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How do I resize an image using PIL and maintain its aspect ratio?
...humbnail.
Below is an (edited) example from the PIL documentation.
import os, sys
import Image
size = 128, 128
for infile in sys.argv[1:]:
outfile = os.path.splitext(infile)[0] + ".thumbnail"
if infile != outfile:
try:
im = Image.open(infile)
im.thumbnail(s...
Is Java really slow?
...rs use primitive collections and especially Javalution's libraries, where possible.
String operations are a bit slow. Java uses immutable, UTF-16-encoded string objects. This means you need more memory, more memory access, and some operations are more complex than with ASCII (C, C++). At the time, i...
Only get hash value using md5sum (without filename)
...he - indicates the source as stdin). – You must tell bash to capture those words into a string, using Command Substitution: $( command ). – The ( brackets ) produce a bash array with 2 elements. However, you must assign that array construct ( … ) to an variable name; hence, using md5 as the...
How to determine the Boost version on a system?
Is there a quick way to determine the version of the Boost C++ libraries on a system?
11 Answers
...
Reload Flask app when template file changes
...ment to Flask().run(), a collection of filenames to watch: any change on those files will trigger the reloader.
Example:
from os import path, walk
extra_dirs = ['directory/to/watch',]
extra_files = extra_dirs[:]
for extra_dir in extra_dirs:
for dirname, dirs, files in walk(extra_dir):
...
Using an SSH keyfile with Fabric
How do you configure fabric to connect to remote hosts using SSH keyfiles (for example, Amazon EC2 instances)?
8 Answers
...
How to Batch Rename Files in a macOS Terminal?
...se you can use the following bash command (bash is the default shell on macOS):
for f in *.png; do echo mv "$f" "${f/_*_/_}"; done
Note: If there's a chance that your filenames start with -, place -- before them[1]:
mv -- "$f" "${f/_*_/_}"
Note: echo is prepended to mv so as to perform a dry ru...
Running a Python script from PHP
...orrect privileges:
Taken from php manual:
Just a quick reminder for those trying to use shell_exec on a
unix-type platform and can't seem to get it to work. PHP executes as
the web user on the system (generally www for Apache), so you need to
make sure that the web user has rights to what...
App Inventor 2 TextboxUtil 扩展：消除输入框焦点（光标） · App Inventor 2 中文网
...框，可以在提交、取消和切换页面时都执行一次清除焦点操作。上面的演示图展示了这个典型用法。
方法
AddTextChangedListener添加文本变化监听(文本框)
监听文本框内容变化，变化时触发 OnTextChanged 事件。
...
服务器保持大量TIME_WAIT和CLOSE_WAIT的解决方法 - C/C++ - 清泛网 - 专注C/C++及内核技术
...TIME_WAIT的记录，维护这些状态给Server带来负担。当然现代操作系统都会用快速的查找算法来管理这些 TIME_WAIT，所以对于新的 TCP连接请求，判断是否hit中一个TIME_WAIT不会太费时间，但是有这么多状态要维护总是不好。
HTTP协议1...