using .format

[s...@weacceptyou.com]

hey,

i understand using .format i can substitute in a value into the middle of string

eg.

word = 'cat'
print 'the {} sat on the mat'.format(word)

but what if you want to substitute in a string into a line which has other operations at the end. Like this example

cmds.getAttr(curves['curve{}'].spans*2+1

here i am accessing a curve from a dictionary and finding its span value and then multiplying by 2 + 1.

So where in this line can i put the .format(value) ?. I cant put it right at the end or put it right after the string in between the string and the ].

can someone help me understand how i can do this. Using the concatenation + doesnt work either because is just returns:

unsupported operand type(s) for +: 'NoneType' and 'str'

any help on this would be nice,
thanks,
Sam

[Justin Israel]

It always goes after the string, no matter what. It is a method of a string

cmds.getAttr(curves['curve{}'.format('xyz')].spans*2+1

But you can avoid hard to read lines and break it apart

curve = curves['curve{}'.format('xyz')]
spans = cmds.getAttr('{}.spans'.format(curve))
spans = spans * 2 + 1

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[s...@weacceptyou.com]

thanks alot Justin

Sam

[s...@weacceptyou.com]

one last thing,

i am currently splitting things up like you showed which works. But is there actually a way to fit this all on one line if there are two string chunks seperated?.

the problem is after the 'curve{}' there needs to be the other square brace ] then followed by the second string'.spans'

cmds.getAttr(curves['curve{}'.format('xyz')].spans)*2+1

should i just use a + inbetween ] and '.spans'

thanks,
Sam

[Justin Israel]

There is usually a way to do it all on one line, if that is your goal and you find it readable:

cmds.getAttr("{}.spans".format(curves['curve{}'.format('xyz')]))*2+1

Do you find this readable?

Justin

 

thanks,
Sam

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[Geordie Martinez]

Hey Sam,
attached is a cheat sheet I made for string formatting with .format() for my workshop. it might help you with your questions.

also

I do have a whole section on string formatting in my python workshop that I’m starting again at the end of June.
if you’re interested take a look:

http://www.cgcircuit.com/workshops/1

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[s...@weacceptyou.com]

thanks this is very handy

cheers,
Sam