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How do I pipe a subprocess call to a text file?
...utput = p2.communicate()[0]
There's plenty of lovely, useful info on the python manual page.
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How do you rotate a two dimensional array?
...tipping” the matrix onto its right side. We want to write a function, in Python, that takes a matrix and rotates in once to the right. The function signature will be:
def rotate(matrix):
# Algorithm goes here.
The matrix will be defined using a two-dimensional array:
matrix = [
[0,1],
...
Calculate distance between two latitude-longitude points? (Haversine formula)
...h my jsPerf and see the results here.
Recently I needed to do the same in python, so here is a python implementation:
from math import cos, asin, sqrt, pi
def distance(lat1, lon1, lat2, lon2):
p = pi/180
a = 0.5 - cos((lat2-lat1)*p)/2 + cos(lat1*p) * cos(lat2*p) * (1-cos((lon2-lon1)*p))/2...
How do you sort a list in Jinja2?
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Ok, thanks. I did end up sorting in Python before sending to template: <code>movie_list = sorted( movie_list, key = lambda movie:movie.rating, reverse = True )</code> Too bad, it might be nice to let the template decide on the sort order! ( could ...
Selenium wait until document is ready
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Here's my attempt at a completely generic solution, in Python:
First, a generic "wait" function (use a WebDriverWait if you like, I find them ugly):
def wait_for(condition_function):
start_time = time.time()
while time.time() < start_time + 3:
if condition_fu...
Expression Versus Statement
...ction can iclude unless the language only allows for limited lambdas, like Python's single-expression lambdas.
In an expression-based language, all you need is a single expression for a function since all control structures return a value (a lot of them return NIL). There's no need for a return st...
One-line list comprehension: if-else variants
It's more about python list comprehension syntax. I've got a list comprehension that produces list of odd numbers of a given range:
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How much faster is Redis than mongoDB?
... the following benchmark: 2x write, 3x read.
Here's a simple benchmark in python you can adapt to your purposes, I was looking at how well each would perform simply setting/retrieving values:
#!/usr/bin/env python2.7
import sys, time
from pymongo import Connection
import redis
# connect to redis ...
How to convert a NumPy array to PIL image applying matplotlib colormap
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Not the answer you're looking for? Browse other questions tagged python numpy matplotlib python-imaging-library color-mapping or ask your own question.
How to select rows from a DataFrame based on column values?
...>= A) & (df['column_name'] <= B)]
Note the parentheses. Due to Python's operator precedence rules, & binds more tightly than <= and >=. Thus, the parentheses in the last example are necessary. Without the parentheses
df['column_name'] >= A & df['column_name'] <= B
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