How can I add items to an empty set in python

Question

I have the following procedure   def myProc invIndex  keyWord       D        for i in range len keyWord            if keyWord i  in invIndex keys                        D update invIndex query i        return D   But I am getting the following error   Traceback  most recent call last     File   lt stdin gt    line 3  in  lt module gt  TypeError  cannot convert dictionary update sequence element  0 to a sequence   I do not get any error if D contains elements  But I need D to be empty at the beginning

User · Answer

When you assign a variable to empty curly braces    eg  new set       it becomes a dictionary   To create an empty set  assign the variable to a  set    ie  new set   set

User · Answer

D       is a dictionary not set    gt  gt  gt  d       gt  gt  gt  type d   lt type  dict  gt    Use  D    set      gt  gt  gt  d   set    gt  gt  gt  type d   lt type  set  gt   gt  gt  gt  d update  1    gt  gt  gt  d add 2   gt  gt  gt  d update  3 3 3    gt  gt  gt  d set  1  2  3

User · Answer

gt  gt  gt  d       gt  gt  gt  D   set    gt  gt  gt  type d   lt type  dict  gt   gt  gt  gt  type D   lt type  set  gt    What you ve made is a dictionary and not a Set   The update method in dictionary is used to update the new dictionary from a previous one  like so    gt  gt  gt  abc    1  2   gt  gt  gt  d update abc   gt  gt  gt  d  1  2    Whereas in sets  it is used to add elements to the set    gt  gt  gt  D update  1  2    gt  gt  gt  D set  1  2

[python] How can I add items to an empty set in python

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