One does not get 'proficient' in a week in any given language. One can build up a program in a new language in a week, but that does not mean proficiency. It takes between many months and a few year to become proficient in a language: it is the outcome of a process of exploration, trials, mistakes, discoveries of better or more adapted ways, finding out the shortcomings an learning to work around them, picking a right balance between ease to write and ease to read, ease to write and performance...
