How to repeat individual characters in strings in Python
What about: (changed to a list comp from a generator expression as using a list comp inside join is faster)
python
Python-3.2 coroutine: AttributeError: ‘generator’ object has no attribute ‘next’
You’re getting thrown off by the error message; type-wise, Python doesn’t make a distinction – you can .send to anything that uses yield, even if it doesn’t do anything with the sent value internally. In 3.x, there is no longer a .next method attached to these; instead, use the built-in free function next:
What is related_name used for?
The related_name attribute specifies the name of the reverse relation from the User model back to your model. If you don’t specify a related_name, Django automatically creates one using the name of your model with the suffix _set, for instance User.map_set.all(). If you do specify, e.g. related_name=maps on the User model, User.map_set will still work, but the User.maps. syntax is obviously a bit cleaner and less clunky; so for example, if you … Read more
How do I represent and work with n-bit vectors in Python?
The library BitVector is a pure-Python library for this purpose, and should suit the needs you specified.
Iterating over dictionary items(), values(), keys() in Python 3
I’m not sure if this is quite an answer to your questions but hopefully it explains a bit about the difference between Python 2 and 3 in this regard. In Python 2, iter(d.keys()) and d.iterkeys() are not quite equivalent, although they will behave the same. In the first, keys() will return a copy of the dictionary’s list of keys and iter will then … Read more
Python initializing a list of lists
The problem is that they’re all the same exact list in memory. When you use the [x]*n syntax, what you get is a list of n many x objects, but they’re all references to the same object. They’re not distinct instances, rather, just n references to the same instance. To make a list of 3 different lists, do this: This gives you 3 … Read more
How to add a background image into pygame?
For background I always make an image the size of my game window or smaller then before all of the images are displayed, I blit that image to 0,0. Hope this helps.
Styling multi-line conditions in ‘if’ statements?
You don’t need to use 4 spaces on your second conditional line. Maybe use: Also, don’t forget the whitespace is more flexible than you might think: Both of those are fairly ugly though. Maybe lose the brackets (the Style Guide discourages this though)? This at least gives you some differentiation. Or even: I think I prefer: Here’s … Read more
Does python support character type?
No. Python does not have a character or char type. All single characters are strings with length one.
“for loop” with two variables?
If you want the effect of a nested for loop, use: If you just want to loop simultaneously, use: Note that if x and y are not the same length, zip will truncate to the shortest list. As @abarnert pointed out, if you don’t want to truncate to the shortest list, you could use itertools.zip_longest. UPDATE Based on the request for “a … Read more