what does the __file__ variable mean/do?

I usually just hard-wire these with the actual path. But there is a reason for these statements that determine path at runtime, and I would really like to understand the os.path module so that I can start using it.

How do I solve the following errors: “Undefined reference to WinMain”, “[Error] Id returned 1 exit status”?

This error means that the linker is looking for a function named WinMain to use as the entry point. It would be doing that because you configured the project to target the GUI subsystem, but did not provide a WinMain function. My guess is that you want to produce a console application and have provided a main function. Target the console … Read more

How to cherry-pick multiple commits

Git 1.7.2 introduced the ability to cherry pick a range of commits. From the release notes: git cherry-pick learned to pick a range of commits (e.g. cherry-pick A..B and cherry-pick –stdin), so did git revert; these do not support the nicer sequencing control rebase [-i] has, though. To cherry-pick all the commits from commit A to commit B (where A is older than B), run: If you want to ignore A itself, … Read more

‘DataFrame’ object has no attribute ‘sort’

sort() was deprecated for DataFrames in favor of either: sort_values() to sort by column(s) sort_index() to sort by the index sort() was deprecated (but still available) in Pandas with release 0.17 (2015-10-09) with the introduction of sort_values() and sort_index(). It was removed from Pandas with release 0.20 (2017-05-05).

Code for Greatest Common Divisor in Python

It’s in the standard library. Source code from the inspect module in Python 2.7: As of Python 3.5, gcd is in the math module; the one in fractions is deprecated. Moreover, inspect.getsource no longer returns explanatory source code for either method.

Using ssize_t vs int

There’s no guarantee in the POSIX standard that sizeof(int) >= sizeof(ssize_t), nor the other way around. Typically ssize_t is larger than int, but the safe and portable option in C99 is to use intmax_t instead for the argument and the return value. The only guarantees you have wrt. the relationship between int and ssize_t are: int can store values of at least the range [-2^15 … … Read more

Getting key with maximum value in dictionary?

You can use operator.itemgetter for that: And instead of building a new list in memory use stats.iteritems(). The key parameter to the max() function is a function that computes a key that is used to determine how to rank items. Please note that if you were to have another key-value pair ‘d’: 3000 that this method will only return one of the two even though they … Read more

SyntaxError: Unexpected token o in JSON at position 1

The JSON you posted looks fine, however in your code, it is most likely not a JSON string anymore, but already a JavaScript object. This means, no more parsing is necessary. You can test this yourself, e.g. in Chrome’s console: JSON.parse() converts the input into a string. The toString() method of JavaScript objects by default returns [object Object], resulting … Read more

Logistic regression – eval(family$initialize) : y values must be 0 <= y <= 1

You added the as.factor(dataCancer$Classification) in the script, but even if the dataset dataCancer is attached, a command like the one above does not transform the dataset variable Classification into a factor. It only returns a factor on the console. Since you want to fit the model on the training dataset, you either specify or use the as.factor function in the glm line code

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