What is namespace:
A namespace is a system to have a unique name for each and every object in Python. An object might be a variable or a method. Python itself maintains a namespace in the form of a Python dictionary. Let’s go through an example, a directory-file system structure in computers. Needless to say, that one can have multiple directories having a file with the same name inside of every directory. But one can get directed to the file, one wishes, just by specifying the absolute path to the file.
Real-time example, the role of a namespace is like a surname. One might not find a single “Alice” in the class there might be multiple “Alice” but when you particularly ask for “Alice Lee” or “Alice Clark” (with a surname), there will be only one (time being don’t think of both first name and surname are same for multiple students).
On the similar lines, Python interpreter understands what exact method or variable one is trying to point to in the code, depending upon the namespace. So, the division of the word itself gives little more information. Its Name (which means name, an unique identifier) + Space(which talks something related to scope). Here, a name might be of any Python method or variable and space depends upon the location from where is trying to access a variable or a method.
Types of namespaces :
When Python interpreter runs solely without and user-defined modules, methods, classes, etc. Some functions like print(), id() are always present, these are built in namespaces. When a user creates a module, a global namespace gets created, later creation of local functions creates the local namespace. The built-in namespace encompasses global namespace and global namespace encompasses local namespace.
Lifetime of a namespace :
A lifetime of a namespace depends upon the scope of objects, if the scope of an object ends, the lifetime of that namespace comes to an end. Hence, it is not possible to access inner namespace’s objects from an outer namespace.
As shown in the following figure, same object name can be present in multiple namespaces as isolation between the same name is maintained by their namespace.
But in some cases, one might be interested in updating or processing global variable only, as shown in the following example, one should mark it explicitly as global and the update or process.
Scope of Objects in Python :
Scope refers to the coding region from which particular Python object is accessible. Hence one cannot access any particular object from anywhere from the code, the accessing has to be allowed by the scope of the object.
Lets take an example to have details understanding of the same:
Inside some_func Inside inner function, value of var: 10 Traceback (most recent call last): File "/home/1eb47bb3eac2fa36d6bfe5d349dfcb84.py", line 8, in some_func() File "/home/1eb47bb3eac2fa36d6bfe5d349dfcb84.py", line 7, in some_func print("Try printing var from outer function: ",var) NameError: name 'var' is not defined
- Python Scope of Variables
- Python | Accessing variable value from code scope
- Scope Resolution in Python | LEGB Rule
- Python | Scope resolution when a function is called or defined
- Python - Read blob object in python using wand library
- MySQL-Connector-Python module in Python
- Important differences between Python 2.x and Python 3.x with examples
- Python | PRAW - Python Reddit API Wrapper
- Python | Convert list to Python array
- twitter-text-python (ttp) module - Python
- Python | Index of Non-Zero elements in Python list
- Reading Python File-Like Objects from C | Python
- Python | Merge Python key values to list
- Python | Sort Python Dictionaries by Key or Value
- Python | Add Logging to a Python Script
- Python | Set 4 (Dictionary, Keywords in Python)
- Python | Add Logging to Python Libraries
- Python | Visualizing O(n) using Python
- Any All in Python
If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to firstname.lastname@example.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.
Please Improve this article if you find anything incorrect by clicking on the "Improve Article" button below.
Improved By : wwwchetanranecr7