Essential Python Interview Questions: Day 1 Insights

What are local variables and global variables in Python?

• Global Variables: Variables declared outside a function or in a global space are called global variables. These variables can be accessed by any function in the program.

• Local Variables: Any variable declared inside a function is known as a local variable. This variable is present in the local space and not in the global space.

When to use a tuple vs list vs dictionary in Python?

• Use a tuple to store a sequence of items that will not change.

• Use a list to store a sequence of items that may change.

• Use a dictionary when you want to associate pairs of two items.

Explain some benefits of Python

• Python is a dynamic-typed language. It means that you don’t need to mention the data type of variables during their declaration.

• Python supports object-orientated programming as you can define classes along with the composition and inheritance.

• Functions in Python are like first-class objects. It suggests you can assign them to variables, return from other methods and pass them as arguments.

• Developing using Python is quick but running it is often slower than compiled languages.

• Python has several usages like web-based applications, test automation, data modeling, big data analytics, and much more.

What is Lambda Functions in Python?

A Lambda Function is a small anonymous function. A lambda function can take any number of arguments, but can only have one expression.

Consider:

x = lambda a : a + 10
print(x(5)) # Output: 15