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Python Python Collections (2016, retired 2019) Dungeon Game Line endings

Dmitri Weissman
Dmitri Weissman
4,933 Points
Posted by Dmitri Weissman
Dmitri Weissman
4,933 Points

IF order within PRINT() matters ? print (t, end = '' if t != '||' else '\n')

The attached code is not working as for some reason it prints the item anyway regardless of the matching if statement and only then evaluates the if. If i change the 

print (t, end = '' if t != '||' else '\n')

to

print ('\n' if t == '||' else t, end = '')

it will work just fine. can someone explain why it works this way ?

mapping.py 
TILES = ('-', ' ', '-', ' ', '-', '||',
         '_', '|', '_', '|', '_', '|', '||',
         '&', ' ', '_', ' ', '||',
         ' ', ' ', ' ', '^', ' ', '||'
)

for t in TILES:
    print (t, end = '' if t != '||' else '\n')

4 Answers

Steven Parker
Steven Parker
231,236 Points
Steven Parker
Steven Parker
231,236 Points

It's not the order but the functionality.

The first example always prints "t", and then ends the print different ways based on the contents of "t". The second example only prints "t" if it is not the "||" symbol.

The second example meets the challenge requirements but the first one does not.

Dmitri Weissman
Dmitri Weissman
4,933 Points
Dmitri Weissman
Dmitri Weissman
4,933 Points

oooh, got it. for some reason I was thinking that everything to the left of IF should meet the condition. so if i change the first version to

print (t if t != '||' else '\n' , end = '')

it will work.

Is there a way (with similar syntax) to have two different END arguments for print() ?

Steven Parker
Steven Parker
231,236 Points
Steven Parker
Steven Parker
231,236 Points

Sure, your first example did that, but it just produced a different result than the challenge was looking for. Here's a solution that uses the conditional expression syntax for both the content and the end:

    print (t if t != '||' else '', end = '\n' if t == '||' else '' )

For illustration only, you already have a better solution.

Dmitri Weissman
Dmitri Weissman
4,933 Points
Dmitri Weissman
Dmitri Weissman
4,933 Points

Correct me if i'm wrong, basically, each argument passed to a function should be evaluated with it's own if ?

Steven Parker
Steven Parker
231,236 Points
Steven Parker
Steven Parker
231,236 Points

That's what my example shows. But it would be very unusual to use a conditional expression on each argument of a function!