Assuming a is a string. The Slice notation in python has the syntax – So, when you do a[::-1], it starts from the end towards the first taking each element. So it reverses a. This is applicable for lists/tuples as well. Example – Then you convert it to int and then back to string (Though … Read more
You mustn’t use quotation marks around the name of the image files in markdown! If you carefully read your error message, you will see the two %22 parts in the link. That is the html encoded quotation mark. You have to change the line to UPDATE It is assumed, that you have the following file … Read more
UPDATE: This is no longer necessary with Python3.4. It installs pip3 as part of the stock install. I ended up posting this same question on the python mailing list, and got the following answer: Which solved my question perfectly. After adding the following for my own: So that I could run pip directly, I was … Read more
In Python 3, range returns a lazy sequence object – it does not return a list. There is no way to rearrange elements in a range object, so it cannot be shuffled. Convert it to a list before shuffling.
You can use the os module. But if it’s about finding other modules: You can set an environment variable called PYTHONPATH, under Linux would be like Then, the interpreter searches also at this place for imported modules. I guess the name would be the same under Windows, but don’t know how to change. edit Under … Read more
Every canvas item is an object that Tkinter keeps track of. If you are clearing the screen by just drawing a black rectangle, then you effectively have created a memory leak — eventually your program will crash due to the millions of items that have been drawn. To clear a canvas, use the delete method. … Read more
It has no special meaning. It just inserts a $ character: Sometimes a dollar is just a dollar. You also linked to the wrong documentation; the formatting syntax documented there only applies to the format() function and the str.format() method. You want to look at the printf-style String Formatting section instead.
You misunderstand the error message: It doesn’t say that a list would not be iterable, it says that a method isn’t. What happens is that your pieces list doesn’t contain pieces but references to the add_piece method because you forgot to call the method when you wanted to append its result in line 56. You could have found this … Read more
I just downloaded Python and Visual Studio. I’m trying to test the debugging feature for a simple “Hello World” script and I’m receiving this error: Failed to launch the Python Process, please validate the path ‘python’ followed by this in the debug console: Error: spawn python ENOENT Could someone please help me out and tell … Read more
If all you care about are digits, you can use the str.maketrans() and str.translate() methods: Which will output: Note that this won’t work in Python 2 – see Python 2 maketrans() function doesn’t work with Unicode for an explanation of why that’s the case, and how to work around it.