How do I check in python if an element of a list is empty

Question

I have a list like  l        How do I check if l i  is empty   l i         and  l i         dont t work

User · Answer

Just check if that element is equal to None type or make use of NOT operator ,which is equivalent to the NULL type you observe in other languages.

if not A[i]:
    ## do whatever

Anyway if you know the size of your list then you don't need to do all this.

User · Answer

Suppose   letter    a      b   c    for i in range len letter        if letter i                print str i      is empty     output- 1 is emtpy      So we can see index 1 is empty

User · Answer

I got around this with len   and a simple if else statement  List elements will come back as an integer when wrapped in len    1 for present  0 for absent  l       print len l     Prints 0  if len l     0      print  quot Element is empty quot   else      print  quot Element is NOT empty quot    Output   Element is empty

User · Answer

Try   if l i       print  Found element   else      print  Empty element

User · Answer

Unlike in some laguages  empty is not a keyword in Python  Python lists are constructed form the ground up  so if element i has a value  then element i-1 has a value  for all i  gt  0   To do an equality check  you usually use either the    comparison operator    gt  gt  gt  my list     asdf   0  42      None  True   LOLOL    gt  gt  gt  my list 0      asdf  True  gt  gt  gt  my list 4  is None True  gt  gt  gt  my list 2      the universe  False  gt  gt  gt  my list 3      gt  gt  gt  my list 3        True   Here s a link to the strip method  your comment indicates to me that you may have some strange file parsing error going on  so make sure you re stripping off newlines and extraneous whitespace before you expect an empty line

User · Answer

If you want to know if list element at index i is set or not  you can simply check the following   if len l  lt  i      print   empty     If you are looking for something like what is a NULL-Pointer or a NULL-Reference in other languages  Python offers you None  That is you can write   l 0    None   here  list element at index 0 has to be set already l append None    here the list can be empty before   checking if l i     None      print   list has actually an element at position i  which is None

[python] How do I check in python if an element of a list is empty?

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