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Find column whose name contains a specific string
...'t really understand exactly how it works, though, still being new to both Python and Pandas. Could you perhaps explain?
– erikfas
Jan 22 '14 at 14:35
16
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Return multiple columns from pandas apply()
...nswer: the argument passed in to the function, also affects performance.
(Python 3.7.4, Pandas 1.0.3)
import pandas as pd
import locale
import timeit
def create_new_df_test():
df_test = pd.DataFrame([
{'dir': '/Users/uname1', 'size': 994933},
{'dir': '/Users/uname2', 'size': 1093...
What is `related_name` used for in Django?
...
Not the answer you're looking for? Browse other questions tagged python django many-to-many foreign-key-relationship or ask your own question.
How to find and return a duplicate value in array
...code for some huge scaling data (and if so, you can actually just use C or Python), the provided answer is far more elegant/readable, and isnt' going to run that much slower compared to a linear time solution. furthermore, in theory, the linear time solution requires linear space, which may not be a...
How to set target hosts in Fabric file
... roles, run, env
from fabric.tasks import execute
# Not a task, plain old Python to dynamically retrieve list of hosts
def get_stressors():
hosts = []
# logic ...
return hosts
@task
def stress_test():
# 1) Dynamically generate hosts/roles
stressors = get_stressors()
env.rol...
Regular expressions in C: examples?
...ssions in C. The Perl syntax is pretty much that same syntax used in Java, Python, and a number of other languages. The POSIX syntax is the syntax used by grep, sed, vi, etc.
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How to round up the result of integer division?
... For languages with a proper Euclidian-division operator such as Python, an even simpler approach would be pageCount = -((-records) // recordsPerPage).
– supercat
Jul 4 '18 at 16:45
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How do you performance test JavaScript code?
...;) for jsPerf. I regularly use this in a similar manner to %timeit in an ipython REPL shell for Python code.
– amcgregor
Jul 3 '19 at 16:10
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How do I do a not equal in Django queryset filtering?
...r used them but it seems they can be negated and combined much like normal python expressions.
Update: I Just tried it out, it seems to work pretty well:
>>> from myapp.models import Entry
>>> from django.db.models import Q
>>> Entry.objects.filter(~Q(id = 3))
[<Entry...
Should I return a Collection or a Stream?
...), NetworkInterface.addresses(), Scanner.tokens(), Matcher.results(), java.xml.catalog.Catalog.catalogs(). Other stream-returning methods have been added that don't use this idiom -- Scanner.findAll() comes to mind -- but the plural noun idiom seems to have come into fair use in the JDK.
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