[Update: for Python3 (the currently maintained versions of Python) the range() function always returns the dynamic, "lazy evaluation" iterator; the older versions of Python (2.x) which returned a statically allocated list of integers are now officially obsolete (after years of …

Notice that the index runs from 0. This kind of indexing is common among modern programming languages including Python and C. If you want your loop to span a part of the list, you can use the standard Python syntax for a part of the list. For example, to loop from the second item in a list up to but not including the last item, you could use

The range() function in python is a way to generate a sequence. Sequences are objects that can be indexed, like lists, strings, and tuples. Sequences are objects that can be indexed, like lists, strings, and tuples.

range(10, 0, -1) Which gives [10, 9, 8, 7, 6, 5, 4, 3, 2, 1] But for iteration, you should really be using xrange instead. So, xrange(10, 0, -1) Note for Python 3 users: There are no separate range and xrange functions in Python 3, there is just range, which follows the design of …

Oct 14, 2024 · @blackkettle: it's faster because it doesn't need to return the current iteration index, which is a measurable part of the cost of xrange (and Python 3's range, which gives an iterator, not a list). @nemo, range is as optimized as it can be, but needing to build and return a list is inevitably heavier work than an iterator (in Py3, range does return an iterator, like Py2's xrange; backwards ...

Mar 26, 2022 · It is written by people who either do not properly understand Python's for loop, or who have internalized habits from other programming languages that are inappropriate in Python. (No offense to the inevitable swarm of people who have the rare good reason to do this and will see this comment.)

Dec 6, 2015 · Is there a range() equivalent for floats in Python? >>> range(0.5,5,1.5) [0, 1, 2, 3, 4] >>>; range(0.5,5,0.5) Traceback (most recent call last): File "<pyshell#10 ...

Nov 27, 2017 · This is impossible to do with Python's range. But this can be accomplished by creating your own generator function. But this can be accomplished by creating your own generator function. def myRange(start,end,step): i = start while i < end: yield i i += step yield end for i in myRange(0,99,20): print(i)

Jun 30, 2009 · Why are there two nested iterations? For me it produces the same list of data with only one iteration: for single_date in (start_date + timedelta(n) for n in range(day_count)): print ...

Sep 2, 2011 · $ python -m timeit "range(9,-1,-1)" 1000000 loops, best of 3: 0.401 usec per loop The last option is easy to remember using the range(n-1,-1,-1) notation by Val Neekman . [1] As commented by Karl Knechtel, the results presented here are version-dependent and refer to the Python 3.x version that was stable at the time of answering this question.