from import python example

Clark 42 Published: 07/22/2024

from import python example

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Python from import vs import reddit

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When it comes to importing modules in Python, there are two main ways to do so: from and import. While both methods serve the same purpose – accessing a module's functions or variables – they differ in their scope and usage.

Import

The import statement is used to bring an entire module into your current scope. When you import a module, you can access all its variables, functions, classes, and other definitions directly.

Example:

import math
print(math.pi)  # prints 3.14159265359...

In this example, we're importing the math module, which allows us to use its functions and constants like pi.

From

The from keyword is used in conjunction with import to selectively import specific variables, functions, or classes from a module.

Example:

from math import sin, cos
print(sin(3.14))  # prints -0.001593...
print(cos(3.14))   # prints 0.999848...

Here, we're importing only the sin and cos functions from the math module.

Key differences

Scope: When you import a module using import, all its contents are available in your current scope. With from, only the specific items you selected are imported. Namespace: When you use from, you're importing items into your current namespace, which means they can be accessed without prefixing them with the module name (e.g., math.sin becomes just sin). With import, the module's contents are accessible through its name (e.g., math.pi). Re-importing: When you re-import a module using from, it will overwrite any previous imports of the same name. If you re-import a module using import, it won't affect any existing imports.

Reddit discussion

On Reddit, discussions around from vs import often center on best practices and common pitfalls.

For example, in this post, a user asks about the differences between the two methods. One user responds by highlighting the importance of using from when you only need to access specific items from a module, as it can help avoid polluting your namespace with unnecessary imports.

In another post, a user asks about the implications of re-importing modules. One commenter notes that using from for re-importing can lead to unexpected behavior if you're not careful, whereas using import tends to be safer.

In conclusion, both import and from are essential tools in Python programming. Understanding their differences and when to use each can help you write more efficient, readable, and maintainable code.

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