On 12 May 2013 04:24, Ian Cordasco <graffatcolmingov@gmail.com> wrote:

Mainly because it can cause confusing TypeErrors for the functions
taking a certain number of arguments. There are a few ideas floating
around that thread, one of which is that we (the code-quality tool
authors) provide warnings or errors when someone does:

    foo('a' 'b')

i.e., uses the implicit concatenation on a single line.