json.dumps() converts a dictionary to str object, not a json(dict) object! So you have to load your str into a dict to use it by using json.loads() method See json.dumps() as a save method and json.loads() as a retrieve method. This is the code sample which might help you understand it more:
No there is not. You cannot declare a variable or value as constant in Python. Just don’t change it. If you are in a class, the equivalent would be: if not, it is just But you might want to have a look at the code snippet Constants in Python by Alex Martelli. As of Python … Read more
PriceList[0] is a float. PriceList[0][1] is trying to access the first element of a float. Instead, do or
While the indentation errors are obvious in the StackOverflow page, they may not be in your editor. You have a mix of different indentation types here, 1, 4 and 8 spaces. You should always use four spaces for indentation, as per PEP8. You should also avoid mixing tabs and spaces. I also recommend that you … Read more
It is a guard against a stack overflow, yes. Python (or rather, the CPython implementation) doesn’t optimize tail recursion, and unbridled recursion causes stack overflows. You can check the recursion limit with sys.getrecursionlimit: and change the recursion limit with sys.setrecursionlimit: but doing so is dangerous — the standard limit is a little conservative, but Python … Read more
I think your code is trying to “divide by zero” or “divide by NaN”. If you are aware of that and don’t want it to bother you, then you can try: For more details see: http://docs.scipy.org/doc/numpy/reference/generated/numpy.seterr.html
What is the best way to copy text to the clipboard (multi-browser)? I have tried: But in Internet Explorer it gives a syntax error. In Firefox, it says unsafeWindow is not defined. A nice trick without using Flash: How does Trello access the user’s clipboard?
os.rename(), os.replace(), or shutil.move() All employ the same syntax: Note that you must include the file name (file.foo) in both the source and destination arguments. If it is changed, the file will be renamed as well as moved. Note also that in the first two cases the directory in which the new file is being … Read more
As written you’re looking for a file named 0.jpg in the working directory. You want to be looking in the directory you pass in. So instead do:
Yes, if bar is not None is more explicit, and thus better, assuming it is indeed what you want. That’s not always the case, there are subtle differences: if not bar: will execute if bar is any kind of zero or empty container, or False. Many people do use not bar where they really do … Read more