Get in touch

Awesome Image Awesome Image

Python Development August 11, 2023

Top 7 Common Python Programming Mistakes and How to Fix Them – Comprehensive Guide

Writen by Mahipalsinh Rana


Python Programing Mistakes

We all have heard about Python’s popularity, it is a widely used programming language known for being easy to understand and read It’s loved by both amateur and experienced software engineers. However, even people who are great at coding in Python can some of the time commit normal mistakes.

These mistakes can make their code more slow, harder to work with, and less dependable. In this blog, we will discuss seven normal missteps that Python developers could make. We’ll make sense of each error obviously and give answers to fix them. Whether you’re new to coding or have been doing it for some time, this guide will assist you with understanding these slip-ups better. You’ll figure out how to make your Python code more grounded, more reliable, and feel more confident when coding.

About Python

Python is a kind of code that numerous developers truly like. It’s extraordinary on the grounds that it’s not difficult to peruse and can be utilized for bunches of various things. A person named Guido van Rossum made Python quite some time ago, and he maintained that it should be a language that is really great for both composing code that is straightforward and for finishing work rapidly.

The manner in which Python looks and works is basic, and that implies software engineers can compose more limited code to do exactly the same things they would in different dialects. This assists them with making programs quicker, and additionally decent for individuals who are simply beginning to figure out how to program.

Python accompanies a great deal of pre-caused instruments and a lot of additional things that others have made, so developers don’t need to build all that without any preparation. They can utilize Python to do various positions, such as making sites, analyzing data, teaching computers to learn, doing complex math, and making tasks automatic. Since Python is “open-source,” individuals all around the world can cooperate to improve it and offer what they know.

Why is Python Language so Popular?

Python is an extremely well-known programming language that many individuals use. There are a couple of motivations behind why it’s so popular. One big reason is that it’s easy to understand and read, which makes it great for both beginners and experienced programmers. The manner in which Python looks is like the way that we talk, so developers can make sense of things in a short and clear manner, and they don’t need to stress over muddled code.

Python likewise accompanies loads of helpful devices worked in, and there are many additional tools made by others that developers can utilize. This helps them work quicker and do more things. Another justification for why people like Python is that it tends to be utilized for the overwhelming majority of various things like making sites, concentrating on information, doing complex math, making brilliant computer programs, and that’s just the beginning.

Python is free for anyone to use and improve, which means lots of people work together to make it better.

Top Reasons to Choose Python Programming

  • Clean and Readable Syntax

Python is a type of computer language that’s really easy to understand and use, especially for people who are just starting to learn how to code. The way you write Python code looks a lot like regular English sentences, so it’s not confusing.

One cool thing about Python is that it cares about how you organize your code. It wants you to make it neat and easy to read by using spaces or tabs in a certain way. This makes your code less likely to have mistakes in it.

  • Diverse Libraries and Frameworks

Python has a rich ecosystem of libraries and frameworks that cater to specific needs. Like, for making websites, Django and Flask are liked. For working with data, people use NumPy and pandas. For stuff like AI and machine learning, TensorFlow and PyTorch are popular.

  • Automated Code Scripts

Python’s concise syntax and extensive libraries enable developers to quickly write and test code. This is especially valuable when creating scripts for automation, as it allows for faster Python development Services and iteration.

Python’s standard library includes modules for various tasks, such as file manipulation, network communication, web scraping, and more. This rich library minimizes the need to write code from scratch, accelerating the automation process.

  • Used For Data Sciences And Analytics

Python’s simplicity and extensive libraries have made it a go-to language for data scientists and machine learning practitioners. Its libraries like NumPy, pandas, sci-kit-learn, and TensorFlow offer robust tools for data analysis, modeling, and training machine learning models.

Libraries like pandas provide intuitive and efficient data structures and methods for data manipulation and analysis. This enables data scientists to easily clean, transform, and explore data.

  • Strong Community Support

The strength of the Python community goes beyond just the programming language itself. It creates an ecosystem where collaboration, learning, and innovation thrive, making Python an attractive choice for both new and experienced developers.

Python’s popularity has led to its adoption by various industries, including tech giants like Google, Facebook, and Dropbox. It’s also widely used in academia and research.

Common Python Mistakes Made by Python Programmers:

  1. Misusing expressions as defaults for function arguments

Here’s an example in Python:

def append_to_list(item, my_list=[]):


return my_list

result1 = append_to_list(1)

print(result1)  # Output: [1]


result2 = append_to_list(2)

print(result2)  # Output: [1, 2]


In this model, the capability append_to_list takes a thing to add to a rundown. The default incentive for the my_list boundary is an unfilled rundown []. The mix-up here is utilizing an impermanent item (list) as a default contention. Since a similar rundown is utilized across capability calls, any progressions made to the rundown in one call influence ensuing calls.

To keep away from this mix-up, you can involve changeless items or None as default contentions and afterward, make the impermanent article inside the capability:

def append_to_list(item, my_list=None):

if my_list is None:

my_list = []


return my_list

By using None as the default argument and creating a new list inside the function when my_list is None, you ensure that each function call gets its own separate list.

