What's the difference between "import os" and "from os import *" and which should I adopt?
In Python, both import os and from os import * are used to import the os module, but they have different implications and usage patterns.
import os: This statement imports the entire os module, making it available in your code using the os prefix. For example, you can access the os.listdir() function as os.listdir() or the os.path module as os.path. This approach promotes better code readability and avoids potential conflicts between functions or variables with the same name in different modules.
from os import *: This statement imports all the names defined in the os module directly into your code's namespace. It allows you to use the imported names without the os prefix. For example, you can directly use listdir() instead of os.listdir() or path instead of os.path. While it may seem convenient, this approach is generally discouraged because it can lead to name clashes and make it unclear where certain functions or variables come from, especially when multiple modules are imported.
The recommended approach is to use import os and explicitly reference the names from the os module. This provides better code clarity, avoids namespace pollution, and makes it easier to identify the origin of the imported functions or variables.
Now what is code's namespace
actually what i know already just English now ☺
In Python, a namespace is a container that holds names (variables, functions, classes, etc.) and provides a way to distinguish between them based on their scope or context. Each namespace is like a dictionary that maps names to their corresponding objects.
A code's namespace refers to the collection of names defined within a specific scope or context, such as a module, function, or class. The namespace determines the visibility and accessibility of names within that scope.
For example, consider the following code snippet:
x = 10
def foo():
y = 20
print(x + y)
foo()
In this code, there are two namespaces:
Global namespace: It contains the name x, which is assigned the value 10. The global namespace is accessible throughout the module.
Local namespace (inside foo() function): It contains the name y, which is assigned the value 20. The local namespace is only accessible within the foo() function.
When the foo() function is called, it accesses both the x variable from the global namespace and the y variable from its local namespace to perform the addition.
Namespaces help in organizing and isolating names, preventing conflicts between names defined in different scopes. They allow you to reuse common names without collisions and make code more modular and maintainable.