Something from string in list python

Question

I have a list with keywords id = ['pop','ppp','cre'] and now I am going through a bunch of files/large strings and if any of these keywords are in these files than I have to be able to do something...

like:

id = ['pop','ppp','cre']
if id in dataset:
         print id

But i think now all of these 3 or later maybe more have to be in the dataset and not just only one.

Do you want to match any of the keywords in id, or all of the keywords in id? — Patrick
– Patrick, Commented Aug 18, 2011 at 11:36
@Jasper: You shouldn't use id as a variable name, since it shadows the builtin function id(). — pillmuncher
– pillmuncher, Commented Aug 18, 2011 at 12:15

Brent Newey · Accepted Answer · 2011-08-18 11:27:25Z

1

You can use all to make sure all the values in your id list are in the dataset:

id = ['pop', 'ppp', 'cre']
if all(i in dataset for i in id):
    print id

answered Aug 18, 2011 at 11:27

Brent Newey

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5 Comments

Patrick Over a year ago

The question specifies that any, not all, should be in the dataset

Brent Newey Over a year ago

"But i think now all of these 3 or later maybe more have to be in the dataset and not just only one."

Patrick Over a year ago

"if any of these keywords are in these files than I have to be able to do something". I think that quote refers to what he believes his current code is doing.

Brent Newey Over a year ago

... yes, which is in fact the problem that needs solving.

Patrick Over a year ago

I'll ask him to clarify. We are clearly understanding his problem statement differently.

Artsiom Rudzenka · Accepted Answer · 2011-08-18 11:29:07Z

1

Since you mentioned that you need to check any word within dataset then I think any() built-in method will help:

if any(word in dataset for word in id):
    # do something

Or:

if [word for word in id if word in dataset]:
    # do something

And:

if filter(lambda word: word in dataset, id):
    # do something

answered Aug 18, 2011 at 11:29

Artsiom Rudzenka

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Comments

Patrick · Accepted Answer · 2011-08-18 11:49:19Z

1

Your code as it stands will actually look through dataset for the entire list "['pop', 'ppp', 'cre']". Why don't you try something like this:

for item in id:
    if item in dataset:
        print id

Edit:

This will probably be more efficient:

for item in dataset:
    if item in id:
        print id

Assuming |dataset| > |id| and you break out of the loop when you find a match.

edited Aug 18, 2011 at 11:49

answered Aug 18, 2011 at 11:27

Patrick

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6 Comments

Brent Newey Over a year ago

He says dataset is a bunch of files/large strings. I'm not sure that iterating over it will be helpful.

Patrick Over a year ago

Look at the documentation for all(): docs.python.org/library/functions.html?highlight=any#all , that's exactly what the function does. How would you propose to check if an element is in dataset without iterating over it?

Brent Newey Over a year ago

Iterating over a string returns the values one character at a time. So no, that's not going to work.

Patrick Over a year ago

Its iterating over a "bunch of files/large strings", as you said, not a string.

Brent Newey Over a year ago

OK, so if it's a list of strings how is that better? You're checking if the whole large string is in id?

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