn more about dictionary iteration, check out the How to Iterate Through a Dictionary in Python tutorial. In the following sections, you’ll learn the basics of ...
Reverse for loop using range() Nested for loops While loop inside for loop for loop in one line Accessing the index in for loop Iterate String using for loop Iterate List using for loop Iterate Dictionary using for loop What is for loop in Python In Python, the for loop is used to ite...
Why does list.reverse() return None in Python I wrotea bookin which I share everything I know about how to become a better, more efficient programmer. You can use the search field on myHome Pageto filter through all of my articles. ...
1. Iterate a Dictionary in Python To iterate through a dictionary, we can use Python for loop. Let’s say, we want to print all elements in a dictionary, then we will use for loop as shown in the below example: Python 1 2 3 4 cubes = {1:1, 2:8, 3:21, 4:64, 5:125}...
... three -> 3 two -> 2 one -> 1 >>> # Iterate over the items in reverse order >>> for key, value in reversed(numbers.items()): ... print(key, "->", value) ... three -> 3 two -> 2 one -> 1 >>> # Iterate over the keys in reverse order >>> for key in rever...
forkinsorted(d,reverse=True): print((k,d[k])) ''' Output: ('two', 2) ('three', 3) ('one', 1) ('four', 4) ''' DownloadRun Code Finally, to iterate the dictionary in sorted order of values, you can supply thekeyargument of thesorted()function. ...
要以键的相反顺序迭代,您可以指定reverse的论点sorted()作为True. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 if__name__=='__main__': d={'one':1,'two':2,'three':3,'four':4} fork,vinsorted(d.items(),reverse=True): print((k,v)) ...