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Questions tagged [python]
215 questions
1
vote
1 answer
A problem about slicing and indexing in numpy in Python
I learned that in numpy, given a vector, slicing and indexing could give different results. I ran the following codes:
a = np.array([1, 2])
b = np.array([3, 4, 5])
print(b[a])
c = b[1:]
print(b)
c[0] = 1
print(b)
print(c)
print(b[1:] is c)
and get…
Edward Wang
- 113
- 3
1
vote
1 answer
Truth value of a proposition
I'm trying to write a function in Python that takes it argument as a Python list and returns a boolean value based on the truth vale of the proposition $E(x) \to \exists y \text{ s.t. } x=2y$, where here the proposition $E(x)$ means 'x is…
Rishab Khincha
- 11
- 1
1
vote
1 answer
What is the practical use of list.clear() method in Python?
I was wondering if there is a reason behind clearing all the values in a list and reusing it, as opposed to deleting the list and creating a new one. Are there any practical advantages of using clear() method, aside from situations where the list is…
Akshay Katiha
- 111
- 2
1
vote
1 answer
Sympy does not recognise when two partial derivatives happen to be equal
I am trying to find the first and second-order partial derivatives of a function of four variables $S$ using pythons symbolic math package sympy.
The issue is that sympy does not automatically see that certain pairs of partial derivatives, when…
G-Shillcock
- 11
- 1
1
vote
1 answer
Why don't we recognize Python as a compiler-based language?
I just read this Why doesn't Python need a compiler?
I know that Python isn't absolutely compiler or interpreted but it is both of them it's maybe an interpretive, high-level, and all-purpose programming language. Python uses PVM(interpreter) and…
jasmine
- 19
- 6
1
vote
0 answers
Conversion of a YAML file to XLSX using Python
I want to convert a set of yaml files in a folder into an xlsx file. I thought I'd start with trying to convert one yaml file into an xlsx file. The yaml files in the folder are all in the format given below:
info:
city: Bangalore
…
Seshank K
- 11
- 1
1
vote
2 answers
parse datetime number in html field
This is a sample of datetime field:
1615717137369
It means 2 days ago (from 16 march, 13:24)
How can I parse the number?
P.S:
These are some examples:
16 15 89 8678037 16 March 16:15 ( 5 min ago)
16 15 89 8259356 16 March 16:08 (12 min…
omid jahadi
- 41
- 5
1
vote
1 answer
Meaning of this python modulo operator exercise?
I just got started with Python PCEP course material on netacad.com.
I've come across the following exercises:
2 % -4 = -2
2 % 4 = 2
As I understand it, the modulo operator returns the remainder of a division. So 2 divided by (-4) gives…
WobblyWindows
- 113
- 2
1
vote
4 answers
Quadratic equations using 2 different approaches
I am reading Mark Newman's Computational Physics and at chapter 4 page 133 in Exercise 4.2 he asks
a) Write a program that takes as input three numbers, a, b, and c, and prints out the two solutions to the quadratic equation $ax^2 + bx + c = 0$…
seVenVo1d
- 113
- 4
1
vote
1 answer
After how many iterations will an integer circle back to 0 in Python?
If this question is completely garbage I apologize because I am new to CS and haven't understood at how programming languages (Python specifically) work.
I was reading about how in a standard two-byte representation of a number, if one was to…
Fefnir Wilhelm
- 11
- 1
0
votes
1 answer
list('\a','\b','\c') prints '\x07', '\x08', '\\c'
In python3.6, I tried
In [60]: a = '\a'
In [61]: b = '\b'
In [62]: c = '\c'
In [63]: l =[a, b, c]
If test l
In [64]: l
#it output following list instead of ['a','\b','\c']
Out[64]: ['\x07', '\x08', '\\c']
encapsulate them directly in a list.
In…
Wizard
- 173
- 2
- 7
0
votes
0 answers
How do one decide topic for first data analysis project?
Suppose an absolute beginner (in the field of data analysis/data science), which is indeed my case, has decided to create a project for his/her resume.
These are the skills he has learnt:
Python(Pandas, NumPy, Seaborn/Matplotlib) - 2 years of…
Swayam Jha
- 1
- 1
0
votes
0 answers
Networks and Internet Systems
I'm currently preparing for a final exam in Networks and Internet Systems. I don't have a large background knowledge on the topics, so I'm attempting to use python to approach the majority of question in the exam. I had an original series of code…
Kate
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- 1
0
votes
0 answers
A practical issue in the code of HackerRank Restaurant problem
Problem Statement
Martha is interviewing at Subway. One of the rounds of the interview requires her to cut a bread of size $\ell \times b$ into smaller identical pieces such that each piece is a square having maximum possible side length with no…
Math-Learner
- 101
0
votes
0 answers
render = font.render(text, 1, (0, 0, 0)) pygame.error: Library not initialized
the error im receiving is : file "/home/lucas/python/cargame/utils.py", line 17, in blit_text_center
render = font.render(text, 1, (0, 0, 0))
pygame.error: Library not initialized
the problem which seems to be somewhere in this piece of code:
def…
LEJP
- 1