DATA, EXPRESSIONS, STATEMENTS
1. What is meant by interpreter?
An
interpreter is a computer program that executes instructions written in a
programming language. It can either execute the source code directly or
translate the source code in a first step into a more efficient representation
and executes this code.
2. How will you invoke the python interpreter?
The
Python interpreter can be invoked by typing the command "python"
without any parameter followed by the "return" key at the shell
prompt.
3. What is meant by interactive mode of the
interpreter?
Interactive
mode is a command line shell which gives immediate feedback for each statement,
while running previously fed statements in active memory. As new lines are fed
into the interpreter, the fed program is evaluated both in part and in whole.
4. Write a snippet to display “Hello World” in
python interpreter.
In script
mode:
>>>
print "Hello World"
Hello
World
In
Interactive Mode:
>>>>"Hello
World"
'HelloWorld'
5. What is a value? What are the
different types of values?
A value is one of the fundamental things – like a letter or a
number – that a program manipulates. Its types are: integer, float, boolean,
strings and lists.
6. Define a variable and write down the rules for
naming a variable.
A name
that refers to a value is a variable. Variable names can be arbitrarily long.
They can contain both letters and numbers, but they have to begin with a
letter. It is legal to use uppercase letters, but it is good to begin variable
names with a lowercase letter.
7. Define keyword and enumerate some of the
keywords in Python.
A keyword
is a reserved word that is used by the compiler to parse a program. Keywords
cannot be used as variable names. Some of the keywords used in python are: and,
del, from, not, while, is, continue.
8. Define statement and what are its types?
A
statement is an instruction that the Python interpreter can execute. There are
two types of statements: print and assignment statement.
9. What do you meant by an assignment statement?
An
assignment statement creates new variables and gives them values:
Eg 1:
Message = 'And now for something completely different'
Eg 2: n =
17
10. What is tuple?
A tuple
is a sequence of immutable Python objects. Tuples are sequences, like lists.
The differences between tuples and lists are, the tuples cannot be changed
unlike lists and tuples use parentheses, whereas lists use square brackets.
Creating a tuple is as simple as putting different comma-separated values.
Comma-separated values between parentheses can also be used.
Example:
tup1 = ('physics', 'chemistry', 1997, 2000);
11.What is an expression?
An
expression is a combination of values, variables, and operators. An expression
is evaluated using assignment operator.
Examples:
Y=x + 17
12. What do you mean by an operand and an operator? Illustrate your answer
with relevant example.
An
operator is a symbol that specifies an operation to be performed on the
operands. The data items that an operator acts upon are called operands. The
operators +, -, *, / and ** perform addition, subtraction, multiplication,
division and exponentiation. Example: 20+32
In this
example, 20 and 32 are operands and + is an operator.
13. What is the order in which operations are
evaluated? Give the order of precedence.
The set
of rules that govern the order in which expressions involving multiple
operators and operands are evaluated is known as rule of precedence.
Parentheses have the highest precedence followed by exponentiation.
Multiplication and division have the next highest precedence followed by
addition and subtraction.
14. Illustrate the use of * and + operators in
string with example.
The *
operator performs repetition on strings and the + operator performs
concatenation on strings.
Example:
>>>
‘Hello*3’
Output: HelloHelloHello
>>>’Hello+World’
Output:
HelloWorld
15. What is the symbol for comment? Give an
example.
# is the
symbol for comments in Python.
Example:
# compute
the percentage of the hour that has elapsed
16. What is function call?
A function is a named sequence of statements that performs a
computation. When we define a function, we specify the name and the sequence of
statements. Later, we can “call” the function by its name called as function
call.
17. Identify the parts of a function in the given
example.
>>> betty =
type("32")
>>> print
betty
The name
of the function is type, and it
displays the type of a value or variable. The value or variable, which is
called the argument of the function, is enclosed in parentheses. The argument
is 32. The function returns the
result called return value. The return value is stored in betty.
18. What is a local variable?
A
variable defined inside a function. A local variable can only be used inside
its function.
19. What is the output of the following?
a.
float(32)
b.
float("3.14159")
Output:
a. 32.0 The
float function converts integers to floating-point numbers.
b.
3.14159 The float function converts
strings to floating-point numbers.
20. What do you mean by flow of execution?
In order
to ensure that a function is defined before its first use, we have to know the
order in which statements are executed, which is called the flow of execution.
Execution always begins at the first statement of the program. Statements are
executed one at a time, in order from top to bottom.
21. Write down the output for the following
program.
first =
'throat'
second =
'warbler'
print
first + second
Output:
throatwarbler
22. Give the syntax of function definition.
def NAME(
LIST OF PARAMETERS ):
STATEMENTS
23. Explain the concept of floor division.
The
operation that divides two numbers and chops off the fraction part is known as
floor division.
24. What is type coercion? Give example.
Automatic
method to convert between data types is called type coercion. For mathematical
operators, if any one operand is a float, the other is automatically converted
to float.
Eg:
>>> minute =
59
>>> minute /
60.0
0.983333333333
25. Write a math function to perform √2 / 2.
>>> math.sqrt(2)
/ 2.0
0.707106781187
26. What is meant by traceback?
A list of
the functions that tells us what program file the error occurred in, and what
line, and what functions were executing at the time. It also shows the line of
code that caused the error.
Part A:
1.
What is
interpreter?
2.
What are the two
modes of python?
3.
List the
features of python.
4.
List the
applications of python
5.
List the
difference between interactive and script mode
6.
What is value in
python?
7.
What is
identifier? and list the rules to name identifier.
8.
What is keyword?
9.
How to get data
types in compile time and runtime?
10.
What is indexing
and types of indexing?
11.
List out the
operations on strings.
12.
Explain slicing?
13.
Explain below
operations with the example (i)Concatenation (ii)Repetition
14.
Give the
difference between list and tuple
15.
Differentiate
Membership and Identity operators.
16.
Compose the
importance of indentation in python.
17.
Evaluate the
expression and find the result
(a+b)*c/d
a+b*c/d
18.
Write a python
program to print ‘n’ numbers.
19.
Define function
and its uses
20.
Give the various
data types in Python
21.
Assess a program
to assign and access variables.
22.
Select and
assign how an input operation was done in python.
23.
Discover the
difference between logical and bitwise operator.
24.
Give the
reserved words in Python.
25.
Give the
operator precedence in python.
26.
Define the scope
and lifetime of a variable in python.
27.
Point out the
uses of default arguments in python
28.
Generalize the
uses of python module.
29.
Demonstrate how
a function calls another function. Justify your answer.
30.
List the syntax
for function call with and without arguments.
31.
Define recursive
function.
32.
What are the two
parts of function definition? give the syntax.
33. Point out the difference between recursive and iterative technique.
34.
Give the syntax
for variable length arguments.
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