python list extend none
ls = [1].extend([2,3]) print ls -> None. list.extend happens in place and returns None, so your ls variable is just getting the returned None.,It doesn't return a new list -- it returns None , like most methods that modify the list. Simply do ... Or, if you need to support python 2, use the + operator:
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 python list extend none 相關參考資料
.extend() method returning 'None' and not the desired combination ...
listOneandlistTwo=listOne.extend(listTwo). extend() extends the given list but returns None *, so you have extended listOne with the contents of listTwo and ... https://stackoverflow.com A strange behavior of list.extend() - Python - Bytes
ls = [1].extend([2,3]) print ls -> None. list.extend happens in place and returns None, so your ls variable is just getting the returned None. https://bytes.com Appending turns my list to NoneType - Stack Overflow
It doesn't return a new list -- it returns None , like most methods that modify the list. Simply do ... Or, if you need to support python 2, use the + operator: https://stackoverflow.com Extending list returns None - Stack Overflow
The function extend is an in-place function i.e. It will make the changes to the original list itself. From the docs. Extend the list by appending all the items in the ... https://stackoverflow.com Python extend with an empty list bug? - Stack Overflow
https://stackoverflow.com Type error when trying to extend a list in Python - Stack Overflow
You are storing the result of the list.append() or list.extend() method; both alter the list in place and return None . They do not return the list object again. https://stackoverflow.com Unexpected Behavior of Extend with a list in Python - Stack Overflow
The extend() method appends to the existing array and returns None . In your case, you are creating an array — [4, 5, 6] — on the fly, extending it and then ... https://stackoverflow.com Why does append return none in this code? - Stack Overflow
append is a mutating (destructive) operation (it modifies the list in place instead ... It is a convention in Python that methods that mutate sequences return None . https://stackoverflow.com Why when I extend a list does it have 'NoneType' as type - Stack ...
extend , like many other list operations, operates in-place and returns None. ListA is modified with the extra elements. https://stackoverflow.com |