How to use while not in

Question

I m trying to check if a list has no member as boolean operator AND  OR  NOT   I use   while   AND  and  OR  and  NOT   not in list    print  No boolean operator    However  when my input is  a1 c2 OR c3 AND  it prints  No boolean operator   which means this list is considered no boolean operator in it by using above loop sentence   Hope somebody can help to correct   Thanks  Cindy

User · Answer

while not any  x in   AND   OR   NOT   for x in list    EDIT   thank you for the upvotes   but etarion s solution is better since it tests if the words AND  OR  NOT are in the list  that is to say 3 tests   Mine does as many tests as there are words in list   EDIT2   Also there is  while not   AND  in list  OR  in list  NOT  in list    False False False

User · Answer

If I understand the question correctly you are looking for something like this    gt  gt  gt  s    a1 c2 OR c3 AND   gt  gt  gt  boolops     AND    OR    NOT    gt  gt  gt  if not any boolop in s for boolop in boolops           print  no boolean operator        gt  gt  gt  s    test   gt  gt  gt  if not any boolop in s for boolop in boolops           print  no boolean operator       no boolean operator  gt  gt  gt

User · Answer

The expression   AND  and  OR  and  NOT   evaluates to  NOT   so you are testing whether the list has NOT or not

User · Answer

anding strings does not do what you think it does - use any to check if any of the strings are in the list   while not any word in list of words for word in   AND    OR    NOT         print  No boolean    Also  if you want a simple check  an if might be better suited than a while

User · Answer

In your case    AND  and  OR  and  NOT   evaluates to  NOT   which may or may not be in your list     while  AND  not in MyList and  OR  not in MyList and  NOT  not in MyList      print  No Boolean Operator

User · Answer

The expression  AND  and  OR  and  NOT  always evaluates to  NOT   so you are effectively doing  while  NOT  not in some list      print  No boolean operator    You can either check separately for all of them  while   AND  not in some list and          OR  not in some list and          NOT  not in some list         whatever   or use sets  s   set   AND    OR    NOT    while not s intersection some list         whatever

User · Answer

Using sets will be screaming fast if you have any volume of data  If you are willing to use sets  you have the isdisjoint   method which will check to see if the intersection between your operator list and your other list is empty   MyOper   set   AND    OR    NOT    MyList   set   c1    c2    NOT    c3     while not MyList isdisjoint MyOper       print  No boolean Operator    http   docs python org library stdtypes html set isdisjoint

User · Answer

That s not how it works   This bit   AND  and  OR  and  NOT   will evaluate as  NOT   So your code is equivalent to    while not  NOT  in list    print  No boolean operator   You could try this   while not set  AND  and  OR  and  NOT   union list      print  No boolean operator

[python] How to use: while not in

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