python list extend none
listOneandlistTwo=listOne.extend(listTwo). extend() extends the given list but returns None *, so you have extended listOne with the contents of listTwo and ... , 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: ,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 ... ,,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. ,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 ... ,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 . , extend , like many other list operations, operates in-place and returns None. ListA is modified with the extra elements.
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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 |