<div dir="ltr">Hi,<div><br></div><div>The following code tries to generate some dummy data for regex exercises. My question is in reference the line before last:</div><div><br></div><div><div> dom="".join(choice(lc) for j in range (dlen))</div>
<br class="Apple-interchange-newline"></div><div>how does the interpreter know what "j" is supposed to refer to when it was not mentioned prior?</div><div><br></div><div><br></div><div><div>from random import randrange, choice</div>
<div>from string import ascii_lowercase as lc</div><div>from sys import maxsize</div><div>from time import ctime</div><div><br></div><div>tlds = ('com', 'edu', 'net', 'org', 'gov')</div>
<div><br></div><div>for i in range(randrange(5,11)):</div><div> dtint=randrange(maxsize) #pick a random number to use to generate random date in next line</div><div> dtstr=ctime(dtint) #date string</div>
<div> llen=randrange(4,8) #login is shorter</div><div> login=''.join(choice(lc) for j in range(llen))</div><div> dlen=randrange(llen,13) #domain is longer</div><div> dom="".join(choice(lc) for j in range (dlen))</div>
<div> print('{}::{}@{}.{}::{}-{}-{}'.format(dtstr,login,dom,choice(tlds),dtint,llen,dlen))</div><div> </div><div><br></div></div></div>