Introduction

Question 1

Two main reason to choose Python?

Answer 1

1. Code Readability

2. Developer Productivity

Question 2

What type of programming language Python is?

Answer 2

1. General programming language
2. Scripting programming language
3. Functional programming language
4. Object Oriented programming language

Question 3

What’s the execution flow of python code?

Answer 3

1. Source code (.py)
2. __pycache__
3. Python Virtual Machine (PVM)

Question 4

What are different implementation of Python?

Answer 4

1. cpython
2. jython
3. iron python
4. pypy
5. stackless

Question 5

What are frozen binaries in Python?

Answer 5

Python byte codes with Python interpreter, hence no environment setup is required for same.

Question 6

How to decompose a python program?

Answer 6

Modules

• • statements
    
    • • expressions
        
        • – objects

Question 7

Is Python strongly typed? If yes, how?

Answer 7

yes, it provides datatype to each of it’s variables. There is not variable without datatype.

Question 8

Is Python Dynamically typed language? If yes, how?

Answer 8

yes it is dynamically typed.

In this interpreter provides “type” to a variable during runtime, based on the variable’s value at that time.

Question 9

What’s the relation between objects and expressions?

Answer 9

Expressions are used to created Objects

Question 10

How variables created in Python?

Answer 10

When we assign a value to it

Question 11

How to add multiple expressions in a single line in Python interactive?

Answer 11

By using “comma”.

Question 12

How to add single line comment in Python scripts?

Answer 12

By using #

Question 13

Given an example of chained comparision?

Answer 13

a < b < c

Question 14

What’s the result for following expression:

a. 9/3
b. 9.0/3
c. 5//-2
d. 5//-2.0

Answer 14

a. 9/3 = 3
b. 9.0/3 = 3.0
c. 5//-2 = -3
d. 5//-2.0 = -3

Question 15

How to represent data in :

1. HexaDecimal
2. Octal
3. Binary

Answer 15

1. HexaDecimal: 0x234
2. Octal: 0o234
3. Binary: 0b11001

Question 16

Name function to convert an integer into

1. Hexadecimal
2. Octal
3. Binary

Answer 16

hex()
oct()
bin()

Question 17

how to convert base value to int?

Answer 17

int(baseValue, base)
e.g. int(0x345, 16)
int(0o76, 8)
int(0b11011, 2)

Question 18

Built-in function for calculation of power of decimal number?

Answer 18

pow()

pow(2,6)

Question 19

Built-int function for calculation of

1. Power
2. maximum
3. minimum
4. integer
5. rounding upto decimal place
6. summation
7. absolute value

Answer 19

1. Power = pow(2,6)
2. maximum = max()
3. minimum = min()
4. integer = int()
5. rounding upto decimal place = round(23.445,2)
6. summation = sum([])
7. absolute value = abs()

Question 20

Math module common function:

1. Get pi Value
2. Get e value
3. Calculate square root
4. Calculate floor value
5. Calculate truncate value
6. Calculate, sin, cos, tan

Answer 20

1. Get pi Value = math.pi
2. Get e value = math.e
3. Calculate square root = math.sqrt()
4. Calculate floor value = math.floor()
5. Calculate truncate value = math.trunc()
6. Calculate, sin, cos, tan = math.sin(), math.cos(), math.tan()

Question 21

Random module common function:

1. Get a random float value
2. Get a random int value
3. Shuffle a list
4. Get a choice from the list

Answer 21

Random module common function:

1. Get a random float value: random.random()
2. Get a random int value: random.randint(1,1000)
3. Shuffle a list: random.shuffle([])
4. Get a choice from the list: random.choice([])

Question 22

What are sets ?

Answer 22

Sets are nothing but the “value less dictionaries”. (means they have only keys”, with following properties:

1. Unordered
2. Unique
3. iterable

Question 23

Can we add lists and dictionaries in sets?

Answer 23

No, because both of Mutable.

Only those objects can be stored in set, which are immutable and hasable.

Question 24

How to create set in Python

Answer 24

1. By function name = set()

2. By Curly braces = {a,b,c,d}

Question 25

Provide following set operations by expressions and functions: 1. Union 2. Intersection

Answer 25

1. Union >> a.union(b) >> a | b | 2. Intersection >> a.intersection(b) >> a & b

Question 26

How to add an item inside a set?

Answer 26

a = set() | a.add(234)

Question 27

How to remove an item from a set

Answer 27

a = set() | a.remove(34)

Question 28

How to find one set is subset of another?

Answer 28

a = set() b = set() a.issubset(b)

Question 29

Does variable contains the absolute or literal value in Python?

Answer 29

No, variables are just references in Python.

Question 30

Is there any primitive type in Python?

Answer 30

No, there is no primitive type in Python. Each and every literal are objects, even numbers.

Question 31

Is type associated by variables in Python?

Answer 31

No, datatypes are not associated with variables. These are just references. Types are always associated with objects.

Question 32

Different steps executed by Python, when we run a = 34?

Answer 32

1. It creates a variable and save same in one location 2. It creates object '34' and save same in another location 3. It creates a reference, (pointer in memory) and link variable and object

Question 33

Is it possible to link or refer one variable by another variable?

Answer 33

No, a variable can only refer an object

Question 34

it is possible to assign a type to a variable?

Answer 34

No, types are always assigned to the objects.

Question 35

How references are implemented in Python?

Answer 35

References are implemented as "pointers" in Python.

Question 36

What are header fields in each objects? What are the main components of header fields?

Answer 36

Header fields contains the "meta-data" about the object. Each header contains following fields: 1. Type Designator field 2. Reference Counter field

Question 37

What are shared references?

Answer 37

References which refers same objects: a = 5 b = a

Question 38

What are shared references of mutable objects

Answer 38

``` a = [1,2,3] b = a b[0] = 23 # This will affect a as well ```

Question 39

What is "copy" module and it's important function?

Answer 39

``` Copy module is used to copy any type of collection. import copy a = [1,2,3] b = copy.copy(a) c = copy.deepcopy(a) ```

Question 40

Which operator is used to compare the "values" of object?

Answer 40

Equality operator: ==

Question 41

Which operator is used to compare the "references" of the object?

Answer 41

"is operator" | a is b

Question 42

How to get the number of references hold by an object?

Answer 42

By using "sys" module | sys.getrefcount(1)

Question 43

What is a string

Answer 43

Ordered collection of characters

Question 44

How to find the length of the string?

Answer 44

len()

Question 45

Does escape sequence works in all types of string representation in Python?

Answer 45

yes, it works with 1. single quote 2. double quote 3. tripple quote

Question 46

What is a raw string? What's it's use case

Answer 46

Raw string is used to disable the "escape" sequence mechanism in different strings. e.g. r'my\path' It is generally used in path

Question 47

What will happen if we add "back slash" at the end of "raw string"?

Answer 47

it will give an error, as we are not allowed to use "odd" number of back slashes in raw string

Question 48

What are strings in triple quotes? What is it's use case?

Answer 48

Triple quote strings are used to create multiline string. | It's use case is to preserve the formatting.

Question 49

Can we use "multiple string" to disable the source code?

Answer 49

Yes, this is generally done by the developers

Question 50

Overloaded operators used for string addition and multiplications?

Answer 50

1. String addition: + | 2. String multiplication: *

Question 51

What is the use case of string multiplication?

Answer 51

To repeat the character when required '_'*80 '---------------------------'

Question 52

How to iterate through character of a string?

Answer 52

s = 'asdfoasdf' for c in s print(c)

Question 53

What's the purpose of in operator?

Answer 53

It is used to search a substring in a string | 'a' in 'asdflajsdf'