Append values to a set in Python

Question

I have a set like this   keep   set generic drugs mapping drug  for drug in drug input    How do I add values  0 1 2 3 4 5 6 7 8 9 10  into this set

User · Answer

This question is the first one that shows up on Google when one looks up "Python how to add elements to set", so it's worth noting explicitly that, if you want to add a whole string to a set, it should be added with .add(), not .update().

Say you have a string foo_str whose contents are 'this is a sentence', and you have some set bar_set equal to set().

If you do bar_set.update(foo_str), the contents of your set will be {'t', 'a', ' ', 'e', 's', 'n', 'h', 'c', 'i'}.

If you do bar_set.add(foo_str), the contents of your set will be {'this is a sentence'}.

User · Answer

Define set  a   set     Use add to append single values  a add 1  a add 2    Use update to add elements from tuples  sets  lists or frozen-sets  a update  3 4     gt  gt  print a   1  2  3  4    If you want to add a tuple or frozen-set itself  use add  a add  5  6     gt  gt  print a   1  2  3  4   5  6     Note  Since set elements must be hashable  and lists are considered mutable  you cannot add a list to a set  You also cannot add other sets to a set  You can however  add the elements from lists and sets as demonstrated with the   update  method

User · Answer

keep update  0 1 2 3 4 5 6 7 8 9 10     Or   keep update np arange 11

User · Answer

keep update yoursequenceofvalues    e g  keep update xrange 11   for your specific example   Or  if you have to produce the values in a loop for some other reason   for    whatever       onemorevalue      whatever      keep add onemorevalue    But  of course  doing it in bulk with a single  update call is faster and handier  when otherwise feasible

User · Answer

You can also use the   operator to concatenate two sets  union in set theory     gt  gt  gt  my set    1   gt  gt  gt  my set   my set    2   gt  gt  gt  my set  1  2    Or a shorter form using       gt  gt  gt  my set    1   gt  gt  gt  my set     2   gt  gt  gt  my set  1  2    Note  In versions prior to Python 2 7  use set        instead of

User · Answer

For me  in Python 3  it s working simply in this way   keep   keep union  0 1 2 3 4 5 6 7 8 9 10     I don t know if it may be correct

User · Answer

The way I like to do this is to convert both the original set and the values I d like to add into lists  add them  and then convert them back into a set  like this   setMenu     Eggs    Bacon   print setMenu   gt    Bacon    Eggs   setMenu   set list setMenu    list   Spam     print setMenu   gt    Bacon    Spam    Eggs   setAdditions     Lobster    Sausage   setMenu   set list setMenu    list setAdditions   print setMenu   gt    Lobster    Spam    Eggs    Sausage    Bacon     This way I can also easily add multiple sets using the same logic  which gets me an TypeError  unhashable type   set  if I try doing it with the  update   method

User · Answer

Use update like this   keep update newvalues

[python] Append values to a set in Python

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