Mini xkcd password generator

xkcd_password.py

#!/usr/bin/env python
import random
from urllib.request import urlopen

lines = urlopen(
    "https://raw.githubusercontent.com/first20hours/google-10000-english/master/google-10000-english-no-swears.txt"
)

words = list({
    line.decode("utf8").strip()
    for line in lines
    if len(line) > 6
})
print("Unique words:", len(words))
print("Possible passwords ~", len(words) ** 4)

for i in range(20):
    print("".join(random.sample(words, 4)))

How random is "random.sample"?

It's not 'cryptographically secure' random, but I'm assuming (perhaps wrongly) that it doesn't matter since this is for a local script, not a web application or something, so there should be no way for an attacker to get information about the state of the random number generator. Or if they do, you probably have bigger things to worry about.