Python from import vs import

Samantha 190 Published: 07/31/2024

Python from import vs import

I'd be happy to explain the difference between from and import statements in Python.

Import

In Python, the import statement is used to load a module or package into memory. When you use import, you're essentially saying, "Hey, I want to use this entire module or package." Here's an example:

import math
print(math.pi)  # prints the value of pi

When you use import math, Python loads the entire math module into memory, and makes all its functions and variables available for use.

From

The from keyword is used in combination with import to import specific objects (like functions or variables) from a module. When you use from, you're saying, "I want to use this specific thing from that module."

Here's an example:

from math import sin
print(sin(3.14))  # prints the sine of 3.14

In this case, Python loads the entire math module into memory, but only imports the sin function specifically. You can then use the sin function without having to qualify it with math..

Key differences

Here are some key differences between import and from:

Importing everything: When you use import, Python loads the entire module or package into memory. With from, you're importing specific objects, which can reduce memory usage. Qualifying names: When you import a module using import, you need to qualify variable or function names with the module name (e.g., math.pi or math.sin). When you use from, you don't need to qualify the names (e.g., just sin(3.14)). Namespace pollution: Using import * (the "wildcard" import) can pollute the namespace by bringing in variables and functions from the imported module that might conflict with your own code. Avoid this by using from to import specific objects.

Best practices

Here are some best practices for using import and from:

Use absolute imports: Instead of importing modules relative to the current working directory, use absolute imports (e.g., import math instead of from .math import sin). Import only what you need: Use from to import specific objects rather than entire modules. Avoid wildcard imports: Don't use import * unless you have a good reason to do so. Instead, use from or import with explicit names.

I hope this helps clarify the difference between import and from in Python!

python from . import not working

I'm here to help! It seems like you're having some trouble with the from and import statements in Python. This can be frustrating, especially if you're new to programming or trying to work on a project.

First of all, let's clarify what these statements do. The import statement is used to bring external modules into your Python code so that you can use their functions, classes, and variables. For example, if you want to use the math module for mathematical operations, you would use the following line: import math. This allows you to access the math module's contents.

On the other hand, the from keyword is used with the import statement to specify a specific part of an external module that you want to import. For example, if you only need the sin function from the math module, you can use: from math import sin. This allows you to access just the sin function from the math module.

Now, back to your problem! If you're having trouble with these statements, there are a few things you can try:

Check for spelling mistakes: Make sure that your statement is typed correctly, including capitalization and punctuation. A small mistake can prevent the import from working properly. Verify module installation: If you're trying to import a third-party library or module, make sure it's installed correctly on your system. You can usually install modules using pip (Python Package Installer) or another package manager specific to your operating system. Check for namespace conflicts: If you have multiple modules with similar names, this could cause issues when importing them. Try renaming one of the modules to avoid the conflict. Try using absolute imports: If you're having trouble with relative imports (e.g., from . import something), try using absolute imports instead (e.g., import something). This can help resolve naming conflicts or other issues. Check your Python version and compatibility: Ensure that the module is compatible with your Python version. You can check this by looking at the module's documentation or installation instructions. Try re-installing Python or the module: Sometimes, reinstalling Python or the module can resolve any issues that may be causing problems. Consult documentation and tutorials: Read through the official documentation for the module you're trying to import (or your programming language as a whole). Tutorials and guides can also provide valuable insight into how things work and what might go wrong.

If none of these suggestions help, please feel free to share more details about your specific situation, including any error messages you may be receiving. I'll do my best to provide guidance or point you in the direction of a solution!