CODEWITHSUNDEEP
python
ajnachakra
ajnachakra

Reputation: 33

Finding a palindrome from anagrams

I am attempting to find palindromes from a generated list of anagrams. The twist here is that my initial input is a list of palindromes. I am essentially trying to automate a hunt for a palindrome that is an anagram of a palindrome (not homework, just an English nerd).

The original palindromes for input will come from 'pals.txt' where the palindromes are line-separated and have had spaces and non-numerical characters removed. I am using the British-English dictionary file 'dictionary.txt' to generate the anagrams.

I would appreciate any input as I am still very much a beginning programmer. Thank you!

def isPalindrome(s):
    return s.lower() == s[::-1].lower()

def anagramchk(word,chkword):
    for letter in word:
        if letter in chkword:
            chkword = chkword.replace(letter, '', 1)
        else:
            return 0
    return 1

f0 = open('pals.txt', 'r')
f1 = open('dictionary.txt', 'r')
for line in f0:
    wordin = line
    for line in f1:
        line = line.strip()
        if len(line) >= 4:
            if anagramchk(line, wordin):
                if isPalindrome(line):
                    print line
f0.close()
f1.close()

Upvotes: 3

Views: 1077

Answers (1)

inspectorG4dget
inspectorG4dget

Reputation: 113965

import collections

def isPalindrome(s):
    return s.lower() == s[::-1].lower()

def anagramchk(word,chkword):
    return sorted(word.lower()) == sorted(chkword.lower())

def allAnagrams(dictfilepath):
    answer = collections.defaultdict(list)
    with open(dictfilepath) as dictfile:
        for line in dictfile:
            word = line.strip().lower()
            answer[''.join(sorted(word))].append(word)
    return answer

def fetchAllAnagrams(wordin, anagrams):
    return anagrams[''.join(sorted(wordin.lower()))]

def main(dictfilepath, palsfilepath):
    anagrams = allAnagrams(dictfilepath)
    with open(palsfilepath) as palfile:
        for line in palfile:
            word = line.strip().lower()
            if isPalindrome(word):
                for anagram in anagrams[''.join(sorted(word))]:
                    if isPalindrome(anagram):
                        print "%s is an anagram of %s" %(anagram, word)

Suppose your filepaths are 'path/to/dictfile' and 'path/to/palsfile', then you could call main as follows:

main('path/to/dictfile', 'path/to/palsfile')

Hope this helps

Upvotes: 2

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