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Python Magic Methods Repr

06/06/19

Difference between str and repr?

What is the difference between `__str__` and `__repr__` in `Python`?

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Python Macos Pip Install

06/06/19

How do I install pip on macOS or OS X?

I spent most of the day yesterday searching for a clear answer for installing `pip` (package manager for Python). I can't find a good solution.How do I install it?

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Python Iteration

06/06/19

How to remove items from a list while iterating?

I'm iterating over a list of tuples in Python, and am attempting to remove them if they meet certain criteria. for tup in somelist: if determine(tup): code_to_remove_tupWhat... more

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Python Udp Simulink Decode

06/05/19

Decoding Simulink's UDP Packets in Python?

I have a Simulink model sending data via UDP to another program (Blender) where I can receive the packets, but I have not been able to figure out how to correctly decode them. In the Simulink... more

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Python Matlab Simulink

06/03/19

Create a python script to simulate a Matlab file and store results?

I have recently started working as a student assistant and I have to write a script in Pycharm (python) which is something new for me. My task is to write a python script which takes a Matlab file... more

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Python Language Design Least Astonishment

06/03/19

Least Astonishment and the Mutable Default Argument?

Anyone tinkering with Python long enough has been bitten (or torn to pieces) by the following issue: def foo(a=[]): a.append(5) return aPython novices would expect this function to... more

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Python Dictionary

06/01/19

Should I use 'has_key()' or 'in' on Python dicts?

I wonder what is better to do: d = {'a': 1, 'b': 2} 'a' in d Trueor: d = {'a': 1, 'b': 2} d.has_key('a') True

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Python Accounting Finance Financial

05/29/19

Get delta values of each quarter from cumulated income statement reports with pandas?

Get value of each quarter from cumulated income statement reports with pandas Is there any way to do it with python/pandas? I have an example dataset like below. (please suppose that this... more

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Python Geometry

05/29/19

Good geometry library in python?

I am looking for a good and well developed library for geometrical manipulations and evaluations in python, like: - evaluate the intersection between two lines in 2D and 3D (if present) -... more

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Python Geometry Coordinates Algorithm

05/29/19

How do I check if cartesian coordinates make up a rectangle efficiently?

The situation is as follows: - There are N arrays. - In each array (0..N-1) there are (x,y) tuples (cartesian coordinates) stored - The length of each array can be different I want to extract the... more

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Python Geometry Points Algorithm

05/29/19

Find equidistant points between two coordinates?

I have a function which needs to take out equidistant points between two points on the screen(2d). Like this - |--------------| The distance is already decided. For example, I take it as `2`... more

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Python Geometry

05/29/19

Estimating aspect ratio of a convex hull?

What would be the best way to approximate the aspect ratio of a convex hull in Python? I have already tried doing this by fitting the vertices of the convex hull with an ellipse and taking the... more

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Python Geometry Graph Cycle

05/29/19

Finding cycle of 3 nodes ( or triangles) in a graph?

I am working with complex networks. I want to find group of nodes which forms a cycle of 3 nodes (or triangles) in a given graph. As my graph contains about million edges, using a simple iterative... more

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Python Geometry Intersection Points

05/29/19

Finding all points common to two circles?

In Python, how would one find all integer points common to two circles? For example, imagine a Venn diagram-like intersection of two (equally sized) circles, with center-points `(x1,y1)` and... more

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Python Math Geometry

05/29/19

How can you determine a point is between two other points on a line segment?

Let's say you have a two dimensional plane with 2 points (called a and b) on it represented by an x integer and a y integer for each point. How can you determine if another point c is on the line... more

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Python Math Calculus

05/29/19

How can I get more exact decimal values in Python?

from math import sqrt a=1e-8 b=10 c=1e-8 x1 = ((-b)-sqrt((b**2)-(4*a*c)))/(2*a) x2 = ((-b)+sqrt((b**2)-(4*a*c)))/(2*a) print 'x1 = {}'.format(x1) print 'x2 = {}'.format(x2) ... more

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Python Sql Django Postgresql

05/29/19

django test app error - Got an error creating the test database: permission denied to create database?

When I try to test any app with command (I noticed it when I tried to deploy myproject using fabric, which uses this command): python manage.py test appname I get this error: Creating test... more

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Python Pandas Replace Dataframe

05/29/19

Renaming columns in pandas?

I have a DataFrame using pandas and column labels that I need to edit to replace the original column labels. I'd like to change the column names in a DataFrame `A` where the original column names... more

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Python File Io

05/29/19

Correct way to write line to file?

I'm used to doing `print >>f, "hi there"`However, it seems that `print >>` is getting deprecated. What is the recommended way to do the line above?Update:Regarding all those answers... more

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Python Linux Mysql Python Ssh

05/28/19

mysql_config not found when installing mysqldb python interface?

I am trying to get a Python script to run on the linux server I'm connected to via ssh. The script uses mysqldb. I have all the other components I need, but when I try to install mySQLdb via... more

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Python Integer String Formatting

05/28/19

Display number with leading zeros?

Given: a = 1 b = 10 c = 100How do I display a leading zero for all numbers with less than two digits?That is, 01 10 100

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Python Text Files Line Count

05/28/19

How to get line count cheaply in Python?

I need to get a line count of a large file (hundreds of thousands of lines) in python. What is the most efficient way both memory- and time-wise?At the moment I do: def file_len(fname): ... more

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Python Integer Parsing Type Conversion

05/28/19

How do I parse a string to a float or int in Python?

In Python, how can I parse a numeric string like `"545.2222"` to its corresponding float value, `545.2222`? Or parse the string `"31"` to an integer, `31`?I just want to know how to parse a *float*... more

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Python List Data Structures Sorting

05/27/19

How do I sort a list of dictionaries by a value of the dictionary?

I have a list of dictionaries and want each item to be sorted by a specific property values.Take into consideration the array below, [{'name':'Homer', 'age':39}, {'name':'Bart', 'age':10}]When... more

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Python Kwargs Args

05/25/19

Use of *args and **kwargs?

So I have difficulty with the concept of `*args` and `**kwargs`.So far I have learned that: * `*args` = list of arguments - as positional arguments * `**kwargs` = dictionary - whose keys become... more

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Difference between __str__ and __repr__?

How do I install pip on macOS or OS X?

How to remove items from a list while iterating?

Decoding Simulink's UDP Packets in Python?

Create a python script to simulate a Matlab file and store results?

Least Astonishment and the Mutable Default Argument?

Should I use 'has_key()' or 'in' on Python dicts?

Get delta values of each quarter from cumulated income statement reports with pandas?

Good geometry library in python?

How do I check if cartesian coordinates make up a rectangle efficiently?

Find equidistant points between two coordinates?

Estimating aspect ratio of a convex hull?

Finding cycle of 3 nodes ( or triangles) in a graph?

Finding all points common to two circles?

How can you determine a point is between two other points on a line segment?

How can I get more exact decimal values in Python?

django test app error - Got an error creating the test database: permission denied to create database?

Renaming columns in pandas?

Correct way to write line to file?

mysql_config not found when installing mysqldb python interface?

Display number with leading zeros?

How to get line count cheaply in Python?

How do I parse a string to a float or int in Python?

How do I sort a list of dictionaries by a value of the dictionary?

Use of *args and **kwargs?

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Difference between str and repr?