Checking if type list in python

Question

I may be having a brain fart here  but I really can t figure out what s wrong with my code   for key in tmpDict      print type tmpDict key       time sleep 1      if type tmpDict key    list           print  this is never visible          break   the output is  lt type  list  gt  but the if statement never triggers  Can anyone spot my error here

User · Answer

Python 3 7 7 import typing if isinstance  1  2  3  4  5    typing List       print  quot It is a list quot

User · Answer

This seems to work for me    gt  gt  gt a     x    y    z    gt  gt  gt type a   lt class  list  gt   gt  gt  gt isinstance a  list  True

User · Answer

You should try using isinstance   if isinstance object  list             DO what you want  In your case if isinstance tmpDict key   list            DO SOMETHING  To elaborate  x    1 2 3  if type x     list        print  quot This wont work quot  if type x     list                      one of the way to see if it s list     print  quot this will work quot             if type x     type list         print  quot lets see if this works quot  if isinstance x  list                   most preferred way to check if it s list     print  quot This should work just fine quot   The difference between isinstance   and type   though both seems to do the same job is that isinstance   checks for subclasses in addition  while type   doesn   t

User · Answer

Although not as straightforward as isinstance x  list  one could use as well  this is a list  1 2 3  if type this is a list     type          print  quot This is a list  quot    and I kind of like the simple cleverness of that

User · Answer

Your issue is that you have re-defined list as a variable previously in your code  This means that when you do type tmpDict key    list if will return False because they aren t equal   That being said  you should instead use isinstance tmpDict key   list  when testing the type of something  this won t avoid the problem of overwriting list but is a more Pythonic way of checking the type

[python] Checking if type == list in python

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