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Need Help With a Function....

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Need Help With a Function....

 
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  #1
Aug 17th, 2008
Python Syntax (Toggle Plain Text) 
  1. def checkIt(arr,inp):
  2. 	bool = 0
  3. 	for i in arr:
  4. 		if i in inp:
  5. 			bool = 1
  6. 			break
  7. 	return bool
  8.  
  9. array = ['hi','hey','hello']
  10. string = "Hi there!"
  11.  
  12. if checkIt(array,string)
  13. 	print "Yay!";

That's my code. It returns, "Yay!". Now... I like what it does-- it searches the string for a value in an array, and if it finds it, returns true. However, if the string were "What a high mountain!", it would still return true. As you can see, in "high", the characters 'hi' can be found. I'd like it to search for a whole word, rather than a couple characters. How could I do this? Thanks!
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Re: Need Help With a Function....

 
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  #2
Aug 17th, 2008
You could add inp = list(inp) as the first line in your function.
Also you should avoid using names like 'bool', 'array' or 'string' (type or module names) as variable names
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Re: Need Help With a Function....

 
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  #3
Aug 17th, 2008
Thanks for your response--- I'll try it later.

What does list() do?
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Re: Need Help With a Function....

 
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  #4
Aug 17th, 2008
sorry, I meant inp.split() . The reason is that
python Syntax (Toggle Plain Text) 
  1. "hi" in ["What", "a", "high", "mountain"]
is False !
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Re: Need Help With a Function....

 
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  #5
Aug 17th, 2008
That works, but what if a value in the array is more than one word?

['hey there']
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Re: Need Help With a Function....

 
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  #6
Aug 18th, 2008
There is a solution with the re module. You can build a regular expression by joining all the elements of array
python Syntax (Toggle Plain Text) 
  1. array = ["hi", "hey there", "Hello world"]
  2. myPattern = re.compile("|".join([re.escape(w) for w in array]))
  3. checkIt = myPattern.search
  4.  
  5. if checkIt("foo bar buzz hey there, what are you doing?"):
  6.   print "Yay!"
However, I'm not sure its so efficient if the array is large. For example, if the elements of the array are sequences of words separated by white space, it could be better to look for all words and blocks of white space in the string...
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Re: Need Help With a Function....

 
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  #7
Aug 18th, 2008
What changes should I make to my function? You aren't very clear as to where..

Python Syntax (Toggle Plain Text) 
  1. def checkIt(arr,inp):
  2. 	inp = input.split(' ')
  3. 	bool = 0
  4. 	for i in arr:
  5. 		if i in inp:
  6. 			bool = 1
  7. 			break
  8. 	return bool
Last edited by Dekudude; Aug 18th, 2008 at 8:19 pm.
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Re: Need Help With a Function....

 
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  #8
Aug 18th, 2008
If you don't fully understand the re module (I don't), you could always have it look for the first word in that two-word value (in the array), and then if it found the first one, see if the word following it in the input is the same as the second word in the two-word value. Sorry if I didn't make that very clear. But anyways, I think that Gribouillis' idea would be the best, as it's straight-forward and clean looking.
Last edited by shadwickman; Aug 18th, 2008 at 11:02 pm.
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Re: Need Help With a Function....

 
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  #9
Aug 18th, 2008
If I merge array values into one array.. value.. what is the point of my function?
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Re: Need Help With a Function....

 
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  #10
Aug 18th, 2008
Let me get one thing straight: Are any of the array values ever going to be more than one word long? Because earlier in this thread you asked how to deal with it in that situation...
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