text stringlengths 1 81 | start float64 0 10.1k | duration float64 0 24.9 |
|---|---|---|
and printing it out it's too late to | 1,286.52 | 4.44 |
sort I really need to read all of the | 1,288.98 | 4.559 |
lines first without printing them sort | 1,290.96 | 4.5 |
them then print them so we have to take | 1,293.539 | 3.961 |
a step back in order to add now now this | 1,295.46 | 4.14 |
new feature so how can I do this well | 1,297.5 | 4.14 |
let me combine some ideas from before | 1,299.6 | 4.319 |
let me go ahead and start fresh with | 1,301.64 | 4.26 |
this let me give myself a list called | 1,303.919 | 4.681 |
names and assign it an empty list just | 1,305.9 | 4.5 |
so I have a variable in which to | 1,308.6 | 4.02 |
accumulate all of these lines and now | 1,310.4 | 4.86 |
let me open the file with open quote | 1,312.62 | 4.98 |
unquote names.txt and it turns out I can | 1,315.26 | 4.02 |
tighten this up a little bit it turns | 1,317.6 | 3.24 |
out if you're opening a file to read it | 1,319.28 | 3.72 |
you don't need to specify quote unquote | 1,320.84 | 4.68 |
r that is the implicit default so you | 1,323 | 4.02 |
can tighten things up by just saying | 1,325.52 | 3.24 |
open names.text and you'll be able to | 1,327.02 | 4.019 |
read the file but not write it I'm going | 1,328.76 | 4.2 |
to give myself a variable called file as | 1,331.039 | 4.321 |
before I am going to iterate over the | 1,332.96 | 4.68 |
file in the same way for line in file | 1,335.36 | 5.28 |
but instead of printing each line I'm | 1,337.64 | 5.22 |
going to do this I'm going to take my | 1,340.64 | 5.1 |
names list and append to it and this is | 1,342.86 | 5.52 |
appending to a list in memory not | 1,345.74 | 5.22 |
appending to the file itself I'm going | 1,348.38 | 4.08 |
to go ahead and append the current line | 1,350.96 | 3.9 |
but I'm going to strip off the new line | 1,352.46 | 4.079 |
at the end so that all I'm adding to | 1,354.86 | 4.52 |
this list is each of the students names | 1,356.539 | 5.221 |
now I can use that familiar technique | 1,359.38 | 5.02 |
from before let me go outside of this | 1,361.76 | 4.32 |
with statement because now I've read the | 1,364.4 | 3.48 |
entire file presumably so by the time | 1,366.08 | 4.56 |
I'm done with lines four and five again | 1,367.88 | 4.26 |
and again and again for each line in the | 1,370.64 | 3.539 |
file I'm done with the file it can close | 1,372.14 | 4.14 |
I now have all of the students names in | 1,374.179 | 5.101 |
this list variable let me do this for | 1,376.28 | 7.019 |
name in not just names but the sorted | 1,379.28 | 6.72 |
names using our python function sorted | 1,383.299 | 5.281 |
which does just that and do print quote | 1,386 | 5.4 |
unquote with an F string hello comma and | 1,388.58 | 5.28 |
now I'll plug in bracket name | 1,391.4 | 5.7 |
so now what have I done I'm creating a | 1,393.86 | 4.74 |
list at the beginning just so I have a | 1,397.1 | 3.9 |
place to gather my data I then on lines | 1,398.6 | 4.26 |
three through five iterate over the file | 1,401 | 4.26 |
from top to bottom reading in each line | 1,402.86 | 4.08 |
one at a time stripping off the new line | 1,405.26 | 3.299 |
and adding just the student's name to | 1,406.94 | 3.599 |
this list and the reason I'm doing that | 1,408.559 | 4.98 |
is so that on line seven I can sort all | 1,410.539 | 4.681 |
of those names now that they're all in | 1,413.539 | 4.561 |
memory and print them in order I need to | 1,415.22 | 4.86 |
load them all into memory before I can | 1,418.1 | 3.84 |
sort them otherwise I'd be printing them | 1,420.08 | 3.719 |
out prematurely and Draco would end up | 1,421.94 | 4.14 |
last instead of first so let me go ahead | 1,423.799 | 4.141 |
in my terminal window and run python of | 1,426.08 | 5.04 |
names.pi now and hit enter and there we | 1,427.94 | 6.119 |
go the same list of four hellos but now | 1,431.12 | 4.919 |
they're sorted and this is a very common | 1,434.059 | 4.081 |
technique when dealing with files and | 1,436.039 | 3.721 |
information more generally if you want | 1,438.14 | 4.26 |
to change that data in some way like | 1,439.76 | 4.799 |
sorting it creating some kind of | 1,442.4 | 3.779 |
variable at the top of your program like | 1,444.559 | 3.72 |
a list adding or appending information | 1,446.179 | 4.261 |
to it just to collect it in one place | 1,448.279 | 4.441 |
and then do something interesting with | 1,450.44 | 4.5 |
that collection that list is exactly | 1,452.72 | 4.38 |
what I've done here now I should note | 1,454.94 | 4.14 |
that if we just want to sort the file we | 1,457.1 | 3.84 |
can actually do this even more simply in | 1,459.08 | 3.959 |
Python particularly by not bothering | 1,460.94 | 4.68 |
with this names list nor the second for | 1,463.039 | 4.14 |
Loop and let me go ahead and instead | 1,465.62 | 3.539 |
just do more simply this let me go ahead | 1,467.179 | 3.781 |
and tell python that we want the file | 1,469.159 | 4.02 |
itself to be sorted using that same | 1,470.96 | 4.199 |
sorted function but this time on the | 1,473.179 | 4.201 |
file itself and then inside of that for | 1,475.159 | 3.721 |
Loop let's just go ahead and print right | 1,477.38 | 4.26 |
away our hello comma followed by the | 1,478.88 | 4.679 |
line itself but still stripping off of | 1,481.64 | 4.68 |
the end of it any white space therein if | 1,483.559 | 4.261 |
we go ahead and run this same program | 1,486.32 | 4.02 |
now with pythonupnames.pi and hit enter | 1,487.82 | 4.26 |
we get the same result but of course | 1,490.34 | 4.14 |
it's a lot more compact but for the sake | 1,492.08 | 4.68 |
of discussion let's assume that we do | 1,494.48 | 4.5 |
actually want to potentially make some | 1,496.76 | 3.96 |
changes to the data as we iterate over | 1,498.98 | 3.48 |
it so let me undo those changes leave | 1,500.72 | 3.72 |
things as is where by now we'll continue | 1,502.46 | 3.719 |
to accumulate all of the names first | 1,504.44 | 3.719 |
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