Mojo: When Python Isn't Enough for Performance

Python Isn’t Slow — Mental Model Is Key to Success!! The Performance Myths That Hold Developers Back Most performance problems in Python aren’t caused by Python. They’re caused by misunderstandings of how Python actually works. Before reaching for multiprocessing, C extensions, or a new framework… you need to understand what the interpreter is doing. Over the years, we have seen teams blame the language when systems slowed down. “Python can’t scale.” “We need to rewrite this in Go.” “This framework is too heavy.” But when we actually profiled the system, the issues were almost always fundamental. Not architectural at first glance. Fundamental. 1) Big-O Matters More Than Micro-Optimizations If you check membership in a list inside a loop, you’ve already made a design decision. i)A list lookup is O(n). ii)A set lookup is O(1). That’s not a syntax choice. That’s a scalability decision. You don’t fix that with faster hardware or async magic. You fix it by choosing the right data structure. 2) Built-ins Are Faster Than You Think Python’s built-in functions are implemented in C. sum(), min(), max(), any(), all() — these are optimized.Replacing them with manual loops often makes code slower and harder to read.“Pythonic” code isn’t just elegant. It’s often more efficient. 3) Object Creation Has a Cost i)Everything in Python is an object. ii)Every temporary list. iii)Every unnecessary copy. iv)Every large dictionary passed around. If you don’t understand how memory and references work, you’ll create performance issues without realizing it.Many slow systems aren’t slow because of computation.They’re slow because of unnecessary object churn. 4) Nested Logic Is a Performance Smell Complex nested conditions don’t just hurt readability. They often indicate: i)Repeated work ii)Poor separation of concerns iii)Missing abstraction Clear control flow usually leads to predictable execution paths,And predictable systems are easier to optimize. 5) Premature Optimization Is Ego, Not Engineering Optimizing before measuring is guesswork. Use profiling tools. Measure bottlenecks. Then optimize where it matters. Architecture is about trade-offs, not heroics. Here’s the uncomfortable truth:Most Python systems don’t fail because of the interpreter. They fail because of weak mental models. When you understand: i)Data structures ii)Time complexity iii)Memory behavior iv)Execution flow You stop fighting Python. And you start engineering systems that scale. Frameworks change. Cloud providers evolve. Languages trend. What performance misconception did you have to unlearn? #Python #SoftwareArchitecture #CleanCode #SystemDesign #EngineeringLeadershipa

If you're building anything with AI now, Python isn't optional. It seems to be the language in which everything is written now. I'm a .NET developer at heart. Been writing C# for years. IYKYK, what I mean when I say Python feels... disorganized. No structure. No rules. Just vibes and indentation. I kept avoiding it. The more I resisted, the more it raised its head and haunted me in my dreams. A couple of weeks ago, we launched a hackathon on healthcare AI agents. More than half of the questions or issues have been from people building in Python. So, I decided to start learning it (the right way). Took some courses. Watched tutorials. But kept running into the same frustrating wall: There are multiple ways people set up Python projects. You learn one, then you open a sample project, and you're lost again. You need to be able to READ other people's Python, not just write your own. That gap kept breaking my momentum. So, I had long, open conversations with my best friend, Mr. Claude. I know it doesn't judge me. So I asked every dumb question as I read through samples. We had our disagreements, but we kept moving. Building up a mental model of how to approach this. After I felt a little more comfortable, I asked Claude to take all my discussions from the last few days and help me turn them into a master cheat sheet. The result is the attached guide. This is not a typical "getting started with Python" guide. It's built around a person trying to learn Python, and the questions I kept hitting: → What is the right way to start a new project TODAY, but still be able to read older samples? → What is a virtual environment and why does it exist? → How do you actually work with ADK and LangChain? → All the syntax nuances that trip you up, coming from another language → A full .NET to Python mapping - because the way code is read and processed is fundamentally different, and that realization changed everything for me I want to be fully transparent: this was built with Claude. I brought the questions, the confusion, and the real-world context of learning. Claude helped me organize, explain, and structure it into something shareable. I can't take any credit for this. Please also don't blame me for any inaccuracies. This is not an expert's guide. I'm not a Python expert. I didn't choose Python. Python chose me. Python experts, if you spot something to improve, please share. I would appreciate it. And if you are into building agents, we're running Agents Assemble, a hackathon for building real AI agents for healthcare using MCP, A2A, and #FHIR. → 6-8 weeks to build something real → Choose your stack. Does NOT need to be Python :). We also have no code options → $25,000 in prizes → Teams welcome Check it out - the link is in the comments. Want to discuss AI agents for healthcare. Connect with us Prompt Opinion Let's build something together! Mahbubul Haque Magnus Wieslander

