What does (A ``quote'' is the character used to open the string, i.e. either ' or ".) mean?

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Subject	What does (A ``quote'' is the character used to open the string, i.e. either ' or ".) mean?
From	fl <rxjwg98@gmail.com>
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Hi,

For me, it is difficult to understand the last line of the paragraph below in 
parenthesis (A ``quote'' is the character used to open the string, 
i.e. either ' or ".)

It talks about triple-quoted strings. Where is ``quote'' from? It has two ` and '.
What this different ` and ' do for here?

The link is here:
https://docs.python.org/2.0/ref/strings.html

Thank you for helping me to learn Python.


............................
In plain English: String literals can be enclosed in matching single quotes (') or
double quotes ("). They can also be enclosed in matching groups of three single 
or double quotes (these are generally referred to as triple-quoted strings). The
backslash (\) character is used to escape characters that otherwise have a special eaning, such as newline, backslash itself, or the quote character. String literals 
may optionally be prefixed with a letter `r' or `R'; such strings are called raw
strings and use different rules for backslash escape sequences.

In triple-quoted strings, unescaped newlines and quotes are allowed (and are
retained), except that three unescaped quotes in a row terminate the string. (A
``quote'' is the character used to open the string, i.e. either ' or ".)

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What does (A ``quote'' is the character used to open the string, i.e. either ' or ".) mean? fl <rxjwg98@gmail.com> - 2014-07-10 07:04 -0700
  Re: What does (A ``quote'' is the character used to open the string,  i.e. either ' or ".) mean? Chris “Kwpolska” Warrick <kwpolska@gmail.com> - 2014-07-10 16:14 +0200
    Re: What does (A ``quote'' is the character used to open the string,  i.e. either ' or ".) mean? fl <rxjwg98@gmail.com> - 2014-07-10 08:23 -0700
      Re: What does (A ``quote'' is the character used to open the string,  i.e. either ' or ".) mean? MRAB <python@mrabarnett.plus.com> - 2014-07-10 17:48 +0100
      Re: What does (A ``quote'' is the character used to open the string,  i.e. either ' or ".) mean? Ian Kelly <ian.g.kelly@gmail.com> - 2014-07-10 10:22 -0600
  Re: What does (A ``quote'' is the character used to open the string,  i.e. either ' or ".) mean? Joel Goldstick <joel.goldstick@gmail.com> - 2014-07-10 10:14 -0400

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