Tomorrow, I’m re-launching Python Essentials for Data Scientists to celebrate a HUGE course upgrade:
- NEW: 22 additional video lessons
- NEW: 7-part project to practice everything you’re learning
There will be a limited-time offer to celebrate the re-launch, so watch out for tomorrow’s email! 💸
I’ll be sending a few extra emails this week. I know your inbox is precious, so I’ll be giving you FREE access to 3 modules from the course! That way, you can benefit regardless of whether you choose to enroll. 💌
Thank YOU for being a valued reader! 🙏 Now let’s get to today’s tip…
👉 Tip #20: Use dictionary comprehensions in Python
Let’s say we had this list of words:
If we wanted to create a list of the word lengths, we could use a for loop:
We start with an empty list, and each time the loop runs,is appended to the list.
But as you might know, a list comprehension is even better for this scenario:
The effect is the same, but the code is much more concise.
Let’s now pretend that we wanted to create a dictionary containing both the word and its length. Once again, let’s use a for loop:
This time, we start with an empty dictionary, and each time the loop runs, a key-value pair is added to the dictionary.
You can actually convert this into a dictionary comprehension:
The structure is similar to a list comprehension, except there are curly bracesinstead of brackets , and the first part of the comprehension (called the “expression”) is instead of just .
You can read it as follows: “For each word, create a key-value pair of the word and its length.”
Visually, I really like the dictionary comprehension, since the “key:value” structure of the expression matches the way the dictionary prints out!
Let me know if you have any questions! 💬
Today’s tip is just one of the 22 NEW lessons from Python Essentials for Data Scientists!
If you want to build a solid foundation in Python and stay relevant in the world of AI, watch out for tomorrow’s email!
Do you know someone who could benefit from learning Python? Please send them to pythoncourse.io so that they can hear about the launch! 🚀