[Tutor] need help reading the code

[Alan Gauld]

On 07/07/14 19:29, keith papa wrote:
# decimal (.) precision of 3 for float '0.333'

 >>> print '{0:.3f}'.format(1.0/3)

The best way to see how this works is to try it
with different values:

 >>> print('{0:.3f}'.format(1.0/3))
0.333
 >>> print('{0:.5f}'.format(1.0/3))
0.33333
 >>> print('{0:.1f}'.format(1.0/3))
0.3
 >>> print('{0:.5f}'.format(1.0/2))
0.50000
 >>>

Look at how many digits appear after the decimal
point in each case.


# fill with underscores (_) with the text centered
# (^) to 11 width '___hello___'

 >>> print '{0:_^11}'.format('hello')

Again, try it out with different values.
The tricky thing here is that he is showing 3 different features in one 
example.
Try breaking them down into 3 different sets then
building them back up:

set width of field:

 >>> print('{:11}'.format('hello'))
hello
 >>> print('{:3}'.format('hello'))
hello
 >>>

Hmmm, Doesn't seem to do anything...Lets add some justification

 >>> print('{:<11}'.format('hello'))
hello
 >>> print('{:>11}'.format('hello'))
       hello
 >>> print('{:^11}'.format('hello'))
    hello

Somethings happening, but to really see what it is...

add a padding character so you see the 'spaces;:

 >>> print('{:_>11}'.format('hello'))
______hello
 >>> print('{:_<11}'.format('hello'))
hello______
 >>> print('{:_^11}'.format('hello'))
___hello___

Which is where we came in...

Try different padding characters and change the width values.

HTH
-- 
Alan G
Author of the Learn to Program web site
http://www.alan-g.me.uk/
http://www.flickr.com/photos/alangauldphotos