On 13 March 2013 21:12, Abhishek Pratap <[email protected]> wrote: > On Wed, Mar 13, 2013 at 2:02 PM, Oscar Benjamin > <[email protected]> wrote: >> On 13 March 2013 19:50, Abhishek Pratap <[email protected]> wrote: >>> Hey Guys >>> >>> I might be missing something obvious here. >>> >>> >>> import numpy as np >>> >>> count = 0 >>> [ count += 1 for num in np.random.random_integers(1,100,20) if num > 20] >>> >>> File "<ipython-input-45-0ba0e51b7644>", line 2 >>> [ count += 1 for num in np.random.random_integers(1,100,20) if num > 20] >>> ^ >>> SyntaxError: invalid syntax [SNIP] > > I just used a very contrived example to ask if we can increment a > counter inside a generator. The real case is more specific and > dependent on other code and not necessarily useful for the question.
Ok, so can you be more specific about the effect that you are trying to achieve? Do you want to know the length of the list (equivalent to Dave's suggestion)? len([num for num in np.random.random_integers(1,100,20) if num > 20]) Or is it that you want to use count in the expression in the list comprehension (it's not actually a generator by the way)? You can achieve this with enumerate and an inner generator: data = np.random.random_integers(1, 100, 20) [x + count for count, x in enumerate(n for n in data if n > 2)] If your case is much more complicated than this then personally I would write a generator function rather than use a comprehension. Then you can increment variables or anything else just like normal. Oscar _______________________________________________ Tutor maillist - [email protected] To unsubscribe or change subscription options: http://mail.python.org/mailman/listinfo/tutor