What is the use of self in Python? If you are working with Python, there is no escaping from the word “self”. It is used in method definitions and in variable initialization. The self method is explicitly used every time we define a method. The self is used to represent the instance of the class. With this keyword, you can access the attributes and methods of the class in python. It binds the attributes with the given arguments. The reason why we use self is that Python does not use the ‘@’ syntax to refer to instance attributes self is used in different places and often thought to be a keyword. But unlike in C++, self is not a keyword in Python. self is a parameter in function and the user can use a different parameter name in place of it. Although it is advisable to use self because it increases the readability of code. In Python, self is the keyword referring to the current instance of a class. Creating an object from a class is actually constructing a unique object that possesses its attributes and methods. The self inside the class helps link those attributes and methods to a particular created object. Self in Constructors and Methods self is a special keyword in Python that refers to the instance of the class. self must be the first parameter of both constructor methods (__init__()) and any instance methods of a class. For a clearer explanation, see this: When creating an object, the constructor, commonly known as the __init__() method, is used to initialize it. Python automatically gives the object itself as the first argument whenever you create an object. For this reason, in the __init__() function and other instance methods, self must be the first parameter. If you don’t include self, Python will raise an error because it doesn’t know where to put the object reference. Is Self a Convention? In Python, instance methods such as __init__ need to know which particular object they are working on. To be able to do this, a method has a parameter called self, which refers to the current object or instance of the class. You could technically call it anything you want; however, everyone uses self because it clearly shows that the method belongs to an object of the class. Using self also helps with consistency; hence, others-and, in fact, you too-will be less likely to misunderstand your code. Why is self explicitly defined everytime? In Python, self is used every time you define it because it helps the method know which object you are actually dealing with. When you call a method on an instance of a class, Python passes that very same instance as the first argument, but you need to define self to catch that. By explicitly including self, you are telling Python: “This method belongs to this particular object.” What Happens Internally when we use Self? When you use self in Python, it’s a way for instance methods—like __init__ or other methods in a class—to refer to the actual object that called the method. #Python #Data_analaysis

Python for the Brain, .NET for the Nervous System. 🧠⚙️ Most AI models are born in Python, but the ones that survive at enterprise scale are increasingly running on .NET. While Python is the undisputed king of research and prototyping, it often hits a wall when it meets the brutal demands of a production environment. If you’re building high-performance, scalable, and mission-critical AI systems, here is why .NET (C#) is outshining the competition: 1. The Performance Gap (Compiled > Interpreted) Python is interpreted; .NET is JIT-compiled. In the world of real-time AI inference, every millisecond of latency matters. .NET’s native multithreading allows it to handle massive concurrent loads without being throttled by Python’s infamous Global Interpreter Lock (GIL). 2. Enterprise-Grade Reliability * Static Typing: Catch errors at compile-time, not at 3:00 AM in your production logs. * Memory Management: The Common Language Runtime (CLR) provides more efficient garbage collection, preventing the "latency spikes" that plague Python under heavy loads. * Security & Monitoring: .NET offers mature, built-in tools for authorization and API boundaries that are often an afterthought in Python POCs. 3. The "Hybrid" Winning Strategy 🏆 The best teams aren't choosing one over the other; they are using a split approach: * Python: Used as the "Experimental Brain" for training and model R&D. * ONNX Runtime & .NET: Used as the "Production Nervous System." By exporting models to ONNX, you get the best of both worlds—research flexibility and high-speed, type-safe execution. Why the shift to .NET for Production? * Execution Speed: High performance via Compiled/JIT execution vs. Python’s slower interpreted nature. * Concurrency: Excellent native threading capabilities, whereas Python remains bottlenecked by the GIL. * System Robustness: A static type system that ensures stability, compared to the dynamic prototyping focus of Python. * Scalability: Built specifically for the "Nervous System" of an enterprise, while Python excels as the "Experimental Brain." The Verdict: If you want to build a cool demo, use Python. If you want to build a resilient, multi-tenant AI platform that integrates seamlessly with the Azure ecosystem, it’s time to look at .NET. Are you moving AI into production this year? What’s your stack of choice? Let’s debate in the comments. 👇 #DotNet #CSharp #AI #SoftwareEngineering #MachineLearning #Azure #Python #TechArchitecture #ProductionAI

