Python's enumerate function reduces the visual clutter by hiding the accounting for the indexes, and encapsulating the iterable into another iterable (an enumerate object) that yields a two-item tuple of …

For such a short input, the higher fixed overhead of invoking the list constructor (overhead that has come down dramatically in later versions of Python) is not made up by the lower per-item overhead …

I'm a bit late but here's how I did this. The steps: Create a list of all columns Use itertools to take x combinations Append each result R squared value to a result dataframe along with excluded column …

Building on the answer by @unutbu, I have compared the iteration performance of two identical lists when using Python 3.6's zip() functions, Python's enumerate() function, using a manual counter (see …

This is an alternative. enumerate works quite differently. python's enumerate would index an arbitrary sequence independently of it's internal index state. It yields a 'substitute' iterable sequence with …

Is there an efficient way to know how many elements are in an iterator in Python, in general, without iterating through each and counting?

0 In this example, the objective is to, using a Python 'for' loop, REMOVE from an array of integers any element that is perfectly divisible by 7:

I'm using a for loop to read a file, but I only want to read specific lines, say line #26 and #30. Is there any built-in feature to achieve this?

Use enumerate method to add index or counter to an iterable (list, tuple, etc.). Now using the index+1, we can access the next element while iterating through the list.

Apr 28, 2015 · I am using Python 2.5, I want an enumeration like so (starting at 1 instead of 0):