Design patterns in 1 tweet

Flyweight: support a large number objects efficiently by sharing constant parts of their state (called intrinsic state)

Ex: To represent a text document, a Flyweight object is created per character in the character set.

R was created in 1993 at the University of Auckland in New Zealand by Robert Gentleman and Ross Ihaka

R is mostly used for data data analysis.

In of January 2020, R ranked the 18th most popular programming language

AWS Storage Services

- S3: general
- Glacier: archiving & backup
- EBS: block storage (disks)
- Storage Gateway: connect on-premise with storage in AWS infrastructure

Know what version of Python you're using. There are differences. For instance, when dealing with strings:

Python 3: bytes contains sequences of 8-bit values, str -> seqs of Unicode chars

Python 2: str contains sequences of 8-bit values, unicode -> seqs Unicode chars