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Immutable vs Mutable types
... that's complicated by the fact that augmented assignment, like a += b sometimes is mutation. And the fact that assignment to part of a larger object sometimes means mutation of that larger object, just never mutation of the part—e.g., a[0] = b doesn't mutate a[0], but it probably does mutate a…...
Finding what methods a Python object has
...omma at the end of the print, makes it printing
# in the same line, 4 times (count)
print "| {0: <20}".format(method),
count += 1
if count == 4:
count = 0
print
dir_attributes.py (Python 3.4.3)
#!/usr/bin/python3
""" Demonstrates the usage of dir(), with better o...
When is it better to use String.Format vs string concatenation?
...ot check the parameters against the format string and you end up with a runtime error (that is, if you're lucky enough not to have it in an obscure method, such as logging an error). With concatenation, removing a parameter is less error prone. You could argue the chance of error is very small, but ...
Find and replace strings in vim on multiple lines
...t;/g
:14,18s/<search_string>/<replace_string>/g
The second time all you need to adjust is the range so instead of typing it all out, I would recall the last command and edit just the range
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Convert PHP closing tag into comment
...?:\s*<br\s*'.'/?'.'>)+#i', '<br />', $string);
Remember, sometimes, even though the whole is more than the sum of its parts - but being greedy is bad, there are times you are better left with less. :)
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How to get the seconds since epoch from the time + date output of gmtime()?
How do you do reverse gmtime() , where you put the time + date and get the number of seconds?
6 Answers
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how do I use the grep --include option for multiple file types?
...include=".{html,php}" to prevent shell from expanding '' which at the same time stop shell to expand {html,php}. It seems that equal sign in --include=* is able to prevent shell from expanding '*'.
– tianyapiaozi
May 17 '12 at 4:53
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Escape a string for a sed replace pattern
...ases previously not accounted for, the commands above have changed several times. Check the edit history for details.
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How to resolve symbolic links in a shell script
...e symlinks. Bonus points for also resolving ~username notation at the same time.
19 Answers
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了解 Boost Filesystem Library - C/C++ - 清泛网 - 专注C/C++及内核技术
... 异常报告运行时错误。boost::filesystem_error 类派生自std::runtime_error 类。库中的函数使用 filesystem_error 异常报告操作错误。与不同的可能错误类型对应，Boost 头文件定义了相应的错误代码。用户代码通常驻留在 try...catch 块内，使用...