What is the output of following Python code?

 

1. What is the output of following Python code?

a = 'a'

print(int(a, 16))

Solution and Explanation:

 Let's break down the expression int(a, 16):

a = 'a': This line assigns the string 'a' to the variable a.

int(a, 16): The int() function in Python is used to convert a string or number to an integer. In this case, int() takes two arguments: the string 'a', and the base 16 (hexadecimal).

When the base is specified as 16, Python interprets the string 'a' as a hexadecimal number.

In hexadecimal notation, the letter 'a' represents the decimal value 10.

Therefore, int('a', 16) converts the hexadecimal string 'a' to its equivalent decimal integer value, which is 10.

So, when you execute print(int(a, 16)), it converts the hexadecimal string 'a' to its decimal equivalent and prints the result, which is: 10

2. What is the output of following Python code?

x = [1, 2, 3]

y = x[:-1]

print(y)

Solution and Explanation:

let's go through each part of the code:

Creating the list x:

x = [1, 2, 3]

Here, a list named x is created with three elements: 1, 2, and 3.

Slicing x to create a new list y:

y = x[:-1]

This line uses slicing to create a new list y from x. The slicing expression x[:-1] means to select all elements from x starting from the first element (index 0) up to, but not including, the last element (index -1). In Python, negative indices refer to elements from the end of the list. So, x[:-1] selects all elements of x except for the last one.

Printing the list y:

print(y)

This line prints the list y.

After executing this code, the output of print(y) would be [1, 2]. This is because the last element (3) of x is excluded when creating y using slicing.

3. What is the output of following Python code?

x = 10 

print(x + 10e-17)


Solution and Explanation:

Let's break it down step by step:

x = 10: This line assigns the value 10 to the variable x. So, x now holds the value 10.

print(x + 10e-17): In this line, you're printing the result of adding 10e-17 to the value of x. Here, 10e-17 represents 10 multiplied by 10 to the power of -17. This is a way to express very small numbers in scientific notation, where 10e-17 means 10 multiplied by 10 raised to the power of -17, which equals 0.00000000000000001.

So, when you run this code, it will print the result of adding 0.00000000000000001 to 10, which would be a very close approximation to 10, because 0.00000000000000001 is a very tiny number compared to 10. Due to limitations in floating-point arithmetic, you might not see the exact result printed, but it would be very close to 10.