text stringlengths 1 81 | start float64 0 10.1k | duration float64 0 24.9 |
|---|---|---|
know it really isn't valid yeah thank | 251.319 | 4.601 |
you uh well pleas to you can type just | 253.879 | 4.88 |
to science science and that's it and it | 255.92 | 5.8 |
still be valid still be valid according | 258.759 | 5.841 |
to your program but the same exactly | 261.72 | 5.199 |
we've set a very low bar here in fact if | 264.6 | 4.76 |
I go ahead and rerun python of validate | 266.919 | 4.201 |
and I'll just type in one add sign | 269.36 | 4.2 |
that's it no username no domain name | 271.12 | 3.88 |
this doesn't really look like an email | 273.56 | 3.72 |
address but unfortunately my code thinks | 275 | 3.72 |
it in fact is because it's obviously | 277.28 | 3.759 |
just looking for an at sign alone well | 278.72 | 4.319 |
how could we improve this well minimally | 281.039 | 4.641 |
an email address I I think tends to have | 283.039 | 3.641 |
though this is not actually a | 285.68 | 3.2 |
requirement tends to have an at sign and | 286.68 | 4.239 |
a single dot at least maybe somewhere in | 288.88 | 5.48 |
the domain name so mailen harvard.edu so | 290.919 | 5.081 |
let's check for that dot as well though | 294.36 | 3.52 |
again strictly speaking doesn't even | 296 | 3.84 |
have to be that case but I'm going for | 297.88 | 3.4 |
my own email address at least for now as | 299.84 | 3.199 |
our test case so let me go ahead and | 301.28 | 3.84 |
change my code now and say not only if | 303.039 | 6.72 |
at is an email but also uh dot is in | 305.12 | 7 |
email as well so I'm asking now two | 309.759 | 4.921 |
questions I have two Boolean Expressions | 312.12 | 5.4 |
if at in email and I'm anding them | 314.68 | 5.16 |
together logically this is a logical and | 317.52 | 4.32 |
so to speak so if it's the case that at | 319.84 | 5 |
is an email and Dot is an email okay now | 321.84 | 4.88 |
I'm going to go ahead and say valid all | 324.84 | 3.6 |
right this would still seem to work for | 326.72 | 3.44 |
my email address let me go ahead and run | 328.44 | 5.44 |
python of validate dopy maen harbor. edu | 330.16 | 5.72 |
enter and that of course is valid as | 333.88 | 4.36 |
expected but here too we can be a little | 335.88 | 3.92 |
adversarial and type in something | 338.24 | 3.6 |
nonsensical like at Dot and | 339.8 | 3.839 |
unfortunately that too is going to be | 341.84 | 3.919 |
mistaken as valid even though there's | 343.639 | 4.241 |
still no username domain name or | 345.759 | 3.601 |
anything like that so I think we need to | 347.88 | 4.599 |
be a little more methodical here in fact | 349.36 | 6.76 |
notice that if I do this like this uh | 352.479 | 5.84 |
the at sign can be anywhere and the dot | 356.12 | 4.4 |
can be anywhere but if I assuming the | 358.319 | 3.44 |
user is going to have a traditional | 360.52 | 3.76 |
domain name like harvard.edu or | 361.759 | 4.921 |
gmail.com I really want to look for the | 364.28 | 5.039 |
dot in the domain name only not | 366.68 | 5.48 |
necessarily just the username so let me | 369.319 | 4.801 |
go ahead and do this let me go ahead and | 372.16 | 4.599 |
introduce a bit more logic here and | 374.12 | 5.84 |
instead do this let me go ahead and do | 376.759 | 4.321 |
uh | 379.96 | 4.239 |
email.it of quote unquote at sign so | 381.08 | 6.04 |
email again is a string or a stir stirs | 384.199 | 5 |
come with methods not just strip but | 387.12 | 4.16 |
also another one called split that as | 389.199 | 4.321 |
the name applies will split one stir | 391.28 | 3.96 |
into multiple ones if you give it a | 393.52 | 5.92 |
character or more to split on so this is | 395.24 | 5.679 |
hopefully going to return to me two | 399.44 | 3.199 |
parts from a traditional email address | 400.919 | 4.161 |
the username and the domain name and it | 402.639 | 4.601 |
turns out I can unpack that sequence of | 405.08 | 5.36 |
responses by doing this username comma | 407.24 | 6.12 |
domain equals this I could store it in a | 410.44 | 5.12 |
list or some other structure but if I | 413.36 | 4.16 |
already know in advance what kinds of | 415.56 | 3.479 |
values I'm expecting a username and | 417.52 | 3.32 |
hopefully a domain I'm going to go ahead | 419.039 | 3.201 |
and do it like this instead and just | 420.84 | 3.72 |
Define two variables at once on one line | 422.24 | 4.04 |
of code and now I'm going to be a little | 424.56 | 3.72 |
more precise if | 426.28 | 6.24 |
username uh uh if username then I'm | 428.28 | 7.12 |
going to go ahead and say print valid | 432.52 | 5.32 |
else I'm going to go ahead and say print | 435.4 | 4.68 |
invalid now this isn't good enough but | 437.84 | 3.84 |
I'm at least checking for the presence | 440.08 | 3.119 |
of a username now and you might not have | 441.68 | 3.359 |
seen this before but if you simply ask a | 443.199 | 4.4 |
question like if username and username | 445.039 | 5.521 |
is a string well usern if username is | 447.599 | 5.16 |
going to give me a true answer if | 450.56 | 4.759 |
username is anything except none or | 452.759 | 5.041 |
quote unquote nothing so there's a a | 455.319 | 4.921 |
truthy value here whereby if username | 457.8 | 4.36 |
has at least one character that's going | 460.24 | 3.799 |
to be considered true but if username | 462.16 | 4.24 |
has no characters it's going to be | 464.039 | 5.44 |
considered a false value effectively but | 466.4 | 4.32 |
this isn't good enough I don't want to | 469.479 | 2.961 |
just check for username I want to also | 470.72 | 4.72 |
check that it's the case that dot is in | 472.44 | 5.52 |
the domain name as well so notice here | 475.44 | 4.68 |
there's a bit of potential confusion | 477.96 | 4.76 |
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