Add Variables to Tuple

Question

I am learning Python and creating a database connection  While trying to add to the DB  I am thinking of creating tuples out of information and then add them to the DB    What I am Doing  I am taking information from the user and store it in variables   Can I add these variables into a tuple   Can you please help me with the syntax   Also if there is an efficient way of doing this  please share     EDIT Let me edit this question a bit   I only need the tuple to enter info into the DB   Once the information is added to the DB  should I delete the tuple   I mean I don t need the tuple anymore

User · Answer

once the info is added to the DB  should I delete the tuple  i mean i dont need the tuple anymore    No   Generally  there s no reason to delete anything   There are some special cases for deleting  but they re very  very rare   Simply define a narrow scope  i e   a function definition or a method function in a class  and the objects will be garbage collected at the end of the scope   Don t worry about deleting anything    Note   I worked with a guy who -- in addition to trying to delete objects -- was always writing  reset  methods to clear them out   Like he was going to save them and reuse them   Also a silly conceit   Just ignore the objects you re no longer using   If you define your functions in small-enough blocks of code  you have nothing more to think about

User · Answer

In Python 3  you can use   to create a new tuple of elements from the original tuple along with the new element   gt  gt  gt  tuple1     quot foo quot    quot bar quot    gt  gt  gt  tuple2     tuple1   quot baz quot    gt  gt  gt  tuple2   foo    bar    baz     The byte code is almost the same as tuple1     quot baz quot    Python 3 7 5  default  Oct 22 2019  10 35 10    Clang 10 0 1  clang-1001 0 46 4   on darwin Type  quot help quot    quot copyright quot    quot credits quot  or  quot license quot  for more information   gt  gt  gt  def f            tuple1     quot foo quot    quot bar quot           tuple2     tuple1   quot baz quot           return tuple2       gt  gt  gt  def g            tuple1     quot foo quot    quot bar quot           tuple2   tuple1     quot baz quot            return tuple2       gt  gt  gt  from dis import dis  gt  gt  gt  dis f    2           0 LOAD CONST               1    foo    bar                  2 STORE FAST               0  tuple1     3           4 LOAD FAST                0  tuple1                6 LOAD CONST               3    baz                   8 BUILD TUPLE UNPACK       2              10 STORE FAST               1  tuple2     4          12 LOAD FAST                1  tuple2               14 RETURN VALUE  gt  gt  gt  dis g    2           0 LOAD CONST               1    foo    bar                  2 STORE FAST               0  tuple1     3           4 LOAD FAST                0  tuple1                6 LOAD CONST               2    baz                   8 BINARY ADD              10 STORE FAST               1  tuple2     4          12 LOAD FAST                1  tuple2               14 RETURN VALUE  The only difference is BUILD TUPLE UNPACK vs BINARY ADD  The exact performance depends on the Python interpreter implementation  but it s natural to implement BUILD TUPLE UNPACK faster than BINARY ADD because BINARY ADD is a polymorphic operator  requiring additional type calculation and implicit conversion

User · Answer

Another tactic not yet mentioned is using appending to a list  and then converting the list to a tuple at the end   mylist      for x in range 5       mylist append x  mytuple   tuple mylist  print mytuple   returns   0  1  2  3  4    I sometimes use this when I have to pass a tuple as a function argument  which is often necessary for the numpy functions

User · Answer

As other answers have noted  you cannot change an existing tuple  but you can always create a new tuple  which may take some or all items from existing tuples and or other sources    For example  if all the items of interest are in scalar variables and you know the names of those variables   def maketuple variables  names     return tuple variables n  for n in names    to be used  e g  as in this example   def example      x   23   y   45   z   67   return maketuple vars     x y z  split      of course this one case would be more simply expressed as  x  y  z   or even foregoing the names altogether   23  45  67    but the maketuple approach might be useful in some more complicated cases  e g  where the names to use are also determined dynamically and appended to a list during the computation

User · Answer

Tuples are immutable  you can t change which variables they contain after construction  However  you can concatenate or slice them to form new tuples   a    1  2  3  b   a    4  5  6      1  2  3  4  5  6  c   b 1       2  3  4  5  6    And  of course  build them from existing values   name    Joe  age   40 location    New York  joe    name  age  location

User · Answer

You can start with a blank tuple with something like t       You can add with    but you have to add another tuple  If you want to add a single element  make it a singleton  t   t    element    You can add a tuple of multiple elements with or without that trailing comma    gt  gt  gt  t       gt  gt  gt  t   t    1    gt  gt  gt  t  1    gt  gt  gt  t   t    2    gt  gt  gt  t  1  2   gt  gt  gt  t   t    3  4  5   gt  gt  gt  t  1  2  3  4  5   gt  gt  gt  t   t    6  7  8    gt  gt  gt  t  1  2  3  4  5  6  7  8

User · Answer

It s as easy as the following   info 1    one piece of info  info 2    another piece  vars    info 1  info 2     vars  is now a tuple with the values   info 1    info 2     However  tuples in Python are immutable  so you cannot append variables to a tuple once it is created

User · Answer

I m pretty sure the syntax for this in python is   user input1   raw input  Enter Name     user input2   raw input  Enter Value     info    user input1  user input2    once set  tuples cannot be changed

[python] Add Variables to Tuple

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