I just created a loop to read through each line in multiple files in Python and my code looks like this:
filenames = ["a.txt","b.txt","c.txt","d.txt"]
for file in filenames:
lines = [line.rstrip('\n') for line in open(file)]
However, Python only returns the contents of the last file (d.txt).
Can anyone help me here?
The problem is that lines is being overwrite on each iteration with the content of the actual file. Rakesh solution is valid, but I'm giving you other approach, as you are trying to do it in 1 line:
filenames = ["a.txt","b.txt","c.txt", "d.txt"]
lines = [line.rstrip('\n') for file in filenames for line in open(file)]
[...] section. You can't place them outside. Here you have a more detailed explanation about 1 line generator. Your version for this loop would be something like this: [print(r,c,file, line) for r in range(11) for c in range(5) for file in filenames for line in open(file)]