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Implement touch using Python?
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# Current directory which is "walked through"
# | Directories in root
# | | Files in root Working directory
# | | | |
for root, _, filenames in os.walk('.'):
for fname in filenames:
pathname = os.path.join(root, fname)
try:
os.utime(p...
Are there disadvantages to using a generic varchar(255) for all text-based fields?
...ould always store 255 characters.
But since you tagged this question with MySQL, I'll mention a MySQL-specific tip: as rows are copied from the storage engine layer to the SQL layer, VARCHAR fields are converted to CHAR to gain the advantage of working with fixed-width rows. So the strings in mem...
Why is SSE scalar sqrt(x) slower than rsqrt(x) * x?
...th on an Intel Core Duo, and while looking at various approaches to square root I've noticed something odd: using the SSE scalar operations, it is faster to take a reciprocal square root and multiply it to get the sqrt, than it is to use the native sqrt opcode!
...
How do I adb pull ALL files of a folder present in SD Card
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If you want to pull a folder owned by root, start an adb root session (using $ adb root).
– MasterAM
Jun 12 '14 at 13:32
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MySQL Results as comma separated list
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The intent is fine and MySQL will allow this, but be careful (generally) with your use of GROUP BY. The items in the select list need to be valid aggregates in the context of the GROUP BY clause. In this case, p.name is not strictly valid. Any d...
What are the applications of binary trees?
...hing when you balance them. This involves rotating sub-trees through their root node so that the height difference between any two sub-trees is less than or equal to 1. Adding those names above one at a time into a balanced tree would give you the following sequence:
1. Alice
/ \
= ...
Delete files older than 15 days using PowerShell
... days from the current date and compare CreationTime against that value:
$root = 'C:\root\folder'
$limit = (Get-Date).AddDays(-15)
Get-ChildItem $root -Recurse | ? {
-not $_.PSIsContainer -and $_.CreationTime -lt $limit
} | Remove-Item
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那些我印象深刻的建议和教诲 - 杂谈 - 清泛网 - 专注C/C++及内核技术
...负有心人”和“蠢”之间可能连窗户纸都没有，只看个人如何面对了。
多用Google吧
我工作的第一天，项目经理把我叫去说：给你们讲讲JUnit, SVN，Ant, JBuilder的用法，明天开始用。这四样东西我以前都没有接触过，第一反应就是...
Python class inherits object
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Calling the root class object isn't all that confusing, and in fact it's pretty standard. Smalltalk has a root class named Object, and a root metaclass named Class. Why? Because, just as Dog is a class for dogs, Object is a class for obj...
PHP: Convert any string to UTF-8 without knowing the original character set, or at least try
...a pure UTF-8 stack all the way through to your database. I have been using MySQL's utf8mb4 encoding for tables, fields, and connections.
My situation boiled down to "I just want my sanitizers, validators, business logic, and prepared statements to deal with UTF-8 when data comes from HTML forms, or...