CODEWITHSUNDEEP
python-3.x
apil.tamang
apil.tamang

Reputation: 2725

python print iteratively from two lists

Let's cut to the chase:

I want to write an iterative print statement, so that given

names = ["val_loss","accuracy","f2_loss"] 
values= [0.2454431134, 0.832532234, 0.982762611]

the script should print so that numbers are round off to 6 decimal places, and the list is dynamically iterated on.

Example:

val_loss: 0.245443, accuracy: 0.832532, f2_loss: 0.982762

The kind of iterator I want is something like:

strr = [names[i],":",values[i] for i in range(len(metrics)]

but of course the above doesn't work because I'm not a python wiz. and cannot always write a non-trivial list iterator.

Thanks for your help.

Upvotes: 1

Views: 80

Answers (2)

Alex Huszagh
Alex Huszagh

Reputation: 14644

You could use zip and fancy formatting ;)

strs = []
for (name, value) in zip(names, values):    
    strs.append("{}:{:.6f}".format(name, value))

print(', '.join(strs))

Or, as a fancy 1-liner...

print(', '.join(("{}:{:.6f}".format(n, v) for (n, v) in zip(names, values))))

Explanation

In Python2, use itertools.izip instead of zip, in Python3, use zip. Zip allows you to lazily merge N-iterables and create tuples of N-length, so zip([1, 2, 3], [4, 5, 6]) effectively becomes [(1, 4), (2, 5), (3, 6)]. zip is a great tool for any Python programmer.

As for the formatting piece, you should read the documentation. A quick explanation is f stands for floating pointer numbers, {} is a replacement group, and :.6f means a float with a max of 6 decimals.

Upvotes: 4

Atul Ojha
Atul Ojha

Reputation: 166

you could do like this:- strr = [name + ":" + str(value) + "," for name in names for value in values]

Upvotes: -2

Related Questions