CODEWITHSUNDEEP
pythonpython-2.7liststrip
T. Green
T. Green

Reputation: 321

List has no attribute strip

I'm reading from a file and storing each character in a two dimensional array. I'm trying to get rid of the '\n' that comes at the end of each line. My code so far is:

l = []
for i in range(5):
    l.append([])
f = open('file.txt','r')
count = 0
for line in f:
    for char in line:
        l[count].append(char)
    count += 1

f.close()

l[0].rstrip('\n')

I have tried instead of the l[0].rstrip('\n'):

l = map(lambda s: s.strip('\n'), l) and l = [i.rstrip() for i in l ]

Each of these return the error that list has no attribute strip (or rstrip). Is there anyway to fix this?

Upvotes: 1

Views: 3057

Answers (1)

willeM_ Van Onsem
willeM_ Van Onsem

Reputation: 477309

l is a list of lists. So if you call l[0].rstrip() you can rstrip() on the sublist. But even if strip() would have worked, you would not have seen any difference since strings are immutable, and thus it will return a new string, not update the older one.

You can however easily use:

l[0] = [x.rstrip('\n') for x in l[0]]

to update only l[0].

If you want to update all the sublists, you can use the following list comprehension:

l = [[x.rstrip('\n') for x in s] for s in l]

Furthermore the code for reading your file into memory is quite weird: it will only work if the file has less than six lines. You can use the following approach:

with open('file.txt','r') as f:
    l = [list(line.rstrip('\n')) for line in f]

this replaces the entire code fragment in the question.

Upvotes: 2

Related Questions