comma

I want to write a method that will take an integer and return a std::string of that integer formatted with commas. Example declaration: std::string FormatWithCommas(long value); Example usage: std::string result = FormatWithCommas(7800); std::string result2 = FormatWithCommas(5100100); std::string result3 = FormatWithCommas(201234567890); // result = "7,800" // result2 = "5,100,100" // result3 = "201,234,567,890" What is the C++ way of formatting a number as a string with commas? (Bonus would be to handle double s as well.) Use std::locale with std::stringstream #include <iomanip> #include

I am curious why in Python a trailing comma in a list is valid syntax, and it seems that Python simply ignores it: >>> ['a','b',] ['a', 'b'] It makes sense when its a tuple since ('a') and ('a',) are two different things, but in lists? Raymond Hettinger The main advantages are that it makes multi-line lists easier to edit and that it reduces clutter in diffs. Changing: s = ['manny', 'mo', 'jack', ] to: s = ['manny', 'mo', 'jack', 'roger', ] involves only a one-line change in the diff: s = ['manny', 'mo', 'jack', + 'roger', ] This beats the more confusing multi-line diff when the trailing comma