[Tutor] Req Assistance with 1st Project.

[Peter Otten]

Hello all,
I am working on my first Python project and I need some help. Here is what
my project is about. I want to be able to read in from a text file that
contains a list of IP addresses (maybe even hostnames) and write out each
IP in the list in the following format: "172.0.0.1" OR "10.10.10.10" OR
...... After some online search, It seems like I would want to create a
list (which I did) however, the challenge is that I can't figure out how
to add the double quotes and OR after each entry in my list.
f = open("BadIPList", "r+")
IOCs = []
line = line.strip()
IOCs.append(line)
print(IOCs)
f.close()
Thank you in advance.

Python has clever ways to achieve this, but you should first do it the hard
way:

- Just like you remove the whitespace from the line you can add something,
e. g. line = line + "!" will add an exclamation mark. In a similar way you
can add '"' before and after the line string.

- Instead of printing the whole list you can loop over the items:

for ioc in IOCs:
print("OR", ioc, end=" ")
print()

This will print the "OR" followed by an IP. There's one problem though,
there's an OR before the first IP. Can you avoid that with a flag (a
variable that is either True or False) and

... # init flag
for ioc in IOCs:
if ...: # check flag
... # update flag
else:
print("OR", end=" ")
print(ioc, end=" ")


OK, now for the clever way:

with open("BadIPList") as f:
print(" OR ".join('"{}"'.format(line.strip()) for line in f))

That may be concise, but is also a bit messy. To make it more readable you
can break it apart:

with open("BadIPList") as f:
ips = (line.strip() for line in f)
quoted_ips = ('"{}"'.format(ip) for ip in ips)
print(" OR ".join(quoted_ips))

The (... for ... in ...) is called "generator expression", a kind of
sequence that that lazily delivers items.

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