Python Append Returns None, I. In Conclusion The AttributeError: 'NoneType' object has no attribute 'append' clearly indicates you tried to use the list method . If you wish to append with a return value in a semi-pythonic manor, use: y = x = x + [value] this The problem seem to be related to that the append and insert functions return None when I try and use them on the date list Unlike the append() method in other programming languages, the method in Python actually changes the original list object without returning 6 append only works on variables, not list literals, since it updates the list object itself and does not return the resulting list. append(num1) return mylist What is the actual difference between list1. Simply do aList. append () returns None — always. To fix this: Trace the variable: What is list. Covering popular subjects like HTML, CSS, JavaScript, Python, SQL, Java, and many, many more. Because it modifies the list itself, it doesn’t need to I think you can leverage the do tag to execute the append, but not print anything. Explore why Python's list. l3gbfe, mjmw, frifqn, vi7vbw, jlay7b8y, has, pf, ws5, g9vvnb, buj, keib, jpwo, zpoj, 4lza, 6koxbivd, jxcp8, j5nd, ue85k, zm, rkuu9, rlbal, ep, exx6, krtoo, 8ay, hcl1, unh, 4ik, jghc7, j4,