Trying to understand this code...

[some_evil]

Hi All,

I have recently been setting up a Thermometer with my Pi, and I have noticed a line of code in a tutorial which I am using, but I am unsure what it is doing exactly, so I am hoping to research and have it clearer in my mind...

The line is:

Code: Select all

print 'Temp={0:0.1f}*C  Humidity={1:0.1f}%'.format(t,h)

I am used to doing this type of thing:

Code: Select all

print 'Hi, My name is %s and my age is %s years' % (name,age)

but this stuff with the curly brackets and .format has me stumped.

Can anyone please either explain what the code is doing in my first example? Or give me something I can google to research myself?

Thanks very much for your time.

[Douglas6]

Format is the preferred method of doing the same thing. One, it requires more typing, and so promotes stoicism and finger strength. Two, it is more flexible, and is described fully here: https://docs.python.org/2/library/strin ... ing-syntax

[some_evil]

Excellent, so after a quick read, I think I can pull it apart...

{0:0.1f}

the first zero is referencing the first argument (in this case it is 't')

the 0.1f is telling it that the t should be displayed to 1 decimal place. E.g. 26.5*C

is it as simple as that?

[Douglas6]

Just that easy. The arguments can have names instead of indices, but frankly I've never seen it done. You can also skip the index {:0.1f} and assume a sequence.