如何在 python 中添加 for 循环 inside.join()

Question

I have found people doing something similar to this one in codewars. But for me somehow it never works. Can someone please tell me what is wrong in this code and what I should do to correct it. Thank you in advance!

PS:I know that writing a for loop outside solves this but I want my code to be neat and concise:D Edit: Thank you guys. It worked!

names = ["Alexa","Siri","Cortana"]
print(" ".join("Hello there ",(i for i in names)))

Here is the fixed code:

names = ["Alexa","Siri","Cortana"]
print("".join([f"Hello there {i}!\n" for i in names]))

Answer 1

Try this:-

names = ["Alexa","Siri","Cortana"]

print(', '.join(['Hello there ' + i for i in names]))

Output: -

'Hello there Alexa,  Hello there Siri,  Hello there Cortana'

Answer 2

You need to format the value into the string which is being joined:

names = ["Alexa","Siri","Cortana"]
print(" ".join(f"Hello there {i}" for i in names))

Output:

Hello there Alexa Hello there Siri Hello there Cortana

Answer 3

First, this is not a for loop, this is a generator expression (in your case) or list/dict/set comprehension. Second, str.join takes only one argument and you provided two - did you want your output to be: Hello there Alexa Hello there Siri Hello there Cortana or Hello there Alexa Siri Cortana ? Depending on the answer, the code could be:

print(" ".join("Hello there " + x for x in names))

or

print("Hello there " + " ".join(names))