I am trying to install Python for the first time. I downloaded the following installer from the Python website: Python 2.7.1 Windows Installer (Windows binary — does not include source). I then ran the installer, selected ‘All Users’ and all was fine. I installed Python into the default location: Next, to test that Python was … Read more
Clearly you’re passing in d.keys() to your shuffle function. Probably this was written with python2.x (when d.keys() returned a list). With python3.x, d.keys() returns a dict_keys object which behaves a lot more like a set than a list. As such, it can’t be indexed. The solution is to pass list(d.keys()) (or simply list(d)) to shuffle.
I am making a stopwatch type program in Python and I would like to know how to detect if a key is pressed (such as p for pause and s for stop), and I would not like it to be something like raw_input, which waits for the user’s input before continuing execution. Anyone know how … Read more
You are using str methods on an open file object. You can read the file as a list of lines by simply calling list() on the file object: This does include the newline characters. You can strip those in a list comprehension:
I have an error message on Django 1.4: It happened when I tried using a template tag like: {% for v in values %}: It happens too when I try to access on a hstore queryset: The code is: I’m just trying to access the value. I don’t understand the “update sequence” message. When I … Read more
In Python 3, add the following to the end of your code: This will cause the program to wait for user input, with pressing ENTER causing the program to finish. You can double click on your script.py file in Windows conveniently this way.
len is a function to get the length of a collection. It works by calling an object’s __len__ method. __something__ attributes are special and usually more than meets the eye, and generally should not be called directly. It was decided at some point long ago getting the length of something should be a function and not a method code, reasoning … Read more
Use weekday(): From the documentation: Return the day of the week as an integer, where Monday is 0 and Sunday is 6.
There is no such function; the easiest way to do this is to use a dict comprehension: In python 2.7, use the .iteritems() method instead of .items() to save memory. The dict comprehension syntax wasn’t introduced until python 2.7. Note that there is no such method on lists either; you’d have to use a list comprehension or the map() function. As … Read more
When you assign a variable (x = …), you are creating a variable in the current scope (e.g. local to the current function). If it happens to shadow a variable fron an outer (e.g. global) scope, well too bad – Python doesn’t care (and that’s a good thing). So you can’t do this: and expect 1. … Read more