大约有 5,500 项符合查询结果（耗时：0.0201秒） [XML]
Extract subset of key-value pairs from Python dictionary object?
...3.1-5)] on linux2
import numpy.random as nprnd
...: keys = nprnd.randint(100000, size=10000)
...: bigdict = dict([(_, nprnd.rand()) for _ in range(100000)])
...:
...: %timeit {key:bigdict[key] for key in keys}
...: %timeit dict((key, bigdict[key]) for key in keys)
...: %timeit dict(map(...
How to read a line from the console in C?
...t read. So you use fgetc:
char * getline(void) {
char * line = malloc(100), * linep = line;
size_t lenmax = 100, len = lenmax;
int c;
if(line == NULL)
return NULL;
for(;;) {
c = fgetc(stdin);
if(c == EOF)
break;
if(--len == 0) {
...
pandas DataFrame: replace nan values with average of columns
...ion from the test set into the training set! Imagine it like this: We have 100 data rows and we consider column x. The first 99 entries of x are NA. We want to split off row 100 as a test set. Let's assume row 100 has value 20 in column x. Then you will replace all entries in the training set in col...
Find a string by searching all tables in SQL Server Management Studio 2008
... to narrow the search scope
USE DATABASE_NAME
DECLARE @SearchStr nvarchar(100) = 'SEARCH_TEXT'
DECLARE @Results TABLE (ColumnName nvarchar(370), ColumnValue nvarchar(3630))
SET NOCOUNT ON
DECLARE @TableName nvarchar(256), @ColumnName nvarchar(128), @SearchStr2 nvarchar(110)
SET @TableName = ''
S...
How to customize user profile when using django-allauth
... what worked for me combining a few of the other answers (none of them are 100% complete and DRY).
In yourapp/forms.py:
from django.contrib.auth import get_user_model
from django import forms
class SignupForm(forms.ModelForm):
class Meta:
model = get_user_model()
fields = ['fi...
What are the use cases for selecting CHAR over VARCHAR in SQL?
...er set) storing the word "FooBar"
CHAR(6) = 6 bytes (no overhead)
VARCHAR(100) = 8 bytes (2 bytes of overhead)
CHAR(10) = 10 bytes (4 bytes of waste)
The bottom line is CHAR can be faster and more space-efficient for data of relatively the same length (within two characters length difference).
Not...
Changing the interval of SetInterval while it's running
...i'); }, 10, 10);
setDeceleratingTimeout(function(){ console.log('bye'); }, 100, 10);
share
|
improve this answer
|
follow
|
...
How to present popover properly in iOS 8
...elf
popover.sourceView = self.view
popover.sourceRect = CGRectMake(100,100,0,0)
self.presentViewController(nav, animated: true, completion: nil)
}
That's the way.
You don't talk to the popover itself anymore, you talk to the view controller inside of it to set the content size, by ...
How to get disk capacity and free space of remote computer
... in powershell why does 1mb return a value of 1048576 and not 1000000 ????
– oldboy
Jan 1 at 4:56
...
Export query result to .csv file in SQL Server 2008
... add two lines at the top of the script: Add-PSSnapin SqlServerCmdletSnapin100 and Add-PSSnapin SqlServerProviderSnapin100.
– Eric J.
Dec 7 '14 at 22:28
...