Generators are a really cool Python ๐ย tool.
Let me show you why you should bother learning them! ๐
A short thread: ๐
Let me show you why you should bother learning them! ๐
A short thread: ๐
I have a CSV file that lists all โpurchasesโ of my free book โPydon'tsโ.
I want to go over that data to find the people who paid money for the book.
Then, I want to do something with that data.
I could write the code below ๐
But what's an issue with it?
I want to go over that data to find the people who paid money for the book.
Then, I want to do something with that data.
I could write the code below ๐
But what's an issue with it?
I'm loading ALL the data into memory and there really is no point in doing that.
I can filter out free downloads while going over the file the first time.
Something like you can see below ๐
Butโฆ what's an issue with this approach?!
I can filter out free downloads while going over the file the first time.
Something like you can see below ๐
Butโฆ what's an issue with this approach?!
The issue is that I look at this data often, and I only need the more recent paid sales.
When I find an โoldโ sale, I just exit the script.
So, I am loading ALL paid sales for nothing!
Using a generator lets me retrieve paid sales, one at a time! ๐
But, why bother?
When I find an โoldโ sale, I just exit the script.
So, I am loading ALL paid sales for nothing!
Using a generator lets me retrieve paid sales, one at a time! ๐
But, why bother?
Generators are awesome ๐ฅ for two reasons:
๐ย save memory: because you don't have to hold everything in memory all at once; and
๐ย save time: because you don't need to compute everything upfront if you are exiting early.
So, want to learn about generators?
๐ย save memory: because you don't have to hold everything in memory all at once; and
๐ย save time: because you don't need to compute everything upfront if you are exiting early.
So, want to learn about generators?
I'm writing about them in the Mathspp Insider ๐๐ย newsletter.
This thread was about last week.
Tomorrow, I'm sending another issue about generators and how to handle them in your code.
You can read last week's issue (about generators) & subscribe here: insider.mathspp.com
This thread was about last week.
Tomorrow, I'm sending another issue about generators and how to handle them in your code.
You can read last week's issue (about generators) & subscribe here: insider.mathspp.com
So, to wrap up,
๐ย generators let you handle data bit by bit, instead of doing everything all at once;
ย ๐ย you use `yield` to send an item at a time;
ย ๐ย you may save a lot of memory/time by using generators.
And finally:
๐ย generators let you handle data bit by bit, instead of doing everything all at once;
ย ๐ย you use `yield` to send an item at a time;
ย ๐ย you may save a lot of memory/time by using generators.
And finally:
If you got something out of this thread:
๐ย follow me @mathsppblog for more Python ๐ย knowledge; and
๐ย retweet the tweet below to share this thread with your audience!
That's it for now! ๐
I'll see you around. ๐
๐ย follow me @mathsppblog for more Python ๐ย knowledge; and
๐ย retweet the tweet below to share this thread with your audience!
That's it for now! ๐
I'll see you around. ๐
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