Python is known to be the most challenging computer programming skill in 2020. In the interviews of Python, it is seen that every individual gets questioned in different forms, though the questions are the same. A discussion of Python Interview Questions has been done below to guide the programmers through the problems. There are three different levels of Python interview questions as per the experience of the programmer.
So, let’s start without wasting time.
Table of Contents
For the freshers, there are some basic questions which are frequently asked by the interviewer:-
Python is an object-oriented programming language that contains automatic memory management, threads, and exceptions.
Python is known to be a programming language, but scripting works can also be done with Python.
The significant difference between is, lists are mutable, and the tuples are immutable. The syntax of tuples contains the first brackets – (), and the syntax of lists includes the third brackets – [].
Example:
list_data = [ ‘This’, ’is’, ‘an’, ‘example’ , ‘of’, ‘List’ ]
tuple_data = ( ‘This’, ‘is’, ‘an’, ‘example’, ‘of’, ‘tuple’ )
Yes, Python is a case sensitive programming language. If the syntaxes are not being used with the proper cases, then it’s okay but, if not, then it will not recognize the command. Example:
Myname
NameError: name ‘Myname’ is not defined
A negative index is used to index starting from the last element of the tuple, list, or any supportive index classes.
Example:
https://qphs.fs.quoracdn.net/main-qimg-a380b1bc159589df5e0b9842e5b56b6d
https://www.quora.com/What-is-negative-index-in-Python
https://www.quora.com/What-is-negative-index-in-Python
As per the official documentation of Python, an identifier could be of any length. The PEP 8 says that all lines should be limited to a maximum of 79 characters but, the PEP 20 says, ‘readability counts’. Thus, a long identifier will violate PEP-8 and PEP-20.
The pass statement is usually required in Python when there are no requirements of codes but a comment is still needed to make the system syntactically correct. This also works like a null statement in which it does not do anything but keeps code accurate in syntax.
Example:
Input:
https://beginnersbook.com/2018/01/python-pass-statement/
Output:
https://beginnersbook.com/2018/01/python-pass-statement/
Unlike C++, we don’t have ?: in Python, but we have this:
[on true] if [expression] else [on false]
If the expression is True, the statement under [on true] is executed. Else, that under [on false] is executed.
Example:
Input:
https://data-flair.training/blogs/top-python-interview-questions-answer/
Output:
https://data-flair.training/blogs/top-python-interview-questions-answer/
With join(), we can join characters from other string with specified characters.
split() lets splitting a string with the specified character.
In an If-Else statement block, the ‘else’ part is executed when the ‘if’ part is false, and in a try-except block, the else statement gets executed only when no exception is raised in the try statement.
PYTHONPATH variable is typically used to locate the module files that are imported in the program. It must include the Python source library directory and Python source code directory.
Yes, it is possible with the following code:
Output:
S = a + ‘[‘ + b + ‘:’ + c + ‘]’
This statement is an interconnected string. If the a, b, c are strings themselves, then the statement is fine but, if they are not strings, then this statement would be considered as a type error.
The chr(x) built-in function is needed to convert an integer to a Unicode character.
The request for n raises a NameError. Since the ‘n’ is a variable local to the function and it can not be accessed from elsewhere. Python only evaluates default parameter value once; every invocation shares the default value. This means, if one invocation is modifying this, the other one will get the same.
It surely does. Here are the troubles that recursion causes:
There are three ways to remove the whitespaces :
enumerate () iterates through a sequence and extracts the index position, and it’s corresponding value too.
For example:
The output will be:
0 Python
1 C++
2 Scala
*
**
***
****
*****
This pattern can be created using two for loops.
For example:
Palindromes are a sequence of phrases or words that spells the same from both the forward and backward. To implement it to Python, the following codes are needed:
Suppose there is a tuple number = (1,2,3). The values can be unpacked to variables a,b,c. For example:
Step 1:
Step 2:
Step 3:
When the cache gets expired, and a client hits a website with multiple requests, the aftereffect is named as Dogpile effect. To avoid the process, we can use semaphore locks. Then, even if the value expires, the first request will get locked, and it will start generating the new amounts.
The iterator protocol for Python declares that two functions must be used to build an iterator- iter() and next().
For example:
2
4
6
8
10
There are multiple choices to make Python read a random line. The best way to make it do so is by borrowing the choice() method from the random module for this.
For example:-
The re module is what we have for processing regular expressions with Python. Let’s talk about the three methods we mentioned-
Closure in Python occurs when a nested function program references a value in its enclosing scope. That means, it remembers the value.
For example:
First, let’s discuss what sets are. In Python, the game is a collection of items or values which can not be duplicated in the same area.
For example:
{1,2,3}
This means that it can not be indexed
Traceback (most recent call list):
File“<pyshell#197>” line 1, in <module>
Myset[o]
TypeError: ‘set’ object does not support indexing
So, a set is mutable, and a frozen set is immutable, which means the value can not be changed. This can also be used as a key for a dictionary as it is eligible to do so.
frozenset({1,2,3})
There also are some general questions which the interviewer frequently asks:-
With Function input() and raw_input().
When the sequence of statements is being executed, it requires a name. Let’s define a function to take two numbers and return the more significant number.
It returns an iterator of tuples.
When a function calls itself, it is termed as recursion.
It is a way to declare a list in one line.
i=0
While s[i]!=’t’
Print (s[i], end-’’)
i+=1
For I in range (6)
print(s)
Control flow statements let us disturb the normal execution flow of a program and blend it to our will.
Binary, octal, and hexadecimal
A,b =2,3
a,b=b,a
a,b
a,b,c=3,4,5 #This assigns 3, 4, and 5 to a, b, and c respectively
Traceback (most recent call last):
File “<pyshell#332>”, line 1, in <module>
counterfunc(7)
File “<pyshell#331>”, line 2, in counterfunc
while(n==7):print(n)
KeyboardInterrupt
Mutable and immutable.
By using join() method.
Symbols that are needed to correct the syntax are known to be operators.
There are three logical operators – false and true, 7>7 or right and not 2==2
The operator ‘is’ and ‘is not’ tell us if two values have the same identity
Like, 10 is ‘10’
True is not false
The operators that value upon bit by bits.
The various Data Types supported in Python are:
Docstrings or Python documentation strings are used to document a particular and specific segment of code. It is a multi-line string associated with documentation of modules, functions, methods and classes.
In the Programming language of Python, Slicing enables the users to access parts of a sequence. These may be strings, tuples, lists or third party objects.
In this article, you find different suggestions of the frequently asked python interview questions which can help from the freshers to the experts. Read the answers thoroughly and understand them properly. Hope you find the above pieces of information helpful.
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