Don’t Create New Plot Every Time Through Loop Python

Python Programming

As a Python developer, I’ve learned the importance of efficiently managing resources, especially when it comes to plotting data within a loop. One common mistake I used to make was creating a new plot every time through a loop, which not only consumed additional memory but also resulted in slower processing. In this article, I’ll delve into the reasons why creating a new plot in each iteration of a loop is inefficient, and I’ll provide alternative approaches to achieve the desired outcome.

The Problem with Creating New Plots in Every Loop Iteration

When we create a new plot within a loop in Python, we are essentially allocating memory for each plot, leading to a significant increase in memory consumption. This can become especially problematic when dealing with large datasets or running our code on systems with limited memory resources. Additionally, the process of initializing a new plot and rendering it takes time, which can result in slower code execution.

Consider a scenario where we are visualizing data within a loop that iterates a few hundred or even thousand times. If we create a new plot in each iteration, we are essentially generating and rendering a new plot every single time, causing unnecessary resource usage and performance overhead.

Efficient Approach: Reusing the Same Plot

Instead of creating a new plot in each iteration of the loop, a more efficient approach is to create the plot outside the loop and then update its content within the loop. This way, we only initialize the plot once, and in each iteration, we update the data or properties of the existing plot without the need to recreate it from scratch.

In Python, this can be achieved using libraries such as Matplotlib. We can initialize the plot and axes before the loop, and then within the loop, we update the data or styling of the plot without recreating it. This not only conserves memory but also contributes to faster execution of our code.


import matplotlib.pyplot as plt

# Initialize the plot and axes outside the loop
fig, ax = plt.subplots()

# Inside the loop, update the plot
for i in range(10):
# Update the plot with new data
ax.plot([i], [i], 'ro') # Example of updating the plot
# Optionally add delays or user interactions to visualize the changes
plt.pause(0.1) # Add a slight delay for visualization


By avoiding the creation of new plots in every iteration of a loop, we can significantly improve the efficiency of our code and conserve system resources. Reusing the same plot within the loop not only reduces memory overhead but also contributes to smoother and faster execution. As developers, it’s essential to be mindful of resource utilization and optimize our code for performance whenever possible.