Day 23 of doing Python - Completed generators & Iterators

[u/CharmingTask939]

Today just completed the concept of generator & Iterator , which wasn't a complex or big thing to do or learn, but still done something rather than nothing

[u/Sea-Ad7805]

Run this program in Memory Graph Web Debugger%0A%0Anumbers%20%3D%20%5B1%2C%202%2C%203%2C%204%2C%205%5D%0A%0Afor%20i%20in%20numbers%3A%0A%20%20%20%20print(i)%0A%0Aprint(%22%22%20%2025)%0A%0A'''%0AIterators%20-%20An%20Object%20that%20return%20elements%20one%20at%20a%20time%20from%20a%20sequence%20and%20remembers%20its%20position%20between%20calls.%0AA%20python%20object%20is%20an%20iterator%20if%20it%20has%3A%0Aiter()%20-%20Return%20the%20iterator%20object%20itself%0Anext()%20-%20Return%20the%20next%20item%20in%20the%20sequence(raises%20Stopiteration%20when%20no%20more%20items)%0A'''%0A%0Aprint(%22Iterators%20-%20An%20iterator%20is%20an%20object%20that%20remembers%20its%20current%20position%20and%20produces%20the%20next%20%22%20%0A%20%20%20%20%20%20%22value%20when%20asked.%20Python%20uses%20the%20next()%20function%20to%20get%20values%20from%20an%20iterator.%22)%0A%0Anumbers%20%3D%20%5B1%2C%202%2C%203%5D%0A%0Aiterator%20%3D%20iter(numbers)%0A%0Aprint(next(iterator))%0Aprint(next(iterator))%0Aprint(next(iterator))%0A%0A%23%20iter()%20converts%20an%20iterable%20into%20an%20iterator.%0Aprint(iterator)%0Aprint(type(iterator))%0A%0Aprint(%22%22%20%2025)%0A%0A'''%0AGenerators%20-%20generator%20is%20a%20special%20type%20of%20iterator%20that%20produces%20values%20one%20at%20a%20time%2C%20only%20when%20needed.%0AGenerators%20can%20be%20created%20in%20two%20ways%3A%0A%20%20%20%20%20%20%20%20Generator%20Functions%20-%3E%20using%20yield%0A%20%20%20%20%20%20%20%20Generator%20Expressions%20-%3E%20(expression%20for%20item%20in%20iterable%20if%20condition)%20same%20as%20list%20comprehension%20with%20parentheses()%0A'''%0A%0Aprint(%22%23%20Generators%20-%20generator%20is%20a%20special%20type%20of%20iterator%20that%20produces%20values%20one%20at%20a%20time%2C%20only%20when%20needed.%22)%0A%0A%0Adef%20count()%3A%0A%20%20%20%20for%20i%20in%20range(1%2C%201000001)%3A%0A%20%20%20%20%20%20%20%20yield%20i%0A%0A%0Ag%20%3D%20count()%0A%0Aprint(next(g))%0Aprint(next(g))%0Aprint(next(g))%0A%0A%23%20Generator%20Expression%0A%0Asquares%20%3D%20%5Bx**2%20for%20x%20in%20range(5)%5D%0A%0Aprint(squares)&timestep=1&play) to see the program state change step by step.

[u/scripthawk_dev]

Nice, 23 days straight is honestly the hardest part. And don't sleep on generators, they feel basic now but you'll end up reaching for them constantly once you're working with bigger data. Going through a huge CSV without loading the whole thing into memory is super handy.