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How to properly import a selfsigned certificate into Java keystore that is available to all Java app
...e change is discarded.
Copy the file cacerts back where you found it.
On Linux:
You can download the SSL certificate from a web server that is already using it like this:
$ echo -n | openssl s_client -connect www.example.com:443 | \
sed -ne '/-BEGIN CERTIFICATE-/,/-END CERTIFICATE-/p' > /t...
How to create Android Facebook Key Hash?
...
For Linux and Mac
Open Terminal :
For Debug Build
keytool -exportcert -alias androiddebugkey -keystore debug.keystore | openssl sha1 -binary | openssl base64
You will find debug.keystore in the ".android" folder. Copy it an...
How to ignore xargs commands if stdin input is empty?
...uname -is
SunOS sun4v
$ xargs -n1 echo blah < /dev/null
$ uname -is
Linux x86_64
$ xargs --version | head -1
xargs (GNU findutils) 4.7.0-git
$ xargs -n1 echo blah < /dev/null
blah
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How to fix “Headers already sent” error in PHP
...
Strange thing, I moved my file from cPanel Linux Hosting to VPS. Before it was working properly but here it showed this error.(I had some html code before header). Why?
– Pablo Escobar
Apr 30 '17 at 19:36
...
Sort a list by multiple attributes?
...Or you can achieve the same using itemgetter (which is faster and avoids a Python function call):
import operator
s = sorted(s, key = operator.itemgetter(1, 2))
And notice that here you can use sort instead of using sorted and then reassigning:
s.sort(key = operator.itemgetter(1, 2))
...
Remove the first character of a string
...
python 2.x
s = ":dfa:sif:e"
print s[1:]
python 3.x
s = ":dfa:sif:e"
print(s[1:])
both prints
dfa:sif:e
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impr...
sqlite3.ProgrammingError: Incorrect number of bindings supplied. The current statement uses 1, and t
... treated as the input sequence. If that string is 74 characters long, then Python sees that as 74 separate bind values, each one character long.
>>> len(img)
74
>>> len((img,))
1
If you find it easier to read, you can also use a list literal:
cursor.execute('INSERT INTO images ...
Why does csvwriter.writerow() put a comma after each character?
...e that behavior. I get 2016-11-05 13:21:11 without quotes. What version of Python are you using?
– Laurence Gonsalves
Nov 5 '16 at 20:26
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Pure JavaScript Send POST Data Without a Form
... data back from a POST request.
JS (put in static/hello.html to serve via Python):
<html><head><meta charset="utf-8"/></head><body>
Hello.
<script>
var xhr = new XMLHttpRequest();
xhr.open("POST", "/postman", true);
xhr.setRequestHeader('Content-Type', 'applic...
How to estimate how much memory a Pandas' DataFrame will need?
...a to the discussion.
I ran a series of tests on this issue.
By using the python resource package I got the memory usage of my process.
And by writing the csv into a StringIO buffer, I could easily measure the size of it in bytes.
I ran two experiments, each one creating 20 dataframes of increasi...