It looks like you’re trying to extend a list with a scalar float variable. The argument to extend must be an iterable (i.e. not a float). From your first bit of code it looks like means[i][j][k] returns a float, The problem is here, If you expect that means[i][j][k] will always be a single value and not a list you … Read more
I have managed to resolve the problem by reinstalling Python. First, I have uninstalled Python (like any other program in Windows). Then I have installed Anaconda distribution of Python. The problem is not present anymore.
You can specify the Spyder’s Run Settings in Run -> Configure (F6). By default “Execute in current Python or IPython console” is selected and you probably do not have any open console in Spyder. You can select “Execute in a new dedicated Python console” option and Spyder will automatically open a new console for you. … Read more
TL;DR input function in Python 2.7, evaluates whatever your enter, as a Python expression. If you simply want to read strings, then use raw_input function in Python 2.7, which will not evaluate the read strings. If you are using Python 3.x, raw_input has been renamed to input. Quoting the Python 3.0 release notes, raw_input() was renamed to input(). That is, the new input() function reads a … Read more
Do you understand list comprehensions? If so, a generator expression is like a list comprehension, but instead of finding all the items you’re interested and packing them into list, it waits, and yields each item out of the expression, one by one. Because a generator expression only has to yield one item at a time, … Read more
The problem isn’t your use of not, it’s that or doesn’t mean what you think it does (and if you think it through, it couldn’t): You’re asking whether the expression (“StatusRequest” or “StatusResponse”) appears in line. But that expression is just the same thing as “StatusRequest”. Put it in English: you’re not trying to say “if neither of these is in line”. Python … Read more
There are, in fact, multiple things you need to know about indentation in Python: Python really cares about indention. In other languages, indention is not necessary but only serves to improve the readability. In Python, indentation is necessary and replaces the keywords begin / end or { } of other languages. This is verified before the execution of the … Read more
Just import it or, better Just be careful to put both scripts on the same directory (or make a python package, a subdir with __init__.py file; or put the path to script.py on the PYTHONPATH; but these are “advanced options”, just put it on the same directory and it’ll be fine).
Summary The following tests are meant to give some insights into the different approaches and should be taken with a grain of salt. What is being tested here is not exactly generic filtering, but rather just applying a threshold, which has the notable feature that computing the condition is pretty fast. Very different results would … Read more
Looks like you’re a little bit confused about all that stuff. operator is a built-in module providing a set of convenient operators. In two words operator.itemgetter(n) constructs a callable that assumes an iterable object (e.g. list, tuple, set) as input, and fetches the n-th element out of it. So, you can’t use key=a[x][1] there, because python has no idea what x is. … Read more