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From: MRAB <python@mrabarnett.plus.com>
Newsgroups: comp.lang.python
Subject: Re: Just starting to learn Python, and encounter a problem
Date: Sat, 23 Jul 2016 20:06:31 +0100
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On 2016-07-23 19:18, gst wrote:
> Heuh case 2 :
>
> "String1" or "String2"
>
> Evaluates to "String1" ?
>
Suppose you have:

     x or y

If bool(x) returns True, then the result will be x, else the result will 
be y.

Example 1:

bool("String1") returns True, therefore the result of:

     "String1" or "String2"

is "String1".

Example 2:

bool("") returns False, so the result of:

     "" or "String2"

is "String2".

(The empty string "" is considered 'false-y'; all other strings (i.e. 
all non-empty strings) are considered 'true-y'.)