Re: Best use of "open" context manager

On 06Jul2024 11:49, Rob Cliffe <rob.cliffe@btinternet.com> wrote:

try:
    f = open(FileName) as f:
    FileLines = f.readlines()
except FileNotFoundError:
    print(f"File {FileName} not found")
    sys.exit()
# I forgot to put "f.close()" here -:)
for ln in File Lines:
        print("I do a lot of processing here")
        # Many lines of code here .....

What about this:
     try:
         f = open(FileName) as f:
     except FileNotFoundError:
         print(f"File {FileName} not found")
         sys.exit()
     with f:
         ... process the lines here ...
Remember, the `open()` call returns a file object _which can be used as a context manager_. It is separate from the `with` itself.