@osman-haider Please take a look at the merge requests

The issue arises because you may have redefined or implemented your own version of the join function that does not behave as expected. The Python built-in str.join method works correctly, and you should ensure it is used instead of any custom implementation.

Here’s how you can fix the issue:

Check for redefinition of join: Ensure that the name join hasn’t been overridden in your code or by a module.

Solution code snippet:

s = ["", "", ""]
result = ",".join(s)
print(result) # Outputs: ',,'
If you need a custom implementation of join: Ensure it mimics the behavior of str.join. Here’s an example:

def join(separator, iterable):
return separator.join(iterable)

s = ["", "", ""]
print(join(",", s)) # Outputs: ',,'
Explanation of Built-in Behavior
The built-in str.join works by concatenating the strings in the iterable with the separator. An empty string "" is still a valid string, so ",".join(["", "", ""]) produces ",,".

If join is not behaving as expected:

Check if join has been redefined by adding a print statement: print(join).
Avoid using the name join for any variable or function that isn’t related to its intended use.