How To Improve Searching With Os.walk And Fnmatch
I'm using os.walk and fnmatch with filters to search a pc's hdd for all image files. This works perfectly fine but is extremely slow since it takes about 9 minutes to search +-7000
Solution 1:
I'm not one of those regex maniacs who always resorts to the re
hammer to solve all problems, but this actually ran a wee bit over twice as fast in my tests as your fnmatch version:
import os
import re
matches = []
img_re = re.compile(r'.+\.(jpg|png|jpeg|tif|tiff)$', re.IGNORECASE)
for root, dirnames, filenames in os.walk(r"C:\windows"):
matches.extend(os.path.join(root, name) for name in filenames if img_re.match(name))
Solution 2:
The Python looks pretty much ok to me.
You could experiment with
for root, dirnames, filenames inos.walk("C:\\"):
for extension in extensions:
matches.extend(os.path.join(root, filename) for filename
in fnmatch.filter(filenames, extension))
If that does not make a difference (I suppose it will not), I believe your harddisk has become the bottleneck in the process (remember, disk == slow and you're iterating over and listing the files of every directory in your system).
If the harddisk is the bottleneck, the results from multiple dir /s ...
statements should definitely not be extravagantly faster than the Python solution.
Solution 3:
import os
extns = ('.jpg', '.jpeg', '.png', '.tif', '.tiff')
matches = []
for root, dirnames, fns inos.walk("C:\\"):
matches.extend(
os.path.join(root, fn) for fn in fns if fn.lower().endswith(extns)
)
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