Python Efficient way to check if dictionary is empty or not

Question

How to check if dictionary is empty or not  more specifically  my program starts with some key in dictionary and I have a loop which iterates till there are key in dictionary  Overall algo is like this      Start with some key in dict      while there is key in dict     do some operation on first key in dict     remove first key    Please note that some operation in above loop may add new keys to dictionary  I ve tried  for key value in d iteritems    but it is failing as during while loop some new key are added

User · Answer

I just wanted to know if the dictionary i was going to try to pull data from had data in it in the first place  this seems to be simplest way   d       bool d    should return False  d     hello   world    bool d    should return True

User · Answer

Just check the dictionary   d     hello   world   if d    print  not empty  else    print  empty   d      if d    print  not empty  else    print  empty

User · Answer

This will do it   while d      k  v   d popitem         now use k and v       A dictionary in boolean context is False if empty  True otherwise   There is no  first  item in a dictionary  because dictionaries aren t ordered  But popitem will remove and return some item for you each time

User · Answer

any d    This will return true if the dict  d contains at least one truelike key   false otherwise    Example    any  0  test       False  another  more general  way is to check the number of items   len d

User · Answer

As far as I know the for loop uses the iter function and you should not mess with a structure while iterating over it   Does it have to be a dictionary  If you use a list something like this might work   while len my list   gt  0       get last item from list     key  value   my list pop        do something with key and value      maybe     my list append  key  value     Note that my list is a list of the tuple  key  value   The only disadvantage is that you cannot access by key   EDIT  Nevermind  the answer above is mostly the same

User · Answer

I would say that way is more pythonic and fits on line   If you need to check value only with the use of your function   if filter  your function  dictionary values           When you need to know if your dict contains any keys   if dictionary       Anyway  using loops here is not Python-way

User · Answer

Here is another way to do it   isempty    dict1 and True  or False   if dict1 is empty then dict1 and True will give    and this when resolved with False gives False    if dict1 is non-empty then dict1 and True gives True and this resolved with False gives True

[python] Python:Efficient way to check if dictionary is empty or not

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