Answer:

In Python, if you want to assign a raw string without any character escape, you can use the following:

s = r'\\foo\\\bar'
print s

Answer:

To return the absolute path when you provide shortcut path such as ".", e.g.

import os
print os.path.abspath(".") # print the full path of ., depending where you execute the program

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!"

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.

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_())

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

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()

Answer:

It is very easy to generate a random number in Python, see below:

import random

print random.randint(1,100)

The above code print a number between 1 to 100.

Answer:

In Python, multi-line string are enclosed in triple double (or single) quotes:

E.g.

s = """Line1
Line2
Line3"""

print s

Or

s = '''Line1
Line2
Line3'''

print s

Both methods are valid.

Answer:

Strings in Python are immutable, if you want to modify a single character in a string in Python, you need to do something like the following...

a = list("foo")
a[2] = 'x'
print ''.join(a)

The string "fox " will be printed out.