I don't understand join

I registered on a pay site and am working on Python I don't know what you're talking about

I don't understand the word? Search for A roundabout study of understanding and returning on other pages has begun ... I'm not frustrated why the site doesn't explain it !!! I'm grateful that they just show me what I have to do in order.

so,

originally def concat(*args, sep="/"): return sep.join(args)

Where did the join come from? ?? When I search for join

test = ['ab', 'c', 'de'] result = '' for x in test: result += x print(result) abcde

Came out. Suddenly why result = '' It came out? Why did it disappear? ?? ??

e? ?? join What is this about to cry

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