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Few stylistic points about your current solution: use print() as a function for Python 3 compatibility; on the other hand, because you are running it on Python 2.x, you may avoid creating an extra list with range() and use xrange() function (differences); according to PEP8, you need to have spaces around the operators ; you can use end -= 1 shortcut instead of end = end - 1 The zip function takes multiple lists and returns an iterable that provides a tuple of the corresponding elements of each list as we loop over it.. In Python 3, range behaves the same way as xrange does in 2.7. For loop iteration will start at 0, and the condition inside the for loops (i < Size) will ensure the compiler, not to exceed the array limit. Various python programming features can be used to achieve this. Python replace in numpy array more or less than a specific value. Using range(N, -1, -1) We are using the range function but starting with the position -1. Depending on how many arguments you pass to the range() function, you can choose where that sequence of numbers will begin and end as well as how big the difference will be between one number and the next. If we iterate on a 1-D array it will go through each element one by one. Python numpy log10 explanation with example. Solution Python Sometimes we require to perform the looping backward and having shorthands to do so can be quite useful. @hacksoi depends on the use case but let's say you're iterating backwards in a large buffer, let's say it's 10 MB, then creating the reverse indices upfront would take seconds and use up over 50 MB of memory. Reverse two dimensional array in python. Sometimes we need to go through the elements of a list in backward order. Note that zip with different size lists will stop after the shortest list runs out of items. Above array in reversed order: Algorithm. As we deal with multi-dimensional arrays in numpy, we can do this using basic for loop of python. Here we are using two different tricky methods that how to reverse a two-dimensional array in python. Don't expect just to The iteration of numbers is done by looping techniques in Python. Iterating means going through elements one by one. In python, we have range() function to iterate. There are many techniques in Python which facilitate looping. printf("\nPlease Enter the size of an array: "); scanf("%d",&Size); The below For loop in reverse array program will help to iterate each cell present in a[5] array. You may want to look into itertools.zip_longest if you need different behavior. To achieve this we need to read the last element first and then the last but one and so on till the element at index 0. Given an array (or string), the task is to reverse the array/string. Python’s inbuilt range() function is handy when you need to act a specific number of times. Print the element arr[i] in each iteration. Iterating Arrays. first method: Here in python, the reverse function can convert any array into reverse order, Thus we can easily use the built-in function without taking extra effort to make this essential conversion. The range() function enables us to make a series of numbers within the given range. I'm new to python and i can't figure out how to write a reverse for loop in python e.g. ... Iterate over the list in reverse using ‘for’ loop : loop helps us always while iterating through something. Declare and initialize an array. Loop through the array in reverse order that is, the loop will start from (length of the array - 1) and end at 0 by decreasing the value of i by 1. the python equivalent to the c++ loop for (i = 10; i >= 0; --i) The exact equivalent would be: for i in range(10, -1, -1): print i except you virtually never want to do that in Python. 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