I have a database that I want to back up with my a python code. I tried to base my code from the code in this discussion that uses the subprocess module and pg_dump. My problem now is that I have to manually type in the password to get the backup file. I read somewhere that doing a .pgpass but
Tag: python-3.x
Create iterator to return elements from each iterable one by one
I was learning the itertools module and I am trying to make an iterator to return each element from the iterables provided as input. with one more rider that if say the lists are not of the same length then next(it) should return elements from the longer list when the shorter one runs out. Attempt at solution Which kind of
Check if all values in dataframe column are the same
I want to do a quick and easy check if all column values for counts are the same in a dataframe: In: Out: I want just a simple condition that if all counts = same value then print(‘True’). Is there a fast way to do this? Answer An efficient way to do this is by comparing the first value with
Getting indices of ascending order of list
I know that this question has been asked a hundred times, but the answer always seems to be “use numpy’s argsort”. But either I am misinterpreting what most people are asking, or the answers are not correct for the question. Whatever be the case, I wish to get indices of a list’s ascending order. The phrasing is confusing, so as
Python Challenge level 3 – Solving with string slicing
apologies to posting the question, as has been answered in other questions as well. However, couldn’t figure out what’s wrong with this solution. The question requires to find the lower-cased characters bordered by 3 upper-cased characters on each side. The code i’ve writting: The string i’m getting is ‘lgvcaaginbkvsoezhtlnldslyitlooqfgiksudtm’ vs ‘linkedlist’ Thanks for the help. Edit: for some reason the
How does one show x10(superscript number) instead of 1e(number) for axes in matplotlib?
The only way I know how to use scientific notation for the end of the axes in matplotlib is with plt.ticklabel_format(style=’sci’, axis=’y’, scilimits=(0,0)) but this will use 1e instead of x10. In the example code below it shows 1e6, but I want x10 to the power of 6, x10superscript6 (x10^6 with the 6 small and no ^). Is there a
How to delete the 0’s before the number if the number does not require them?
I’m making a program that prints all possible mixtures of numbers from 0 to 9 and I want to delete the numbers that my code puts before the actual number if the output is less than 6 places. I’ve tried putting “” before 0 in every array, but it also puts random spaces in the output. So I want it
NumPy Error: The truth value of an array with more than one element is ambiguous. Use a.any() or a.all()
I am working on an Image Convolution code using numpy: I get the below error: on line while i < imax and delta_new > epsilon**2 * delta_0: Could anyone please tell me what am I doing wrong ? Answer It looks like delta_new and delta_0 are Numpy arrays, and Numpy doesn’t know how to compare them. As an example, imagine
Web scraping: Index out of Bound (Possible scaling error)
Hi Wrote a web scraping program and it gets the ASN number correctly, but after all the data is scraped, it returns a error “Array Out if Bounds”. I am using Pycharm and latest python version. Below is my code. There is already a similar issue on stackoverflow but I am not able to get the pieces together and make
Starred expression in ternary operator python
I wrote a python program to print the ascii value of up to every 3 numbers in a string or “ERROR” if the length is not divisible by three. I was golf the code when I ran into a SyntaxError. Code: But this works: Putting a space before the * or after the 3 doesn’t work. I could just use