strings/join.py is incorrect

[osman-haider]

Repository commit

3b1b70b

Python version (python --version)

Python 3.10

Dependencies version (pip freeze)

n/a

Expected behavior

s = ["", "", ""]
join(",", s) == ",".join(s)

',,' == ',,'

Actual behavior

s = ["", "", ""]
join(",", s) == ",".join(s)

'' != ',,'

[sanks011]

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

[niralinayak]

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.