Boston Python Workshop 3/Friday/Tutorial: Difference between revisions

In summary, things that represent emptyness or zeroness, including the boolean <code>False</code>, empty string, and 0, will evaluate to <code>False</code> in a conditional expression. Everything else, including the boolean <code>True</code>, non-empty strings, and numbers other than 0, is <code>True</code>.

 

 

You can use the <code>else</code> keyword to conditionally execute code when the expression for the <code>if</code> block isn't true:

Like with <code>if</code>, the code block under the <code>else</code> statement must be indented.

 

You can check multiple expressions together using the <code>and</code> and <code>or</code> keywords. If two expressions are joined by an <code>and</code>, they <b>both</b> have to be True for the overall expression to be True. If two expressions are joined by an <code>or</code>, as long as <b>one</b> is True, the overall expression is True.