Top 10+ Python Interview Questions and Answers
Prepare with Top 10+ Python Interview Questions and Answers: Key insights and expert tips to ace your Python interviews and boost your coding career.
1. What is the difference between a function and a method in Python?
Functions and methods are the same in use and the same in syntax but still there are some differences between functions and methods.
2. What is the difference between sequences like list, tuple, set, and dictionary?
3. Explain Generators in Python.
Generators are a special type of function that allows you to generate an iterable sequence of values. The generator generates a value on the fly(instantly) rather than having to generate and store the entire sequence in memory. Instead of using the return keyword to return data we need to use the yield keyword in the generator function
Example:
list=[0,12,3,3,4,4]
def display(): #normal function
print(“hello”)
return list
#creating generator function
def functionGenerator():
for i in range(10): #0-9
yield i #here, yield works like a return statement means
data= functionGenerator() #here,data is an iterable which consists 0 to 9 values
print(next(data)) #0
print(next(data)) #1
print(next(data)) #2
print(next(data)) #3
print(next(data)) #4
print(next(data)) #5
print(next(data)) #6
print(next(data)) #7
print(next(data)) #8
print(next(data)) #9
In the above example, functionGenerator() is a generator function that generates a sequence from 0 to 10 numbers and print(next(data)) prints one by one value from 0 to 9
Q. 4. What is the difference between return and yield?
The return statement is used in a normal function to return data whereas the yield statement is used in the generator function to return data.
The return statement terminates the execution of the function when it encounters. Whereas the yield statement does not terminate the execution of a function it only pauses or halts the execution of the function.
Another difference is return statements are never executed, which means when return statements occur, function execution will stop at that point. Whereas yield statements do not stop the execution resume the execution of the function when the yield statement encounters
Q.5. What is the difference between class methods and instance methods?
- Instance method called by object name and dot operator
- A class method called by CLASS name and dot operator
- The instance method works on instance variables
- The class method works on class variables
- The instance method takes the variable as an argument
- The class method takes the cls variable as an argument
- There is no need to use any decorator at the start of an instance method
- The class method should always be decorated by using @Classmethod decorator
Q.6 Explain the pass statement in Python.
Empty code is not allowed in loops, function definitions, class definitions, or if statements. but still, we are writing empty blocks in code then it will generate an error..so to avoid that error we can use pass statements into those empty blocks
Q.7 Explain the break statement in Python.
Breal is used to break the loop when the given condition is satisfied or before it is going to complete all the iterations.
Q.8 Explain the continue statement in Python.
Continue statement is used to skip the current iteration of the loop by moving program execution control at the start of the loop
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Q.9 Explain the assert statement in Python.
Assert statements are used for debugging purposes in Python. It returns a boolean expression based on the statement we have passed to it. If it returns true then it does nothing and it continues the execution of code. But if it returns false then it stops the execution of the code by generating an error.
Q.10 Explain local and global variables in Python.
Local variables are variables declared inside any block or function and cannot be accessible outside of that block and function
Global variables are variables declared outside any function or block is called global variables and global variables can be accessible throughout the program.
Q.11 Explain lambda expressions in python?
A lambda function is a function that does not need to be given any name hence the lambda function is also called an “anonymous(nameless) function”. The purpose of introducing lambda functions in Python programming is to make Python code short and concise. In lambdas, the part before :(colon) is called a function declaration, and the part after the colon is called a function definition/body
Q.12 What is iterable and iterators in Python?
Iterable is nothing but the sequence on which we can perform an iteration. Whereas an iterator is an object that is used to iterate upon collection or sequence.
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