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String literals and escape characters in postgresql
...and run the command \copy xxxxxxxxxxx FROM /support01/db/data/xxxxxxxxx_7F.txt DELIMITER AS E'\x7f', I get parse error at "'\x7f'". If I have the standard_conforming_strings=off; and use the same command above without the E and the Quotes... ( DELIMITER AS \x7f) I get the warning message, but the da...
Saving utf-8 texts in json.dumps as UTF8, not as \u escape sequence
...To write to a file
import codecs
import json
with codecs.open('your_file.txt', 'w', encoding='utf-8') as f:
json.dump({"message":"xin chào việt nam"}, f, ensure_ascii=False)
To print to stdout
import json
print(json.dumps({"message":"xin chào việt nam"}, ensure_ascii=False))
...
What's the algorithm to calculate aspect ratio?
...d.com/hwsurvey, section 'Primary Display Resolution'
steam_file = './steam.txt'
# Taken from http://upload.wikimedia.org/wikipedia/commons/thumb/f/f0/Vector_Video_Standards4.svg/750px-Vector_Video_Standards4.svg.png
accepted_ratios = ['5:4', '4:3', '3:2', '8:5', '5:3', '16:9', '17:9']
#-----------...
What is a memory fence?
...in the Linux kernel source documentation, at Documentation/memory-barriers.txt.
Most of the time, it's best to use locking primitives from your compiler or standard library; these are well tested, should have all the necessary memory barriers in place, and are probably quite optimized (optimizi...
Understand the “Decorator Pattern” with a real world example
...utStream classes in java.io package
File file=new File("target","test.txt");
FileOutputStream fos=new FileOutputStream(file);
BufferedOutputStream bos=new BufferedOutputStream(fos);
ObjectOutputStream oos=new ObjectOutputStream(bos);
oos.write(5);
oos.writeBoolean(true);
...
Output array to CSV in Ruby
...assuming us_eco contains the CSV table as from my gist.
CSV.open('outfile.txt','wb', col_sep: "\t") do |csvfile|
csvfile << us_eco.first.keys
us_eco.each do |row|
csvfile << row.values
end
end
Updated the gist at https://gist.github.com/tamouse/4647196
...
gunicorn autoreload on source change
... /path/to/virtualenv/activate
pip install -r /path/to/project/requirements.txt
python /path/to/project/manage.py migrate
sudo supervisorctl restart project_name
Make sure to chmod u+x post-receive, and add user to sudoers. Allow it to run sudo supervisorctl without password. https://www.cybercit...
What's the difference between Perl's backticks, system, and exec?
...reted by the shell, use only if you
#want the shell to do globbing (e.g. *.txt) for you or you want to redirect
#output
system("command arg1 arg2 arg3");
qx// or ``: run a command and capture its STDOUT
Use qx// when you want to run a command, capture what it writes to STDOUT, and don't want the ...
Android encryption / decryption using AES [closed]
... "/" + getPackageName();
File file = new File(homeDirName, "test.txt");
byte[] keyBytes = getKey("password");
try {
File dir = new File(homeDirName);
if (!dir.exists())
dir.mkdirs();
if (!file.exists())
fi...
What is the difference between save and export in Docker?
...
so, an export is similar to a txt file with nothing written on it right?? @neil
– AATHITH RAJENDRAN
Feb 25 '19 at 4:11
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