I am trying to get the order of all files in the directory so I tried using sorted() function to sort the numeric value of each file which are respectively named folder/frame0.jpg
. The problem is I am getting an output that looks like this
yourlieinapril1/frame1094.jpg
yourlieinapril1/frame1095.jpg
yourlieinapril1/frame1096.jpg
yourlieinapril1/frame1097.jpg
yourlieinapril1/frame1098.jpg
yourlieinapril1/frame1099.jpg
yourlieinapril1/frame1100.jpg
yourlieinapril1/frame110.jpg
yourlieinapril1/frame1101.jpg
when ever it iterates through a base ten number the list goes back to a lesser number which I tried fixing with the following code but it still doesn't work well
def animate(folder):
l = list()
a = list()
for filename in os.listdir(folder):
path = (os.path.join(folder, filename))
if path.endswith('jpg'):
num = ''
for i in range(len(path)):
try:
p = int(path[i])
num += str(path[i])
except:
pass
try:
check = a[len(a) - 1]
if len(check) > len(num):
if num != '0':
num += ('0')
path = folder + '/frame' + num + '.jpg'
except:
pass
a.append(num)
l.append(path)
f = sorted(l)
f = list(dict.fromkeys(f))
does anyone have an idea of how I should do this?
Specify a key
parameter to sorted
to tell it how to sort the strings that's different from standard alphabetical comparison.
>>> files = [
... "yourlieinapril1/frame1094.jpg",
... "yourlieinapril1/frame1095.jpg",
... "yourlieinapril1/frame1096.jpg",
... "yourlieinapril1/frame1097.jpg",
... "yourlieinapril1/frame1098.jpg",
... "yourlieinapril1/frame1099.jpg",
... "yourlieinapril1/frame1100.jpg",
... "yourlieinapril1/frame110.jpg",
... "yourlieinapril1/frame1101.jpg",
... ]
>>> sorted(files, key=lambda s: int(s[21:-4]))
['yourlieinapril1/frame110.jpg', 'yourlieinapril1/frame1094.jpg', 'yourlieinapril1/frame1095.jpg', 'yourlieinapril1/frame1096.jpg', 'yourlieinapril1/frame1097.jpg', 'yourlieinapril1/frame1098.jpg', 'yourlieinapril1/frame1099.jpg', 'yourlieinapril1/frame1100.jpg', 'yourlieinapril1/frame1101.jpg']
If your real data set is more complicated (ie the leading non-numeric part is variable and you want to sort on that plus the numeric value), your key
function might instead do something like returning a tuple of the leading str
and the trailing int
.
You need to index the filenames by the number in the filename (by first extracting the number in the first place), and then zero-pad the number, and sort the index. Like this:
import os
def index_frames(folder):
indexed_files = {}
for filename in os.listdir(folder):
path = (os.path.join(folder, filename))
if path.endswith('jpg'):
# extract the number from the filename and pad with zeros so that they will sort correctly
num = ''.join([s for s in filename if s.isdigit()]).zfill(15)
# insert into a dict with key as padded number
indexed_files[num] = path
return indexed_files
index_frames = index_frames('yourlieinapril1')
for key in sorted(index_frames.keys()):
# these will print in order because they have been sorted by the index
print(index_frames[key])
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