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'id' is a bad variable name in Python
Why is it bad to name a variable id in Python?
9 Answers
9
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mysql_fetch_array()/mysql_fetch_assoc()/mysql_fetch_row()/mysql_num_rows etc… expects parameter 1 to
...ir respective query functions/methods. You need to test for that error condition and handle it accordingly.
mysql_* extension:
NOTE The mysql_ functions are deprecated and have been removed in php version 7.
Check $result before passing it to mysql_fetch_array. You'll find that it's false bec...
搭建高可用mongodb集群（二）—— 副本集 - 大数据 & AI - 清泛网 - 专注C/...
...n Dec 29 20:12:02.953 [rsStart] replSet info you may need to run replSetInitiate -- rs.initiate() in the shell -- if that is not already done
5、初始化副本集
在三台机器上任意一台机器登陆mongodb
/data/mongodbtest/mongodb-linux-x86_64-2.4.8/bin/mongo
#使用admin数...
How to avoid .pyc files?
Can I run the python interpreter without generating the compiled .pyc files?
10 Answers
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Determine if 2 lists have the same elements, regardless of order? [duplicate]
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You can simply check whether the multisets with the elements of x and y are equal:
import collections
collections.Counter(x) == collections.Counter(y)
This requires the elements to be hashable; runtime will be in O(n), where n is the size of the lists.
If the eleme...
How to write iOS app purely in C
...
Damn, it took me a while but I got it:
main.c:
#include <CoreFoundation/CoreFoundation.h>
#include <objc/runtime.h>
#include <objc/message.h>
// This is a hack. Because we are writing in C, we cannot out and i...
Useful code which uses reduce()? [closed]
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The other uses I've found for it besides + and * were with and and or, but now we have any and all to replace those cases.
foldl and foldr do come up in Scheme a lot...
Here's some cute usages:
Flatten a list
Goal: turn [[1, 2, 3], [4, 5], [6, 7, 8]...
How to print an exception in Python?
...follow
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edited Aug 16 '18 at 8:01
Jan
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answered Sep...
Read a file in Node.js
I'm quite puzzled with reading files in Node.js.
8 Answers
8
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How to call a PHP function on the click of a button
...reated a page called functioncalling.php that contains two buttons, Submit and Insert .
12 Answers
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