I have some txt files in a directory and I need to get the last 15 lines from all of them. How could I do it using python?
I chose this code:
from os import listdir
from os.path import isfile, join
dir_path= './'
files = [ f for f in listdir(dir_path) if isfile(join(dir_path,f)) ]
out = []
for file in files:
filedata = open(join(dir_path, file), "r").readlines()[-15:]
out.append(filedata)
f = open(r'./fin.txt','w')
f.writelines(out)
f.close()
but I get the error "TypeError: writelines() argument must be a sequence of strings". I think it's because of Russian letters in the lines.
import os
from collections import deque
for filename in os.listdir('/some/path'):
# might want to put a check it's actually a file here...
# (join it to a root path, or anything else....)
# and sanity check it's text of a usable kind
with open(filename) as fin:
last_15 = deque(fin, 15)
deque
will automatically discard the oldest entry and peak the max size to be 15, so it's an efficient way of keeping just the "last" 'n' items.
Try this:
from os import listdir
from os.path import isfile
for filepath in listdir("/path/to/folder")
if isfile(filepath): # if need
last_five_lines = open(filepath).readlines()[-15:]
# or, one line:
x = [open(f).readlines()[-15:] for f in listdir("/path/to/folder") if isfile(f)]
Updated:
lastlines = []
for file in files:
lastlines += open(join(dir_path, file), "r").readlines()[-15:]
with open('./fin.txt', 'w') as f:
f.writelines(lastlines)
from os import listdir
from os.path import isfile, join
dir_path= '/usr/lib/something'
files = [ f for f in listdir(dir_path) if isfile(join(dir_path,f)) ]
for file in files:
filedata = open(join(dir_path, file), "r").readlines()[-15:]
#do something with the filedata
Hope this helps:
import os
current_dir = os.getcwd()
dir_objects = os.listdir(current_dir)
dict_of_last_15 = {}
for file in dir_objects:
file_obj = open(file, 'rb')
content = file_obj.readlines()
last_15_lines = content[-15:]
dict_of_last_15[file] = last_15_lines
print "#############: %s" % file
print dict_of_last_15[file]
file_to_check.close()
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