🐍 3 Python Built-ins That Look Simple… But Are More Powerful Than They Seem One thing I appreciate about Python is how some of the most useful tools look deceptively simple. At first glance, they seem basic. But once you understand the one feature that really matters, they become incredibly practical in real projects. Here are 3 built-ins that quietly make Python code cleaner and more expressive. 🔢 1. sorted() — More Than Just Sorting Numbers Most people think sorted() is mainly for sorting numbers or strings. But the real power comes from key=. In real applications, you're rarely sorting plain numbers. Instead, you're sorting things like: 👤 Users 📋 Tasks 📁 Files 📦 Dictionaries The key parameter tells Python which part of each item should determine the order. Examples in real projects: ✔️ Sort users by age ✔️ Sort tasks by priority ✔️ Sort files by modification date Instead of restructuring your data or writing extra logic, sorted() lets you clearly express how your data should be ordered. 🔗 2. zip() — Pair Related Data Cleanly A very common pattern looks like this: names[i] ages[i] It works… but it also means manually managing indexes. zip() removes that extra work. It lets you iterate through related values together, without worrying about positions. Example scenarios: 👤 Names + ages 🛒 Products + prices 📅 Dates + sales numbers Another benefit: if the lists have different lengths, zip() automatically stops at the shortest one. The result? ✔️ Less indexing ✔️ Cleaner loops ✔️ Easier-to-read code 🔁 3. enumerate() — When You Need Index + Value You’ve probably seen this pattern before: for i in range(len(items)): It works, but it’s not the cleanest approach. enumerate() already gives you both the index and the value in one step. This makes loops much more natural. Common use cases include: 📋 Printing numbered lists 📊 Tracking item positions 🧭 Working with ordered data A small change—but it often makes loops simpler and clearer. 💡 The Bigger Lesson Many Python built-ins are like this. They look simple at first, so people only use them at a surface level. But once you understand the feature that really matters, your code becomes: ✔️ clearer ✔️ shorter ✔️ easier to reason about And that’s a pretty good trade. 💬 Which Python built-in improved your code the most once you truly understood it? #Python #Programming #SoftwareEngineering #PythonTips #CleanCode #DeveloperProductivity #CodingTips

🧙♂️ Magic Methods in Python (Dunder Methods) Python is known for its powerful and flexible object-oriented features. One of the most interesting concepts in Python is Magic Methods, also called Dunder Methods (Double Underscore Methods). Magic methods allow developers to define how objects behave with built-in operations such as addition, printing, comparison, and more. These methods always start and end with double underscores (__). Example: __init__ __str__ __add__ __len__ They are automatically called by Python when certain operations are performed. --- 🔹 Why Magic Methods are Important? Magic methods help to: ✔ Customize the behavior of objects ✔ Make classes behave like built-in types ✔ Improve code readability ✔ Implement operator overloading They allow developers to write clean, powerful, and Pythonic code. --- 🔹 Commonly Used Magic Methods 1️⃣ __init__ – Constructor This method is automatically called when an object is created. class Student: def __init__(self, name): self.name = name s = Student("Vamshi") --- 2️⃣ __str__ – String Representation Defines what should be displayed when we print the object. class Student: def __init__(self, name): self.name = name def __str__(self): return f"Student name is {self.name}" s = Student("Vamshi") print(s) --- 3️⃣ __len__ – Length of Object Allows objects to work with the len() function. class Team: def __init__(self, members): self.members = members def __len__(self): return len(self.members) t = Team(["A", "B", "C"]) print(len(t)) 4️⃣ __add__ – Operator Overloading Defines how the + operator works for objects. class Number: def __init__(self, value): self.value = value def __add__(self, other): return self.value + other.value n1 = Number(10) n2 = Number(20) print(n1 + n2) 🔹 Key Takeaway Magic methods make Python classes more powerful and flexible by allowing objects to interact naturally with Python's built-in operations. Understanding magic methods helps developers write cleaner and more advanced object-oriented programs. #Python #PythonProgramming #MagicMethods #DunderMethods #OOP #Coding #LearnPython #SoftwareDevelopment

