anyone please explain second line of this code....

Question

for dirpath, dirnames, filenames in os.walk(r"C:\Users\Documents\MP3"):
for filename in [f for f in filenames if f.endswith(".mp3")]:
print(filename)
anyone please explain...why two times "f" is required inside the square brackets(f for f) ... thank you in advance:)

Answer 1

That's a list comprehension. [x for x in list] creates a new list and adds all elements of "list" without any changes. If you use something like [x.upper() for x in list], the list will contain an uppercase version of each element, [x[0] for x in list] will only contain the first letter of each element etc.

Your example will create a list of all file names in the specified folder that end with '.mp3'.

https://www.sololearn.com/learn/JUMP_LINK__&&__Python__&&__JUMP_LINK/2454/

Answer 2

thank you very much Anna