Check if item is in an array list

Question

If I ve got an array of strings  can I check to see if a string is in the array without doing a for loop   Specifically  I m looking for a way to do it within an if statement  so something like this   if  check that item is in array

User · Answer

Use a lambda function  Let s say you have an array  nums    0 1 5   Check whether 5 is in nums in Python 3 X   len list filter  lambda x   x    5  nums     gt  0   Check whether 5 is in nums in Python 2 7   len filter  lambda x   x    5  nums    gt  0    This solution is more robust  You can now check whether any number satisfying a certain condition is in your array nums  For example  check whether any number that is greater than or equal to 5 exists in nums   len filter  lambda x   x  gt   5  nums    gt  0

User · Answer

You have to use  values for arrays   for example say you have dataframe which has a column name ie  test  Name    you can do  if name in test  Name   values      print name    for a normal list you dont have to use  values

User · Answer

You can also use the same syntax for an array  For example  searching within a Pandas series   ser   pd Series   some    strings    to    query     if item in ser values        do stuff

User · Answer

I m also going to assume that you mean  list  when you say  array   Sven Marnach s solution is good  If you are going to be doing repeated checks on the list  then it might be worth converting it to a set or frozenset  which can be faster for each check  Assuming your list of strs is called subjects   subject set   frozenset subjects  if query in subject set        whatever

User · Answer

Assuming you mean  list  where you say  array   you can do  if item in my list        whatever   This works for any collection  not just for lists  For dictionaries  it checks whether the given key is present in the dictionary

[python] Check if item is in an array / list

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