Python subjective question for competitive exam (5)

Q1.How will you concatenate multiple strings together in Python?

We can use following ways to concatenate multiple string together in
Python:
I. use + operator:
E.g.
>>> fname="John"
>>> lname="Ray"
>>> print fname+lname
JohnRay
II. use join function:
E.g.
>>> ''.join(['John','Ray'])
'JohnRay'

Q2. What is the use of Slicing in Python?

We can use Slicing in Python to get a substring from a String.
The syntax of Slicing is very convenient to use.
E.g. In following example we are getting a substring out of the name John.
>>> name="John"
>>> name[1:3]
'oh'
In Slicing we can give two indices in the String to create a Substring. If we
do not give first index, then it defaults to 0.
E.g.
>>> name="John"
>>> name[:2]
'Jo'
If we do not give second index, then it defaults to the size of the String.
>>> name="John"
>>> name[3:]
'n'

Q3. What is lambda expression in Python?

A lambda expression in Python is used for creating an anonymous function.
Wherever we need a function, we can also use a lambda expression.
We have to use lambda keyword for creating a lambda expression. Syntax
of lambda function is as follows:
lambda argumentList: expression
E.g. lambda a,b: a+b
The above mentioned lambda expression takes two arguments and returns
their sum.
We can use lambda expression to return a function.
A lambda expression can be used to pass a function as an argument in
another function.

Q4.What are the main benefits of using Python?

Some of the main benefits of using Python are as follows:
I. Easy to learn: Python is simple language. It is easy to learn for a
new programmer.
II. Large library: There is a large library for utilities in Python that
can be used for different kinds of applications.
III. Readability: Python has a variety of statements and expressions
that are quite readable and very explicit in their use. It increases
the readability of overall code.
IV. Memory management: In Python, memory management is built
into the Interpreter. So a developer does not have to spend effort on
managing memory among objects.
V. Complex built-in Data types: Python has built-in Complex data
types like list, set, dict etc. These data types give very good
performance as well as save time in coding new features

Q5What is the use of // operator in Python?

Python provides // operator to perform floor division of a number by
another. The result of // operator is a whole number (without decimal part)
quotient that we get by dividing left number with right number.
It can also be used floordiv(a,b).
E.g.
10// 4 = 2
-10//4 = -3