CODEWITHSUNDEEP
python-2.7find
user2420437
user2420437

Reputation: 217

Finding out exact match in python

I'm trying to find out a string from list. Here's the code:

    wordlist = ['gedit','leafpad','qstardict','stardict']

    letters = str('stardict')

    for item in wordlist:
        if item.find(letters) != -1:
            print item

It's showing 'qstardict' first and then 'stardict'. But I want it to show 'stardict' first. Please help me.

Upvotes: 0

Views: 217

Answers (2)

Joachim Isaksson
Joachim Isaksson

Reputation: 180917

EDIT: A last attempt to do what you're asking, if this is not what you want, please update the question with a complete description of what you need help with;

This gets all words that start with your substring, in alphabetical order;

result = sorted(x for x in wordlist if x.startswith(letters))

Upvotes: 1

eyquem
eyquem

Reputation: 27575

This ?

wordlist = ['stardictionaries','hop','stardicto',
            'stardictionaria', 'jumper',
            'gedit','leafpad','qstardict',
            'stardictionary','stardict',]

def seurch1(deb,wordlist):
    for item in wordlist:
        if item.startswith(deb):
            yield item

def seurch2(deb,wordlist):
    L = len(deb)
    for item in wordlist:
        if item[0:L]==deb:
            yield item

from pprint import pprint

pprint( list(seurch1('stardict',wordlist)) )
print
pprint( sorted(seurch1('stardict',wordlist),key=len) )  

print '--------------------'

pprint( list(seurch2('stardict',wordlist)) )
print
pprint( sorted(seurch2('stardict',wordlist),key=len) )

I think that seurch2() is faster

result

['stardictionaries',
 'stardicto',
 'stardictionaria',
 'stardictionary',
 'stardict']

['stardict',
 'stardicto',
 'stardictionary',
 'stardictionaria',
 'stardictionaries']
--------------------
['stardictionaries',
 'stardicto',
 'stardictionaria',
 'stardictionary',
 'stardict']

['stardict',
 'stardicto',
 'stardictionary',
 'stardictionaria',
 'stardictionaries']

Edit

seurch1() and seurch2() are two functions that do exactly the same thing.
They are generator functions because of the presence of the keyword yield instead of return in them.
They act as iterators: they yield an element each time a call is done, as in: 

for el in seurch2('stardict',wordlist):
    print el

But list(seurch2('stardict',wordlist)) calls all the yielded elements in one shot and returns them in a list.

If you want to sort in alphabetical order, simply do:

sorted( seurch2('stardict',wordlist) )

because the elements are then sorted on the basis of their string value, and 

print 'bc' < 'ba'
# False
print 'bc' < 'bda'
# True
print 'bcxyzterry' < 'bda'
# True

Upvotes: 1

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