Function call doesnt work python

Question

Im trying to print palindrome words in a file (where each line is a word) in python. Thats what I have so far: I have to work in Unix so I wrote my script in file palindrome.py as below:

#!/usr/bin/python

def isPalindrome(a):
    if a == a[::-1]:
        print a

with open ('fileName') as f:
   for line in f:
       isPalindrome(line)

When I run the file it doesn't print anything even-though there are palindrome words in my file. I think the problem is related to my function call because if instead of isPalindrome(line) I have isPalindrome('aha') it will print aha. I tried to print each line after the for loop but that works as well. It does print all the lines of the file. So line does get different values so I guess there might be something related to the call but I am failing to find out what.

Benjamin Hodgson · Accepted Answer · 2016-04-16 17:04:20Z

6

You need to strip newlines from the end of your lines. Try call as isPalindrome(line.strip()).

edited Apr 16, 2016 at 17:04

Benjamin Hodgson

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answered Apr 16, 2016 at 17:03

Demur Rumed

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2 Comments

wallyk Over a year ago

Might also be useful to ignore case differences.

lnk2012 Over a year ago

Thanks for your help.

Vincent · Accepted Answer · 2016-04-16 17:17:01Z

1

Attention: file.readlines() does not wrap end line characters!!

so if in you file you have aha in one line, the line will be aha\n (with the new line char...)...

I suggest use of replace() string method.

Your code:

#!/usr/bin/python

def isPalindrome(a):
    if a == a[::-1]:
        print a

with open ('fileName') as f:
   for line in f:
       isPalindrome(line.replace('\n', '').replace("\r", "")) # replace carriage return / line feed chars

edited Apr 16, 2016 at 17:17

answered Apr 16, 2016 at 17:04

Vincent

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2 Comments

lnk2012 Over a year ago

Thank you. It worked with the file.readlines() as well but I will need to find the words length as well so this was helpful.

Vincent Over a year ago

len(word) . to get the length of a string

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