Selector shorthand in SASS

selector-shorthand-sass.scss

$texty-inputs:
    'input[type="text"],
    input[type="password"],
    input[type="email"],
    input[type="url"],
    input[type="date"],
    input[type="month"],
    input[type="time"],
    input[type="datetime"],
    input[type="datetime-local"],
    input[type="week"],
    input[type="number"],
    input[type="search"],
    input[type="tel"],
    input[type="color"]';

.pure-form {
    #{$texty-inputs},
    label,
    select {
        display: block;
        margin-bottom: 1em;
    }
}

.pure-group {
    #{$texty-inputs},
    label,
    select {
        margin-bottom: 0;
    }
}

// yields

.pure-form input[type="text"],
.pure-form input[type="password"],
.pure-form input[type="email"],
.pure-form input[type="url"],
.pure-form input[type="date"],
.pure-form input[type="month"],
.pure-form input[type="time"],
.pure-form input[type="datetime"],
.pure-form input[type="datetime-local"],
.pure-form input[type="week"],
.pure-form input[type="number"],
.pure-form input[type="search"],
.pure-form input[type="tel"],
.pure-form input[type="color"],
.pure-form label,
.pure-form select {
  display: block;
  margin-bottom: 1em; }

.pure-group input[type="text"],
.pure-group input[type="password"],
.pure-group input[type="email"],
.pure-group input[type="url"],
.pure-group input[type="date"],
.pure-group input[type="month"],
.pure-group input[type="time"],
.pure-group input[type="datetime"],
.pure-group input[type="datetime-local"],
.pure-group input[type="week"],
.pure-group input[type="number"],
.pure-group input[type="search"],
.pure-group input[type="tel"],
.pure-group input[type="color"],
.pure-group label,
.pure-group select {
  margin-bottom: 0; }