Dear Alan Gauld, Pure by coïncedent I found your answer to me on the internet at http://code.activestate.com/lists/python-tutor/109848/ There was no answer on my e-mail account. Your answer works ! Thanks for that !
Regards, Wim Berrelkamp Groningen, The Netherlands On 12/04/17 13:47, Wim Berrelkamp wrote: >>>> a=2 Here you assign the number 2 to 'a' >>>> d=a+4>>>> print(d)> 6> a=input('-->' ) Here you assign whatever character(s) the user types to 'a'. The fact that it looks like 2 doesn't change the fact that it is really the character '2'. So you need to convert it to a number using either int() or float() a = int(input('-->')) or a = float(input('-->')) > print(a)> d=a+4> print(d)> > I tried to use float(), but nothing works.> What am I doing wrong ? I don't know, because you don't show us how you tried to use float(), but if you apply it as shown above it should work. -- Alan G Author of the Learn to Program web site http://www.alan-g.me.uk/ http://www.amazon.com/author/alan_gauld Follow my photo-blog on Flickr at: http://www.flickr.com/photos/alangauldphotos ---------- Forwarded message ---------- From: Wim Berrelkamp <wimberrelk...@gmail.com> Date: 2017-04-12 14:47 GMT+02:00 Subject: Startup Python To: tutor@python.org Dear Tutor, In earlier days I programmed a lot with Quick Basic in DOS. Now I retiered, I hoped to have Python as a platform. So I installed it and saw a lot of simmularity with Basic. I hope you can help me with the following, which should not be difficult, but I cannot find the solution. When I type this: >>> a=2 >>> d=a+4 >>> print(d) 6 I got the correct answer. When I try this to run it in a Module: a=input('-->' ) print(a) d=a+4 print(d) I get this as a result: input test.py -->2 2 Traceback (most recent call last): File "C:\Users\Gebruiker\AppData\Local\Programs\Python\Python36\Lib\idlelib\input test.py", line 3, in <module> d=a+4 TypeError: must be str, not int >>> I receive this message. I tried to use float(), but nothing works. What am I doing wrong ? Thanks in advance ! Regards, Wim Berrelkamp Groningen, The Netherlands _______________________________________________ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor