Frequently Asked Questions on PHP & Python

FAQ on PHP & Python

1. What is called suite in PYTHON?
   

   

   
   A suite can be one or more semicolon-separated simple statements on the same line as the header, following the header's colon, or it can be one or more indented statements on subsequent lines. Only the latter form of suite can contain nested compound statemetns.

   
   

   For instance, the statement

         if x<y<z: print x; print y; print z;

   will print the values of x, y and z respectively if their values are in ascending order.

   
   

   The following is an example for a suite that contains nested compound statement:

         if a>b :

              if a>c:

                  print a;

              else:

                   print c;

        else:

              if b>c :

                   print b;

              else:

                   print c;

   This will display the greatest value among three – a, b and c.

   
   
2. List down the various Built-in Data-types in Python.
   
   Python has many built-in (native) data types.  Here are the important ones among them:
   

   1. Booleans
   2. Numbers
   3. Strings
   4. Bytes and byte arrays
   5. Lists
   6. Tuples
   7. Sets and 
   8. Dictionaries

      
3. Give the functionalities of the following Sequence Type Operator?

            i)  seq[ind1:ind2]

         ii)  obj in seq

  

Colon (:) Operator:

      This operator is applied on sequence data types such as List, String or Tuple to extract a list of items from them.  In Python, the colon : allows the square brackets to take as many as two numbers.  For any sequence which only uses numeric indexes, this will return the portion which is between the specified indexes. This is known as 'slicing', and the result of slicing a string is often called a 'substring'.

      The following code written in Python illustrates this:

           'Hello, World!'[3:9]

      will return 'lo, wo'.

           string = 'Hello, World!';

           print string[:5];

      results in the string 'Hello'. And

           print string[-6:-1];

      will return the string 'World'

in Operator:

      The  in operator is used to iterate through all the items in a sequence of items.

4. List down the built in functions in Python.

Python documentation lists 80 built-in functions at: http://docs.python.org/library/functions.html

Some of the most widely used built-in functions in Python are as follows:

• Math functions: abs(x), round(x, n)
• Type conversion functions: bool(x), float(x), int(x), long(x), str(x)
• Input functions: raw_input(x), input(x)
• Miscellaneous: len(x), id(x) 

    5.  How do you create a functions in PYTHON? And write a Python program to print Fibonacci Series.  

          The keyword def introduces a function definition. It must be followed by the function name and the parenthesized list of formal parameters. The statements that form the body of the function start at the next line, indented by a tab stop. 

          The first statement of the function body can optionally be a string literal; this string literal is the function's documentation string, or docstring. There are tools which use docstrings to automatically produce printed documentation, or to let the user interactively browse through code; it's good practice to include docstrings in code that you write, so try to make a habit of it.

          The following is a script written using Python for creating a function that writes the Fibonacci series to an arbitrary boundary:

>>> def fib(n):    # write Fibonacci series up to n
...     "Print a Fibonacci series up to n"
...     a, b = 0, 1
...     while b < n:
...         print b,
...         a, b = b, a+b
... 
>>> # Now call the function we just defined:
... fib(2000)
1 1 2 3 5 8 13 21 34 55 89 144 233 377 610 987 1597

Big Questions:

1. A) How will you PHP to access data from MySQL? (16)

(OR)

B) Write a python program to create and use an account object with two functions. (16)

2. A) Write notes on the following:

         i)  Create and Assign Lists

        ii)  Access Values in Lists

       iii)  Update Lists

     iv)  Remove List Elements and Lists (16)

(OR)

B-1)Define a procedure histogram() that takes a list of integers and prints a histogram to the screen. For example, the input 4, 9, 7 should print the following:

                 ****
                 *********
                 ******* (8)

B-2) Write a simple program in python for finding the greatest ans smallest of n numbers. (8)

3. A) Write a program in Python to simulate a simple calculator (8)

(OR)

B) With a neat sketch say how the dictionaries are compared in PYTHON? (8)