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decorators.py — gocourse compiler READY
1 2 3 4 5 6 7
def timer(fn):
      def wrap(*a, **kw):
          t = time.perf_counter()
          r = fn(*a, **kw)
          print(f"took {time.perf_counter()-t:.3f}s")
          return r
      return wrap
AI AI Explanation STREAMING

A decorator wraps fn so extra behaviour runs before and after the call, without editing the original function

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Python
Readable syntax and a huge standard library, used from scripting to machine learning.
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Java
Statically typed and everywhere in enterprise back ends, Android and big data.
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C++
Manual control over memory and performance, for engines, systems and embedded work.
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JavaScript
The language every browser runs, and with Node the one behind many servers too.
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React
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SQL
Querying, joining and shaping relational data — the skill every back end depends on.
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Data Science
Pandas, NumPy and notebooks: cleaning, exploring and drawing conclusions from data.
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Web Development
HTML, CSS and the browser platform, from layout and accessibility to performance.
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GO Go
Small, fast and built for concurrency — a favourite for services and CLI tools.
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Memory safety without a garbage collector, for systems work that cannot crash.
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TY TypeScript
JavaScript with types, catching mistakes before the code ever reaches a browser.
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KO Kotlin
Concise and null-safe on the JVM, and the language Android development prefers.
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Apple platforms end to end: iOS, macOS and SwiftUI interfaces.
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PHP
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DE DevOps
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Machine Learning
Models from regression to transformers, and what it takes to train and serve them.
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C# C#
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RU Ruby
Expressive and readable, with Rails still one of the fastest ways to build a product.
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VU Vue
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Angular
A batteries-included framework for large applications that need structure.
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Node.js
JavaScript on the server: APIs, real-time services and the npm ecosystem.
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Docker
Containers that run the same on a laptop as in production, plus Compose and images.
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Cloud
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CY Cybersecurity
Threat models, common vulnerabilities and how to defend an application against them.
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def greet(name):
      print("Hello, " + name)

This Python function greet takes one argument name and prints a greeting.

•The def keyword defines a function
•print() outputs text to the console
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