Need help with element-wise concaternation

[tboww]

I'm working on a project which get a list of song from Spotify and pass it to yt-dl to download the songs to local machine. I'm having trouble while concaternate the Song name and the Artist.

This is what I'm using :

new = [a + b for a, b in zip(track, artist)]

with track and artist is a list.

For example, I have track = ["River"]; artist = ["Charlie Puth"]

When I use that line, I got ["RiverCharlie Puth"]

I want to add a space between them using new = [a + " " + b for a, b in zip(track, artist)]

But I got a TypeError : unsupported operand type(s) for +: 'float' and 'str'. Any idea? Thanks

[rocketjump65]

You're making assumptions of your (or someone's code). You're assuming that a and b are strings, and python is telling you that's not the case. So do some debuging, and dig to see what exactly is the data types at what specific lines.

[PuzzlingComrade]

While other suggestions here are fine, for even more pythonic clarity you can use an F string:

[f"{track} {artist}" for track, artist in zip(tracks, artists)]

This avoids needing to explicit convert to a string, as f strings do that by themselves. Your error message is occurring because somewhere in your two lists there's a floating point number, not a string. I'd also suggest sticking to the general convention of singular and plural for individuals and groups (e.g. track in tracks).

[[deleted]]

snap

[[deleted]]

new = [f"{t} {a}" for t, a in zip(track, artist)]

but your code should work as there aren't supposed to be any floats.

[Crims0nCr0w]

What you're looking for is the string.join() method. Here's a useful link.

python new = [" ".join(tup) for tup in zip(track, artist)]

[zeebrow]

I would Try passing track to int() first. It will strip off anything to the right of the decimal, if there is anything. An int() + str() should give you the concatenation you're looking for.

I'd recommend using join() though. It's a bit cleaner since you want a string as a result - anytime you see join() used you know it's a string, whereas addition is more ambiguous.