🧠 Python doesn’t “free memory”. It negotiates with it. Most developers know that Python has Garbage Collection. Very few know how it actually works internally. Let’s break it down. 1. Reference Counting (Primary Memory Manager) At the core of Python’s memory management is reference counting. Every object in Python maintains a counter that tracks how many references point to it. Example: a = [1,2,3] b = a Now the list object has 2 references. Internally (in CPython): PyObject ├── ob_refcnt ← reference count └── ob_type Whenever a new reference is created → refcnt +1 Whenever a reference is deleted → refcnt -1 When the count hits 0, Python immediately deallocates the object. That’s why: a = [1,2,3] del a Memory is freed instantly. ⚡ This makes Python’s memory management very fast and deterministic. But there is a problem. 2. The Circular Reference Problem Reference counting cannot detect cycles. Example: a = [] b = [] a.append(b) b.append(a) Even if you delete both: del a del b Both objects still reference each other. So their reference count never reaches 0. Memory leak. This is where Python’s Garbage Collector comes in. 3. Generational Garbage Collector Python adds a cycle detector on top of reference counting. It uses a generational model. Objects are divided into 3 generations: Generation 0 → New objects Generation 1 → Survived one GC cycle Generation 2 → Long lived objects Why? Because most objects die young. This is called the Generational Hypothesis. So Python runs GC more frequently on young objects. Example thresholds: Gen0 threshold ≈ 700 allocations Gen1 threshold ≈ 10 Gen0 collections Gen2 threshold ≈ 10 Gen1 collections This keeps GC fast and efficient. 4. How Cycle Detection Works Internally Python uses a mark-and-sweep style algorithm. Steps: 1️⃣ Identify container objects (lists, dicts, classes) 2️⃣ Track references between them 3️⃣ Temporarily reduce reference counts 4️⃣ Objects that reach zero → unreachable cycle 5️⃣ Free them All of this is implemented in: Modules/gcmodule.c Inside CPython. 5. Interesting Internals You can actually inspect GC behavior: import gc gc.get_threshold() gc.get_count() gc.collect() You can even disable GC: gc.disable() Which some high-frequency trading systems and low latency apps do to avoid GC pauses. (Manual control > unpredictable pauses) 6. Why Python Rarely Leaks Memory Because it combines: ✔ Reference counting (instant cleanup) ✔ Generational GC (cycle detection) This hybrid model makes Python one of the most predictable memory managers among dynamic languages. Most developers use Python. Very few explore CPython internals. But once you understand things like: • PyObject • reference counters • generational GC You start seeing Python less like a language… and more like a beautifully engineered runtime system. #Python #CPython #GarbageCollection #Programming #PythonInternals #SoftwareEngineering

🐍⚡ 8 Powerful Python Optimization Techniques (Write Faster, Cleaner Code) Writing Python is easy. Writing efficient Python is what makes you stand out in interviews & real projects. Here are 8 practical optimization techniques every developer should know 👇 🚀 1️⃣ Use Built-in Functions (They’re Faster) Python’s built-ins are implemented in C → much faster than manual loops. ❌ Slow: total = 0 for i in nums: total += i ✅ Better: total = sum(nums) Use: sum(), min(), max(), map(), filter(), any(), all() 🔄 2️⃣ Use List Comprehensions Instead of Loops Cleaner + faster. ❌ squares = [] for i in range(10): squares.append(i*i) ✅ squares = [i*i for i in range(10)] ⚡ 3️⃣ Use Generators for Large Data Generators save memory by yielding values one at a time. def generate_numbers(): for i in range(1000000): yield i Use when working with large files or datasets. 🧠 4️⃣ Use Sets for Fast Lookups Checking membership in list → O(n) Checking membership in set → O(1) my_set = set(my_list) if item in my_set: print("Found!") Huge performance boost in real projects. 🏗 5️⃣ Avoid Global Variables Local variables are faster because Python looks them up quicker. Keep logic inside functions. 📦 6️⃣ Use the Right Data Structure • List → ordered, changeable • Tuple → immutable, slightly faster • Set → unique values • Dictionary → key-value fast lookup Choosing the right structure = instant optimization. 🔁 7️⃣ Use Caching (Memoization) Avoid recomputation. from functools import lru_cache @lru_cache(maxsize=None) def fib(n): if n < 2: return n return fib(n-1) + fib(n-2) Game changer for recursive functions. 🔍 8️⃣ Profile Before Optimizing Don’t guess. Measure. Use: • cProfile • time module • memory_profiler Optimize only bottlenecks. 🎯 Pro Tip: Readable code > Premature optimization. First write clean logic → then optimize critical parts. 🎓 Practice & Learn More 📘 Python Performance Tips 🔗 https://lnkd.in/gJSg_SkW 📘 Real Python Optimization Guide 🔗 https://lnkd.in/gRbkBk4X 📘 GeeksforGeeks Python Optimization 🔗 https://lnkd.in/gDu2T74E ✍️ About Me Susmitha Chakrala | Professional Resume Builder & LinkedIn Optimization Expert Helping students & professionals build strong career profiles with: 📄 ATS Resumes | 🔗 LinkedIn Optimization | 💬 Interview Prep 📩 DM me for resume review or career guidance. #Python #PythonTips #Coding #SoftwareDevelopment #Performance #LearnPython #TechCareers

