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When to use symbols instead of strings in Ruby?
..., mode: "ascii")
# removed for brevity
end
write(data: 123, file: "test.txt")
freeze to keep as a string and save memory
label = 'My Label'.freeze
share
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improve this answe...
在线服务的黑天鹅 - 资讯 - 清泛网 - 专注C/C++及内核技术
...用百分比来表示。在线服务通常看到最多的是以下3种
99.9%，服务中断时间：525.6分钟/年
99.99%，服务中断时间：52.56分钟/年
99.999%，服务中断时间：5.256分钟/年
当一个系统有大量用户使用之后，对系统可用性有较高要求，...
Getting key with maximum value in dictionary?
..., 91: 93, 92: 18, 93: 18, 94: 106, 95: 106, 96: 13, 9232: 35,
98: 26, 99: 26, 100: 26, 101: 26, 103: 88, 104: 13, 106: 13, 107: 101, 1132: 63,
2158: 51, 112: 21, 113: 13, 116: 21, 118: 34, 119: 34, 7288: 45, 121: 96, 122: 21,
124: 109, 125: 109, 128: 8, 1154: 32, 131: 29, 134: 29, 136...
How to print a number with commas as thousands separators in JavaScript
...ith commas as thousands separators. For example, I want to show the number 1234567 as "1,234,567". How would I go about doing this?
...
How to do exponential and logarithmic curve fitting in Python? I found only polynomial fitting
...ion
from sklearn.preprocessing import FunctionTransformer
np.random.seed(123)
# General Functions
def func_exp(x, a, b, c):
"""Return values from a general exponential function."""
return a * np.exp(b * x) + c
def func_log(x, a, b, c):
"""Return values from a general log function...
What happens if I define a 0-size array in C/C++?
...
An array cannot have zero size.
ISO 9899:2011 6.7.6.2:
If the expression is a constant expression, it shall have a value greater than zero.
The above text is true both for a plain array (paragraph 1). For a VLA (variable length array), the behavior is undef...
ReSharper warns: “Static field in generic type”
...tity{ SomeValue = "Bar" };
var thirdInst = new OtherEntity { OtherValue = 123 };
var fourthInst = new OtherEntity { OtherValue = 456 };
var xmlData1 = firstInst.Serialize();
var xmlData2 = secondInst.Serialize();
var xmlData3 = thirdInst.Serialize();
var xmlData4 = fourthInst.Serialize();
In thi...
How do I profile memory usage in Python?
...
123
This one has been answered already here: Python memory profiler
Basically you do something li...
How to use Regular Expressions (Regex) in Microsoft Excel both in-cell and loops
...alues of 12abc will return abc, value of 1abc will return abc, value of abc123 will return "Not Matched" because the digits were not at the start of the string.
Private Sub simpleRegex()
Dim strPattern As String: strPattern = "^[0-9]{1,2}"
Dim strReplace As String: strReplace = ""
Dim r...
linux 下巧妙使用squid代理服务器 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...直接上网！
1.用setup配网络参数:
2. 安装squid
[root@gjp99 ~]# mkdir /mnt/cdrom
[root@gjp99 ~]# mount /dev/cdrom /mnt/cdrom
mount: block device /dev/cdrom is write-protected, mounting read-only
[root@gjp99 Server]# rpm -ql squid |less
查看注释语句：
/etc/httpd/conf.d...