One thing that distinguishes Perl from other languages is its use of
sigils; the funny looking symbols placed in front of variable
names. As experienced Perl programmers, we assume sigils are an
essential part of Perl, but when I dream about my ideal version of
Perl, I go back-and-forth as to how sigils would work, and even
whether they’re required at all.
Source: On Sigils, an
article by David Farrell.
Null in Python: Understanding Python's NoneType Object
Python uses the keyword
None to define
null objects and
None does serve some of the same purposes as
in other languages, it’s another beast entirely. As the
None is not defined to be
0 or any other value. In Python,
None is an object and a first-class citizen!
Source: Null in Python: Understanding Python's NoneType Object
7 Principles of Icon Design
Creating a high-quality icon family requires a thoughtful approach,
a trained eye, a bit of iteration, and a lot of practice. Below,
I’ll illustrate the hallmarks of quality through 7 principles and
plenty of real-world examples. The goal is to tune you to the key
attributes of great icon design.
Source: 7 Principles of Icon
an article by Helena Zhang.