Python add item to the tuple

Question

I have some object ID-s which I try to store in the user session as tuple  When I add first one it works but tuple looks like  u 2    but when I try to add new one using mytuple   mytuple   new id got error can only concatenate tuple  not  unicode   to tuple

User · Answer

1 form  a     x    y   b   a     z    print b     2 form  a     x    y   b   a   tuple  b   print b

User · Answer

Tuple can only allow adding tuple to it  The best way to do it is   mytuple   u 2    mytuple    new id     I tried the same scenario with the below data it all seems to be working fine    gt  gt  gt  mytuple    u 2     gt  gt  gt  mytuple      example text     gt  gt  gt  print mytuple  u 2   example text

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gt  gt  gt  x    u 2     gt  gt  gt  x    u random string   Traceback  most recent call last     File   lt pyshell 11 gt    line 1  in  lt module gt      x    u random string  TypeError  can only concatenate tuple  not  unicode   to tuple  gt  gt  gt  x     u random string        concatenate a one-tuple instead  gt  gt  gt  x  u 2   u random string

User · Answer

From tuple to list to tuple    a     2    b    b   l   list a  l append b   tuple l    Or with a longer list of items to append  a     2    items     o    k    d    o    l   list a   for x in items      l append x   print tuple l    gives you   gt  gt  gt     2    o    k    d    o     The point here is  List is a mutable sequence type  So you can change a given list by adding or removing elements  Tuple is an immutable sequence type  You can t change a tuple  So you have to create a new one

User · Answer

Bottom line  the easiest way to append to a tuple is to enclose the element being added with parentheses and a comma   t     a   4   string   t   t    5 0   print t   out    a   4   string   5 0

User · Answer

You need to make the second element a 1-tuple  eg   a     2    b    z  new   a    b

User · Answer

Since Python 3 5  PEP 448  you can do unpacking within a tuple  list set  and dict   a     2    b    z  new     a  b

[python] Python add item to the tuple

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