code readability

Which method is easier to read?

name = 'Jack'

age = 45

# 1

print('Hello, %s. You are %s.' % (name, age))

# 2

print(f'Hello, {name}. You are {age}.')

Code readability is more important than micro-optimization because in most part of cases micro-optimization does not worth it.

In general, readability is more important than cleverness or brevity.

<?php

isset( $var ) || $var = some_function();

?>

Although the above line is clever, it takes a while to grok if you're not familiar with it. So, just write it like this:

<?php

if ( ! isset( $var ) ) {

    $var = some_function();

}

?>

if ($a OR $b) {} // 'OR' better than '||'

if ($a AND $b) {} // 'AND' better than '&&'