大约有 40,000 项符合查询结果（耗时：0.0372秒） [XML]
How do I catch a numpy warning like it's an exception (not just for testing)?
...eems that your configuration is using the print option for numpy.seterr:
>>> import numpy as np
>>> np.array([1])/0 #'warn' mode
__main__:1: RuntimeWarning: divide by zero encountered in divide
array([0])
>>> np.seterr(all='print')
{'over': 'warn', 'divide': 'warn', 'in...
How do I convert a string to a double in Python?
...
>>> x = "2342.34"
>>> float(x)
2342.3400000000001
There you go. Use float (which behaves like and has the same precision as a C,C++, or Java double).
...
How do I parse a URL into hostname and path in javascript?
... Nice! Relative URLs break it though... :( new URL('/stuff?foo=bar#baz')-> SyntaxError: Failed to construct 'URL': Invalid URL
– lakenen
Jun 10 '14 at 20:25
58
...
Laravel Eloquent ORM Transactions
...
If you don't like anonymous functions:
try {
DB::connection()->pdo->beginTransaction();
// database queries here
DB::connection()->pdo->commit();
} catch (\PDOException $e) {
// Woopsy
DB::connection()->pdo->rollBack();
}
Update: For laravel 4, the p...
PDOException SQLSTATE[HY000] [2002] No such file or directory
...
I had to add "'unix_socket' => '/Applications/MAMP/tmp/mysql/mysql.sock'" to config/database.php
– Ángel Carlos del Pozo Muela
Jan 31 '18 at 12:23
...
How to create a trie in Python
...imple trie in just a few lines. First, a function to construct the trie:
>>> _end = '_end_'
>>>
>>> def make_trie(*words):
... root = dict()
... for word in words:
... current_dict = root
... for letter in word:
... current_dict = curr...
Rails formatting date
...re-2.2.1/Time.html#method-i-strftime).
From APIdock:
%Y%m%d => 20071119 Calendar date (basic)
%F => 2007-11-19 Calendar date (extended)
%Y-%m => 2007-11 Calendar date, reduced accuracy, specific month
%Y...
I cannot start SQL Server browser
...
If it is disabled, go to Control Panel->Administrative Tools->Services, and look for the SQL Server Agent. Right-click, and select Properties From the Startup Type dropdown, change from Disabled to Automatic.
...
Get the cartesian product of a series of lists?
...
import itertools
>>> for i in itertools.product([1,2,3],['a','b'],[4,5]):
... print i
...
(1, 'a', 4)
(1, 'a', 5)
(1, 'b', 4)
(1, 'b', 5)
(2, 'a', 4)
(2, 'a', 5)
(2, 'b', 4)
(2, 'b', 5)
(3, 'a', 4)
(3, 'a', 5)
(3, 'b', 4)
(3, ...
How to remove specific element from an array using python
...
You don't need to iterate the array. Just:
>>> x = ['ala@ala.com', 'bala@bala.com']
>>> x
['ala@ala.com', 'bala@bala.com']
>>> x.remove('ala@ala.com')
>>> x
['bala@bala.com']
This will remove the first occurence that matches the st...