List not appending

Question

I need to open a .txt file and iterate through it looking for a palindrome. My loop will iterate through the file but is not returning anything even though I know that there are palindromes in the file. It will only print out a bunch of empty brackets when I run it.

file = open("dictionary.txt", "r") 
lst = [] 
for word in file: 
    if(len(word) > 1 and word == word[::-1]): 
        lst = lst.append(word) 
    print(lst)

Answer 1

lst.append(word) appends the word to the list and doesn't return anything. Your code lst = lst.append(word) is appending the word to lst and overwriting it by assigning None which is returned by append .

Answer 2

You're indeed appending correctly, but getting the return value of the append statement, which is nonsense.

Replace the following line:

lst = lst.append(word)

by

lst.append(word)

And that's all.

Answer 3

You should strip your string. Moreover, append modifies the original list and returns None .

file = open("dictionary.txt", "r") 
lst = [] 
for word in file:
    word=word.strip()
    if(len(word) > 1 and word == word[::-1]): 
        lst.append(word) 
print(lst)

Answer 4

您必须将文件的内容分配给变量

var = file.read()