Append a tuple to a list - what s the difference between two ways

Question

I wrote my first  Hello World  4 months ago  Since then  I have been following a Coursera Python course provided by Rice University  I recently worked on a mini-project involving tuples and lists  There is something strange about adding a tuple into a list for me   a list      a list append  1  2           Succeed  Tuple  1  2  is appended to a list a list append tuple 3  4      Error message  ValueError  expecting Array or iterable   It s quite confusing for me  Why specifying the tuple to be appended by using  tuple       instead of simple         will cause a ValueError   BTW  I used CodeSkulptor coding tool used in the course

User · Answer

Because tuple 3  4  is not the correct syntax to create a tuple  The correct syntax is -   tuple  3  4     or    3  4    You can see it from here - https   docs python org 2 library functions html tuple

User · Answer

It has nothing to do with append   tuple 3  4  all by itself raises that error   The reason is that  as the error message says  tuple expects an iterable argument   You can make a tuple of the contents of a single object by passing that single object to tuple   You can t make a tuple of two things by passing them as separate arguments   Just do  3  4  to make a tuple  as in your first example   There s no reason not to use that simple syntax for writing a tuple

User · Answer

I believe tuple   takes a list as an argument For example   tuple  1 2 3     returns  1 2 3    see what happens if you wrap your array with brackets

User · Answer

There should be no difference  but your tuple method is wrong  try   a list append tuple  3  4

User · Answer

The tuple function takes only one argument which has to be an iterable     tuple  iterable        Return a tuple whose items are the same and in the same order as iterable   s items    Try making 3 4 an iterable by either using  3 4   a list  or  3 4   a tuple   For example  a list append tuple  3  4      will work

[python] Append a tuple to a list - what's the difference between two ways?

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