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Delete column from pandas DataFrame
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As you've guessed, the right syntax is
del df['column_name']
It's difficult to make del df.column_name work simply as the result of syntactic limitations in Python. del df[name] gets translated to df.__delitem__(name) under the covers by Python.
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Best way to do multiple constructors in PHP
You can't put two __construct functions with unique argument signatures in a PHP class. I'd like to do this:
21 Answers
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How to uninstall the “Microsoft Advertising SDK” Visual Studio extension?
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Run the following from an elevated Powershell prompt:
gwmi Win32_Product -Filter "Name LIKE 'Microsoft Advertising%'"
And it should show the culprits:
IdentifyingNumber : {6AB13C21-C3EC-46E1-8009-6FD5EBEE515B}
Name : Microsoft Advertising SDK for Windows 8.1 - ENU
Vendor ...
Bash set +x without it being printed
..._off
echo "status: $?"
trace_on
(exit 56)
trace_off
When executed:
$ ./test.sh
+ echo hello
hello
status: 0
+ exit 56
status: 56
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Argparse optional positional arguments?
...NDER and nargs='*', as it seems to me, they are identical in their effect (tested in Python 2.7.10 and Python 3.6.1)?
– user8554766
Aug 8 '18 at 11:49
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Linux下部署企业级邮件服务器(postfix + dovecot + extmail) - 开源 & Gith...
...-HiRes-1.9707.tar.gz
cd Time-HiRes-1.9707
perl Makefile.PL
make
make test
make install
2、安装File::Tail
tar zxvf File-Tail-0.99.3.tar.gz
cd File-Tail-0.99.3
perl Makefile.PL
make
make test
make install
3、安装rrdtool-1.2.23
yum install -y libpng-devel freetype
tar zxvf r...
Eclipse: have the same file open in two editors?
...ristopherStock on Eclipse-Juno, you can open Window -> New Editor. I've tested on my eclipse juno! :D
– Tuan
Sep 9 '13 at 15:00
2
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Representing graphs (data structure) in Python
... both ways). We'll handle that by adding a directed parameter to the Graph.__init__ method. We'll also add some other helpful methods.
import pprint
from collections import defaultdict
class Graph(object):
""" Graph data structure, undirected by default. """
def __init__(self, connection...
error LNK2019: unresolved external symbol _WinMain@16 referenced in function ___tmainCRTStartup
...you can just hint at what your entry point is, because you haven't defined ___tmainCRTStartup. You can do this by adding the following to Properties -> Linker -> Command line:
/ENTRY:"mainCRTStartup"
This way you get rid of the console window.
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Calling a function of a module by using its name (a string)
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Assuming module foo with method bar:
import foo
method_to_call = getattr(foo, 'bar')
result = method_to_call()
You could shorten lines 2 and 3 to:
result = getattr(foo, 'bar')()
if that makes more sense for your use case.
You can use getattr in this fashion on class insta...