After a huge break in Python, with one quick look a couple of weeks ago, I am back into Python
Dunno why I stop. I really love it lol.
In order to refresh properly, I decided to go through a beginners learning program quickly, and I chose Learn Python the Hard Way. http://learnpythonthehardway.org/
Although I am progressing quite quickly, I was in for a happy surprise when it goes into a few things that I didn't learn from where I am up to in the MIT (not really that far lol.)
One basic syntactical new thing was the whole %s, %r %d thing. I don't even know what you call it.
It works like this:
inside a string, you can put a variable by replacing the variable with %s, %r or %d. (There may well be other letters).
This saves the awkward gaps when you attempt to put commas and variables, such as the line:
, user_name, "it is your turn."
Which I have until now been unsure in some cases how to solve (the gap problem).
The syntax of using the % is as follows:
print "Well, %s, it is your turn."
or for multiple variables in a string,
"Well, %s, it is now the turn of %s."
% (variable1, variable2)
The 3 types I have described are %s, %r and %d.
%s is for strings, in which quotes will not surround.
%r is for any type, and quotes will surround, and
%d is for integers.
2 blog comments below
This is called "string formatting" and allows to convert any type of data ( on the right ) to a string representation ( on the left ). See for example many ways how to represent a floating point value as a string:
>>> "%d" % 3.14
>>> "%f" % 3.14
>>> "%.3f" % 3.14
>>> "%e" % 3.14
>>> "%s" % 3.14
You can add parameter ( like shown in case of %f ) to be more specific with how to format the string; here: %.3f would mean to provide a three-digits formatting of 3.14.
%r stands for the Python internal representation of a variable. With 3.14 you get something interesting:
>>> "%r" % 3.14
Best Regards ... Axel