Check if string not contains strings from the list

Question

I have the following code:

mystring = ["reddit", "google"]
mylist = ["a", "b", "c", "d"]
for mystr in mystring:
  if any(x not in mystr for x in mylist):
    print mystr

I'm expecting that this should return only google. But for some reason it returns both reddit and google.

Answer 1

Your use of any and not in contradicts itself. You want to check either for all like this:

if all(x not in mystr for x in mylist):
    print mystr

Or just check for not any (which is more readable in my opinion):

if not any(x in mystr for x in mylist):
    print mystr

Both of these versions can be a one-liner by the way (instead of your loop), if you use list comprehension (but that is just a matter of taste, or if you prefer to print out one line of results instead of one line for every result):

mystring = ["reddit", "google"]
mylist = ["a", "b", "c", "d"]
print [s for s in mystring if not any(x in s for x in mylist)]

Answer 2

if you don't want any of these letters to appear in your strings, then you should use:

all(x not in mystr for x in mylist)

and not any :

mystring = ["reddit", "google"]
mylist = ["a", "b", "c", "d"]
for mystr in mystring:
  if all(x not in mystr for x in mylist):
    print mystr

prints only

google

Answer 3

To ensure the input string does not contain any char from the list, your condition should be:

...
if not any(x in mystr for x in mylist):

Answer 4

Here is your code working, just with different variable names:

words = ["reddit", "google"]
chars = ["a", "b", "c", "d"]
for word in words:
    print(word,":",[char not in word for char in chars]) #explanation help
    if all(char not in word for char in chars):
        print("none of the characters is contained in",word)

Its output:

reddit : [True, True, True, False]
google : [True, True, True, True]
none of the characters is contained in google

As you see you only need to change any to all . This is because you want to test whether none of the characters is contained in the word, so whether all list elements as shown in the output are true, not just any of them.

Answer 5

Try this

s = ["reddit","google"]
l = ["a","b","c","d"]
for str in s:
    if all(x not in str for x in l):
       print(str)