Linux Ask! is a Q & A web site specific for Linux related questions. Questions are collected, answered and audited by experienced Linux users.
Print to standard output in different scripting languages
Answer:
To print a string of "Hello World" to the standard output in different scripting languages
1. Perl
print "Hello, World!";
2. Python
print('Hello, World!')
3. PHP
echo "Hello, World!";
4. Ruby
puts "Hello, World!"
Add Personal Package Archives (PPA) to the current repository in Ubuntu
Answer:
add-apt-repository is a helper script which adds an external APT repository to either /etc/apt/sources.list or a file in /etc/apt/sources.list.d/. It can also import the keys needed.
To get this tool, just a single command:
# sudo apt-get install python-software-properties
That is it.
Render web page using PyQt
Answer:
Qt bindings to WebKit have been added since 4.4, so you can use PyQt to script the browser (Webkit based).
Firstly, make sure you have installed the need packages:
# sudo apt-get install libqt4-core libqt4-webkit python-qt4
Then you can write a simple script to test, e.g.
#!/usr/bin/env python
import sys
from PyQt4.QtCore import *
from PyQt4.QtGui import *
from PyQt4.QtWebKit import *
app = QApplication(sys.argv)
web = QWebView()
web.load(QUrl("http://www.google.com"))
web.show()
sys.exit(app.exec_())
How do I convert a number to a string in Python?
Answer:
To convert a number to a string in Python, try the str() function.
foo = str( 999 );
print foo + ' is a string';
Result is :
999 is a string
How do I find the current module name in Python?
Answer:
The easiest way is to look at the look at the predefined global variable __main__. If it has the value "__main__", it means the program is run as a script (not as imported module).
E.g.
def main():
print 'Running test...'
if __name__ == '__main__':
main()