How Lambda Really Works Inside Python Loops One of the most confusing Python behaviors appears when using lambda inside loops. Let’s look at this example: funcs = [lambda x: x * i for i in range(3)] print(funcs[1](2)) Many developers expect the output to be 2, but the actual output is: 4 Let’s break it down step by step. 1️⃣ Step 1: What does this line create? funcs = [lambda x: x * i for i in range(3)] This is a list comprehension. The loop runs with: • i = 0 • i = 1 • i = 2 On each iteration, we append: lambda x: x * i After the loop finishes, funcs contains three function objects. Important: ❌ It does NOT contain numbers. ✅ It contains function objects. If we print it: print(funcs) ➡️ We get something like: [<function ...>, <function ...>, <function ...>] Because we stored functions, not results. 2️⃣ Step 2: The Critical Concept: Late Binding Here’s the key idea: The lambda does not store the value of i at the time it is created. It stores a reference to the variable i. ➡️ By the time the loop finishes, i equals: 2 So all three functions now effectively behave like: lambda x: x * 2 This behavior is called late binding. Python looks up the value of i when the function is executed, not when it is defined. 3️⃣ Step 3: What does this line do? print(funcs[1](2)) First: funcs[1] Returns the second function in the list. Which is effectively: lambda x: x * 2 Then (2) ➡️ Calls the function with x = 2. So the result becomes: 2 * 2 = 4 That’s why the output is: 4 🔑 Key Points to Remember • lambda creates a function. • The loop creates several functions. • They all use the same variable. • After the loop ends, the variable has its last value. • So all functions use that last value. • If you want each function to remember its own value, you must store it at creation time using: ➡️ lambda x, i=i: x * i Understanding this concept is essential when working with closures, functional programming, or building dynamic logic in Python. Have you ever been surprised by Python’s late binding behavior? 👀 #Python #Programming #Coding #SoftwareDevelopment #AI #MachineLearning #DataScience

day 10 types of error in python 1.zero division error print (10/0) 2.value error 3.keyword error 4.index error 5.attribute error 6.typerrror 7.ioerror 8.module error 9.import error 🐍 Common Python Errors Every Developer Should Know While learning Python, understanding errors is just as important as writing code. These errors help developers identify and fix issues quickly. Here are some common Python errors with examples. 👇 1️⃣ ZeroDivisionError Occurs when a number is divided by zero. print(10/0) Output: ZeroDivisionError: division by zero 📌 Python does not allow division by zero because it is mathematically undefined. 2️⃣ ValueError Occurs when a function receives a correct data type but an inappropriate value. num = int("hello") Output: ValueError: invalid literal for int() 📌 Here Python expects a numeric string but receives text. 3️⃣ KeyError Occurs when trying to access a key that does not exist in a dictionary. data = {"name": "Prem", "age": 25} print(data["salary"]) Output: KeyError: 'salary' 📌 The dictionary does not contain the key "salary". 4️⃣ IndexError Occurs when trying to access an index that is out of range. numbers = [10, 20, 30] print(numbers[5]) Output: IndexError: list index out of range 📌 The list has only 3 elements but we are trying to access the 6th position. 5️⃣ AttributeError Occurs when an object does not have the attribute or method you are trying to use. text = "python" text.append("3") Output: AttributeError: 'str' object has no attribute 'append' 📌 append() works for lists, not strings. 6️⃣ TypeError Occurs when an operation is applied to an inappropriate data type. print("Age: " + 25) Output: TypeError: can only concatenate str (not "int") to str 📌 Python cannot combine string and integer directly. 7️⃣ IOError / OSError Occurs when file operations fail. file = open("data.txt", "r") Output: FileNotFoundError: [Errno 2] No such file or directory 📌 Happens when the file does not exist. 8️⃣ ModuleNotFoundError Occurs when Python cannot find the module you are trying to import. import tensorflowxyz Output: ModuleNotFoundError: No module named 'tensorflowxyz' 📌 The module is not installed or the name is incorrect. 9️⃣ ImportError Occurs when Python cannot import a specific component from a module. from math import square Output: ImportError: cannot import name 'square' 📌 The math module does not contain square. 💡 Tip: Errors are not failures — they are guides that help developers write better code. more information follow Prem chandar 🔖 Hashtags #Python #PythonProgramming #LearnPython #Coding #Programming #Developers #SoftwareEngineering #TechLearning #AI #MachineLearning #CodingJourney