  1. Using class variables incorrectly

Confusing Class Variables with Instance Variables:

One common mistake is to confuse class variables with instance variables. Class variables are shared among all instances of a class, whereas instance variables have separate values for each instance.

class Example:

class_var = 0


instance1 = Example()

instance2 = Example()


instance1.class_var = 42

print(instance2.class_var)  # Output will still be 0, not 42


To avoid this mistake, always access class variables using the class name itself, like Example.class_var.

Modifying Class Variables Through Instances:

Another mistake is directly modifying class variables using instances.

class Example:

class_var = 0


instance = Example()

instance.class_var = 10


print(Example.class_var)      # Output will still be 0, not 10

print(instance.class_var)     # Output will be 10

To modify class variables, do so using the class name: Example.class_var = new_value.


  1. Specifying parameters incorrectly for an exception block

Exception handling is a crucial aspect of writing robust and reliable code. However, even experienced developers can make mistakes when it comes to specifying parameters incorrectly for an exception block. Here’s what this mistake entails and how to avoid it:

  • Misunderstanding Exception Types
  • Incorrect Exception Name
  • Incorrect Exception Hierarchy
  • Missing or Incorrect Arguments

  1. Misunderstanding Python scope rules

Misunderstanding Python scope rules is a common mistake that many newcomers to the language make. Python has a specific set of rules that dictate how variables and names are accessed and assigned within different parts of the code. The two main types of scope in Python are global scope and local scope. Here’s a breakdown of the common mistake and how to avoid it:

Common Python Mistake:

Misunderstanding how scope works can lead to issues like using a variable before it’s defined, or expecting a variable to retain its value across different scopes when it doesn’t.

Python Scope Rules:

Global Scope: Variables defined outside of any function or block are in the global scope. They can be accessed from anywhere in the code.

Local Scope: Variables defined within a function or block are in a local scope. They are only accessible within that function or block.

  1. Common Mistake Misusing the __del__ method

The __del__ method in Python is used as a finalizer, meaning it’s automatically called when an object is about to be destroyed. It’s meant for cleanup tasks before an object is removed from memory. However, there are some common mistakes and misconceptions associated with its usage:

Unreliable Execution Timing: It relies on Python’s garbage collector to decide when to invoke it. This can lead to unexpected behavior if you’re relying on it for critical cleanup tasks.

Circular References: If there are circular references between objects, the __del__ method might not get called at all due to the way Python’s garbage collector works.

External Resources:  Relying solely on __del__ can cause these resources to be held open longer than necessary.

Implicit Invocation: Trying to manually call obj.__del__() can lead to unexpected behavior.

Performance Impact: This is due to the overhead of the garbage collection process.

  1. Creating circular module dependencies

Import Errors: Python imports are resolved at runtime, and circular dependencies can lead to import errors or infinite loops, where modules keep importing each other endlessly.

Order of Execution: Circular dependencies make it difficult to determine the correct order in which modules should be executed.

Maintainability: It’s challenging to follow the flow of the program when modules are interdependent in a circular way.


Consider two modules, module_a.py and module_b.py, with the following content:


import module_b


def function_a():




import module_a

def function_b():


In this example, module_a depends on module_b, and vice versa, creating a circular dependency.


To avoid circular dependencies, follow these best practices:

  • Refactor Code
  • Use Dependency Injection
  • Split Modules
  • Dependency Graph
  • Use Import Statements Wisely
  • Interfaces and Abstract Base Classes
  1. Clashes of Names

Name clashing occurs in Python when you accidentally use a variable or function name that conflicts with the names already defined in the Python Standard Library modules or other imported modules. This can lead to unexpected behavior, errors, or overwriting of existing functionality. To avoid such clashes, follow these guidelines:

  • Choose Descriptive Names
  • Avoid Single-Character Names
  • Check Standard Library Names
  • Use Modules and Scopes
  • Import with Aliases

For example:

import math as my_math

result = my_math.sqrt(25)

Be Cautious with Wildcard Imports:

Avoid using wildcard imports (from module import *) as they can pollute your namespace and lead to unintended name clashes.

  • Use Virtual Environments
  • Naming Conventions
  • Use Linters
  • Testing and Debugging

Exploring the world of Enterprise software development services can be exciting and give you a lot of power to create things. But, like any journey, there are tricky parts along the way. This helpful guide talks about seven common mistakes that programmers, whether they’re just starting or have been coding for a while, tend to make. If you learn about and tackle these mistakes, it can make your Python code better. This means your code will work better, be faster, and be more trustworthy.

Contact Inexture Solutions experts for Python’s capacities to make progressed applications that are far better than whatever individuals anticipate from the business. They have a group of gifted designers who know how to utilize Python well. This assists them with composing code that is straightforward and deals with it, so the applications they make are reliable and can develop when required.

Bringing Software Development Expertise to Every
Corner of the World

United States



United Kingdom




New Zealand










South Africa