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Applying function with multiple arguments to create a new pandas column
...f = pd.DataFrame({"A": [10,20,30], "B": [20, 30, 10]})
>>> df['new_column'] = np.multiply(df['A'], df['B'])
>>> df
A B new_column
0 10 20 200
1 20 30 600
2 30 10 300
or vectorize arbitrary function in general case:
>>> def fx(x, y):
...
What actually causes a Stack Overflow error? [duplicate]
...t pc=0x00007f4822f9d501, pid=4988, tid=139947823249152
#
# JRE version: 6.0_27-b27
# Java VM: OpenJDK 64-Bit Server VM (20.0-b12 mixed mode linux-amd64 compressed oops)
# Derivative: IcedTea6 1.12.6
# Distribution: Ubuntu 10.04.1 LTS, package 6b27-1.12.6-1ubuntu0.10.04.2
# Problematic frame:
# V [l...
How to convert JSON to CSV format and store in a variable
...
Output:
title,description,link,timestamp,image,embed,language,user,user_image,user_link,user_id,geo,source,favicon,type,domain,id
"Apple iPhone 4S Sale Cancelled in Beijing Amid Chaos (Design You Trust)","Advertise here with BSA Apple cancelled its scheduled sale of iPhone 4S in one of its store...
Git Extensions: Win32 error 487: Couldn't reserve space for cygwin's heap, Win32 error 0
...ll 64-bit Git for Windows 2.
Technical details
0 [main] us 0 init_cheap: VirtualAlloc pointer is null, Win32 error 487
AllocationBase 0x0, BaseAddress 0x68570000, RegionSize 0x2A0000, State 0x10000
PortableGit\bin\bash.exe: *** Couldn't reserve space for cygwin's heap, Win32 error 0
This...
How should I use try-with-resources with JDBC?
...g in the outer try:
try (Connection con = DriverManager.getConnection(JDBC_URL, prop);
PreparedStatement stmt = ((Supplier<PreparedStatement>)() -> {
try {
PreparedStatement s = con.prepareStatement("SELECT userid, name, features FROM users WHERE userid = ?");
s.set...
Python list iterator behavior and next(iterator)
... a = iter(list(range(10)))
>>> for i in a:
... print(i)
... _ = next(a)
...
0
2
4
6
8
or print extra information to differentiate the print() output from the interactive interpreter echo:
>>> a = iter(list(range(10)))
>>> for i in a:
... print('Printing: {}'.f...
How to sort an array in descending order in Ruby
... { ary.sort{ |a,b| a[:bar] <=> b[:bar] }.reverse } }
x.report("sort_by -a[:bar]") { n.times { ary.sort_by{ |a| -a[:bar] } } }
x.report("sort_by a[:bar]*-1") { n.times { ary.sort_by{ |a| a[:bar]*-1 } } }
x.report("sort_by.reverse!") { n.times { ary.sort_by{ |a| a[:bar] }.reverse } }
e...
How to render and append sub-views in Backbone.js
...= SubView.extend({
tagName: "tr",
className: "part",
template: _.template($("#part-row-template").html())
});
var PartListView = ViewCollection.extend({
el: $("table#parts"),
subViewClass: PartView
});
...
Rails: Using build with a has_one association in rails
... later on create a profile for that user. I tried using build with a has_one association but that blew up. The only way I see this working is using has_many . The user is supposed to only have at most one profile .
...
Diff output from two programs without temporary files
...
One option would be to use named pipes (FIFOs):
mkfifo a_fifo b_fifo
./a > a_fifo &
./b > b_fifo &
diff a_fifo b_fifo
... but John Kugelman's solution is much cleaner.
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