In R, it is possible to perform two-sample one-tailed t-test simply by using In Python world, scipy provides similar function ttest_ind, but which can only do two-tailed t-tests. Closest information on the topic I found is this link, but it seems to be rather a discussion of the policy of implementing one-tai…
Tag: python
How to make Polygon in SymPy from a list of vertices
I want to use SymPy to create a Polygon with n faces and calculate all parameters. The easy form is but I want to use n points from a list, for example But this form and similar is not validated. Any suggestions? Answer You could do this by putting an asterisk in front of the list of parameters to expand
Averaging over every n elements of a numpy array
I have a numpy array. I want to create a new array which is the average over every consecutive triplet of elements. So the new array will be a third of the size as the original. As an example: should return the array: Can anyone suggest an efficient way of doing this? I’m drawing blanks. Answer If your …
dump json into yaml
I got a .json file (named it meta.json) like this: I would like to convert it to a .yaml file (named it meta.yaml) like : What I have done was : But sadly, what I got is following: Why? Answer pyyaml.dump() has an allow_unicode option that defaults to None (all non-ASCII characters in the output are escaped).…
Random row selection in Pandas dataframe
Is there a way to select random rows from a DataFrame in Pandas. In R, using the car package, there is a useful function some(x, n) which is similar to head but selects, in this example, 10 rows at random from x. I have also looked at the slicing documentation and there seems to be nothing equivalent. Update …
How to match a whole word with a regular expression?
I’m having trouble finding the correct regular expression for the scenario below: Lets say: I want to match whole word – for example match “hi” should return False since “hi” is not a word and “is” should return True since there is no alpha character on the left…
How to build URLs in Python with the standard library? [closed]
Closed. This question does not meet Stack Overflow guidelines. It is not currently accepting answers. We don’t allow questions seeking recommendations for books, tools, software libraries, and more. You can edit the question so it can be answered with facts and citations. Closed 5 years ago. This post was edi…
Variable name gives Syntax error (Python)
I am having a problem with a simple program I made. For some reason the line num2 += num1 gives me a syntax error on num2. Answer You missed one ), closing parenthesis, here: should be
How to print a dictionary line by line in Python?
This is the dictionary Using this for loop It prints the following: But I want the program to print it like this: I just started learning dictionaries so I’m not sure how to do this. Answer output:
How can I pass a list as a command-line argument with argparse?
I am trying to pass a list as an argument to a command line program. Is there an argparse option to pass a list as option? Script is called like below Answer SHORT ANSWER Use the nargs option or the ‘append’ setting of the action option (depending on how you want the user interface to behave). nar…