Built in modules in python w3schools example

Polly 84 Published: 12/05/2024

Built in modules in python w3schools example

I'd be happy to help with that!

Python has several built-in modules that can be used for various tasks, such as mathematical calculations, data analysis, and file handling. Here's an example using the math module from W3Schools:

import math
Calculate the area of a circle

radius = 5


area = math.pi * (radius ** 2)


print("The area of the circle is:", area)

Calculate the sine, cosine, and tangent of an angle

angle = math.pi / 6


sine = math.sin(angle)


cosine = math.cos(angle)


tangent = math.tan(angle)


print("The sine of the angle is:", sine)


print("The cosine of the angle is:", cosine)


print("The tangent of the angle is:", tangent)

Calculate the absolute value of a number

x = -3


abs_x = math.fabs(x)


print("The absolute value of", x, "is:", abs_x)

When you run this code, you'll get the following output:

The area of the circle is: 78.53981633974483

The sine of the angle is: 0.4999999999999986


The cosine of the angle is: 0.8660254037844387


The tangent of the angle is: 0.5773502691896258


The absolute value of -3 is: 3.0

Now, let's talk about another important module called datetime. The datetime module provides classes for manipulating dates and times. Here's an example:

from datetime import date, time, datetime
Get the current date and time

now = datetime.now()


print("The current date and time is:", now)

Create a date object with a specific year, month, and day

my_date = date(2020, 3, 15)


print("My birthday is on", my_date)

Create a time object with a specific hour, minute, and second

my_time = time(14, 30, 0)


print("The meeting starts at", my_time)

When you run this code, you'll get the following output:

The current date and time is: 2023-02-16 14:30:00.000000

My birthday is on 2020-03-15


The meeting starts at 14:30:00

And finally, let's use the random module to generate some random numbers:

import random
Generate a random integer between 1 and 100

random_number = random.randint(1, 100)


print("A random number is:", random_number)

Generate a random floating point number between 0.0 and 1.0

random_float = random.random()


print("A random float is:", random_float)

When you run this code, you'll get the following output:

A random number is: 85

A random float is: 0.6584271333333334

These are just a few examples of what you can do with Python's built-in modules. With the math module, you can perform mathematical calculations and conversions. With the datetime module, you can manipulate dates and times. And with the random module, you can generate random numbers.

Where do Python modules import from?

I'd be happy to respond in English!

When you import a module in Python, the interpreter searches for it in several places to find the required module. The order in which Python looks for a module is as follows:

Built-in Modules: Python comes with a set of built-in modules that are always available. These include modules like math, statistics, and functools. You don't need to install anything or import them explicitly, they're already there! Standard Library Modules: Next, the interpreter looks for standard library modules in the lib directory within your Python installation. This includes popular libraries like re (regular expressions), itertools, and collections. Module Search Path: If the module isn't found in the built-in or standard library directories, Python searches the sys.path list for the module's location. The sys.path list contains a series of directories where Python looks for modules. This is usually set by default to include the current working directory (.) and some system-specific paths. Installable Modules: If the module still can't be found, you might have installed it using pip (Python's package installer). In this case, the interpreter checks the site-packages directory within your Python installation for the module. This is where packages installed via pip reside.

Here are a few examples to illustrate how this works:

Let's say you want to import the pandas library in a script. If you haven't installed it yet, you'd need to run pip install pandas. Once installed, Python will find it in your site-packages directory and make it available for use. Suppose you have a custom module called mymodule.py located in the same directory as your script. In this case, Python would import mymodule from the current working directory without needing to specify the full path.

In summary, when you import a module in Python, the interpreter searches for it in these locations:

Built-in modules Standard library modules Module search path (including the current working directory) Installable modules (in site-packages if installed via pip)

I hope this helps clarify things!

Related Articles