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The main problem with solutions testing all possible couples (with imbricated loops or itertools.combinations) is that that are O(n^2), as you basically test all possible combinations of two elements among n (there are n*(n-1)/2 such combinations) until you find a valid one.
Oct 11, 2012 · Usage: >>> f(10,20) 1020. >>> f(99,193) 99193. This version however, does not allow you to merge numbers like 03 and 02 to get 0302. For that you would need to either add arguments to specify the number of digits in each integer, or use strings. edited Mar 27, 2021 at 20:53. answered Oct 11, 2012 at 11:40.
Oh, forgot to mention efficiency in the answer... but I guess I'm no expert anyway. I see no reason why it would be particularly inefficient to keep a fixed number of "fractional digits" around -- although any operations performed on the numbers might necessitate a rounding operation on the result to bring it in line with the requirements...
Aug 8, 2011 · Since Python is a strongly typed language, concatenating a string and an integer, as you may do in Perl, makes no sense, because there's no defined way to "add" strings and numbers to each other. Explicit is better than implicit....says "The Zen of Python", so you have to concatenate two string objects
Aug 16, 2013 · n numbers between 11 and 16 that are the log of evenly-spaced numbers (results in a concave curve): np.log(np.linspace(np.e**11, np.e**16, n)) n numbers between 11 and 16 that are the normalization of evenly-spaced numbers on log scale (results in a convex curve): (np.logspace(11, 16, n, base=np.e) - np.e**11)/(np.e**16 - np.e**11)*(16-11) + 11
Aug 31, 2009 · import sys try: a, b = sys.argv[1:3] print "sum is ", float(a) + float(b) except ValueError: print "please give me two numbers to sum" Beware that floating points are different from real numbers, so that you could obtain seemingly "strange" results about which there is a wealth of documentation on the web.
Sep 10, 2013 · # Pythonic approach leveraging map, operator.add for element-wise addition. import operator third6 = list(map(operator.add, first, second)) # v7: Using list comprehension and range-based indexing # Simply an element-wise addition of two lists.
The operations add, subtract, and compare operate on numbers - 101 base 2 == 5 base 10 and addition is the same logical operation no matter what base you're working in. The fact that your python interpreter may store things as binary internally doesn't affect how you work with it - if you have an integer type, just use +, -, etc.
Oct 23, 2017 · 10. In python (and a lot of other languages), the + operator serves a dual purpose. It can be used to get the sum of two numbers (number + number), or concatenate strings (string + string). Concatenate here means join together. When you use raw_input, you get back the user's input in the form of a string.
Feb 27, 2023 · I know this is old, and at the time of writing, 45 people have agreed your answer is good, but strictly speaking the OP asked to add items to a list, and this is creating a new list. Although a very similar/related statement would be: a += b.
