https://pythonflood.com/python-namespace-the-psychology-behind-dynamic-programming-f08df8b49792

1. PYTHON
NAMESPACE
PythonNamespace-ThePsychologyBehindDynamicProgramming
www.pythonflood.com

2. www.pythonflood.com
PythonNamespace
Python is a widely-used high-level programming language that has gained popularity for its simplicity
and flexibility. It provides various features that make it easy to write and understand code. One of these
features is the concept of Namespace and Scope.
In Python, every variable, function, and object is defined within a specific namespace and has a specific
scope. Understanding how namespaces and scopes work is crucial for any Python programmer.
WhatisNamespace?
In Python, a Namespace is essentially a container that holds a set of names or identifiers, along with their
corresponding objects. Think of it like a directory that contains files — the Namespace contains the
names and objects, and the directory contains the files.
The main purpose of a Namespace is to provide a unique name to each object in a program so that the
objects can be easily identified and accessed.

3. www.pythonflood.com
TypesofNamespace:
There are two types of Namespaces in Python — Local and Global.
1. Local Namespace:
A Local Namespace is created whenever a function is called, and it contains all the names or identifiers
that are defined within that function.
The Local Namespace is only accessible within the function, and changes made to it are not reflected
outside the function.
2. Global Namespace:
A Global Namespace is created when a module is imported or defined, and it contains all the names or
identifiers that are defined outside of functions.
This means that the Global Namespace is accessible throughout the entire program, and any changes
made to the names or objects in the Global Namespace are reflected everywhere.

4. www.pythonflood.com
Real-LifeExampleusingNamespace:
def grades():
john_grade = 85
mary_grade = 92
bob_grade = 78
print(students[0] + ': ' + str(john_grade))
print(students[1] + ': ' + str(mary_grade))
print(students[2] + ': ' + str(bob_grade))
grades()
Let’s say you’re a teacher, and you want to keep track of your students’ grades. You could create a program that uses
Namespaces to store the students’ names and grades.
The Global Namespace would contain the students’ names, while the Local Namespace would contain the grades for
each student.
Here is an example written by PythonFlood:
students = ['John', 'Mary', 'Bob']
In this example, the Global Namespace contains the list of students, while the Local Namespace contains the grades
for each student. The ‘grades()’ function prints out each student’s name and grade to the console.

5. www.pythonflood.com
BestPracticesforNamespaceandScope
Avoid using global variables whenever possible. Global variables can make your code harder to read and debug
since it can be difficult to keep track of where a variable is being modified.
Use descriptive variable names to make it clear what each variable is used for. This can help prevent naming
conflicts and make your code easier to understand.
Use functions and classes to encapsulate code and avoid namespace pollution. By grouping related code
together in functions and classes, you can minimize the number of variables in the global namespace and make it
easier to reason about your code.
Avoid using wildcard imports (from module import *) since they can introduce naming conflicts and make it
harder to track down bugs.
Here are some best practices for using namespaces and scopes in your Python code:
1.
2.
3.
4.

6. www.pythonflood.com
Conclusion
In conclusion, understanding the concept of Namespace and Scope in Python is essential for any programmer who
wants to write efficient and effective code. Namespaces and Scopes provide a way to organize and access variables
and functions in a Python program.
By understanding the different types of namespaces and scopes, and the rules for resolution, programmers can avoid
naming conflicts and ensure that their code runs smoothly.
Best practices for namespace and scope management, such as avoiding global variables and using descriptive
naming conventions, can also help improve the readability and maintainability of code.
Overall, namespaces and scopes are important concepts to understand for any Python programmer who wants to
write high-quality, well-structured code.