Datasets:
pre-view
/
CS50-raw

Dataset card Data Studio Files
xet
 Community
1
text
stringlengths
1
81
start
float64
0
10.1k
duration
float64
0
24.9
in this file I'm going to go ahead and
1,954.08
5.339
do this for line and file as before and
1,955.58
5.819
now I have to be a bit clever here let
1,959.419
4.921
me go back to students.csv looking at
1,961.399
5.4
this file and it seems that on my loop
1,964.34
4.199
on each iteration I'm going to get
1,966.799
4.74
access to the whole line of text I'm not
1,968.539
4.62
going to automatically get access to
1,971.539
4.38
just Hermione or just Gryffindor recall
1,973.159
4.441
that the loop is going to give me each
1,975.919
4.681
full line of text so logically what
1,977.6
5.28
would you propose that we do inside of a
1,980.6
4.26
for Loop that's reading a whole line of
1,982.88
3.539
text at once but we now want to get
1,984.86
3.9
access to the individual values like
1,986.419
4.681
Hermione and Gryffindor Harry and
1,988.76
4.799
Gryffindor how do we go about taking one
1,991.1
4.439
line of text and gaining access to those
1,993.559
3.48
individual values do you think just
1,995.539
3.24
instinctively even if you're not sure
1,997.039
3.48
what the name of the functions would be
1,998.779
4.561
you can access access it as you would
2,000.519
4.561
and if you were using a dictionary like
2,003.34
3.3
using a key and value
2,005.08
3.54
so ideally we would access it using it a
2,006.64
3.419
key in value but at this point in the
2,008.62
3.84
story all we have is this Loop and this
2,010.059
4.921
Loop is giving me one line of text that
2,012.46
4.38
is the time I'm the programmer now I
2,014.98
3.059
have to solve this there is no
2,016.84
3.24
dictionary yet in question about another
2,018.039
3.901
suggestion here
2,020.08
4.319
um so you can somehow split the two
2,021.94
5.219
words based on the comma yeah even if
2,024.399
4.561
you're not quite sure what function is
2,027.159
3.541
going to do this intuitively you want to
2,028.96
3.24
take this whole line of text Hermione
2,030.7
4.02
comma Gryffindor Harry comma Gryffindor
2,032.2
5.04
and so forth and split that line into
2,034.72
4.5
two pieces if you will and it turns out
2,037.24
3.419
wonderfully the function we'll use is
2,039.22
3.72
actually called split that can split on
2,040.659
4.38
any characters but you can tell it what
2,042.94
3.9
character to use so I'm going to go back
2,045.039
4.741
into students.pi and inside of this Loop
2,046.84
4.319
I'm going to go ahead and do this I'm
2,049.78
3.359
going to take the current line I'm going
2,051.159
4.2
to remove the white space at the end as
2,053.139
4.5
always using R strip here and then
2,055.359
4.141
whatever the result of that is I'm going
2,057.639
4.861
to now call split and quote unquote
2,059.5
6.24
comma so the split function or method
2,062.5
6.839
comes with strings stirs in Python any
2,065.74
6.659
stir has this method built in and if you
2,069.339
5.461
pass in an argument like a comma what
2,072.399
4.68
this strip split function will do is
2,074.8
4.68
split that current string into one two
2,077.079
5.1
three maybe more pieces by looking for
2,079.48
4.8
that character again and again
2,082.179
5.641
ultimately strip uh ultimately split is
2,084.28
5.639
going to return to us a list of all of
2,087.82
4.079
the individual parts to the left and to
2,089.919
4.321
the right of those commas so I can give
2,091.899
4.381
myself a variable called row here and
2,094.24
3.72
this is a common Paradigm when you know
2,096.28
3.18
you're iterating over a file
2,097.96
4.5
specifically a CSV it's common to think
2,099.46
6.6
of each line of it as being a row and
2,102.46
5.52
each of the values they're in separated
2,106.06
4.74
by commas as columns so to speak so I'm
2,107.98
4.5
going to deliberately name my variable
2,110.8
3.42
row just to be consistent with that
2,112.48
4.2
convention and now what do I want to
2,114.22
4.379
print well I'm going to go ahead and say
2,116.68
5.939
this print how about the following in F
2,118.599
7.081
string that starts with curly braces
2,122.619
6
well how do I get access to the first
2,125.68
4.98
thing in that row well the row is going
2,128.619
4.201
to have how many parts two because if
2,130.66
4.02
I'm splitting on commas and there's one
2,132.82
3.96
comma per line that's going to give me a
2,134.68
3.96
left part and a right part like Hermione
2,136.78
4.92
and Gryffindor Harry and Gryffindor when
2,138.64
5.459
I have a list like row how do I get
2,141.7
4.8
access to individual values well I can
2,144.099
6.421
do this I can say Row Bracket zero and
2,146.5
5.64
that's going to go to the first element
2,150.52
3.12
of the list which should hopefully be
2,152.14
3.959
the student's name then after that I'm
2,153.64
4.26
going to say is in and I'm going to have
2,156.099
5.281
another curly brace here for Row Bracket
2,157.9
5.34
one and then I'm going to close my whole
2,161.38
3.84
quote so it looks a little cryptic at
2,163.24
3.54
first glance but most of this is just F
2,165.22
3.899
string syntax with curly braces to plug
2,166.78
4.319
in values and what values am I plugging
2,169.119
4.74
in well rho again is a list and it has
2,171.099
5.581
two elements presumably Hermione in one
2,173.859
4.74
and Gryffindor and the other and so
2,176.68
4.8
forth so bracket zero is the first
2,178.599
4.321