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Upload files with HTTPWebrequest (multipart/form-data)
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Took the code above and fixed because it throws Internal Server Error 500. There are some problems with \r\n badly positioned and spaces etc. Applied the refactoring with memory stream, writing directly to the request stream. Here is the result:
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count the frequency that a value occurs in a dataframe column
...b')})
df.groupby('a').count()
Out[37]:
a
a
a 2
b 3
s 2
[3 rows x 1 columns]
See the online docs: http://pandas.pydata.org/pandas-docs/stable/groupby.html
Also value_counts() as @DSM has commented, many ways to skin a cat here
In [38]:
df['a'].value_counts()
Out[38]:
b 3
a 2
s...
How default .equals and .hashCode will work for my classes?
...valence relation on objects; that is, for any non-null reference values x and y, this method returns
true if and only if x and y refer to the same object (x == y has the value true).
hashCode
As much as is reasonably practical, the hashCode method defined by class Object does return dist...
How to show full object in Chrome console?
... improves on @BastiBen's by formatting the output.
– Xeoncross
Apr 24 '19 at 19:25
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in iPhone App How to detect the screen resolution of the device
...the entire screen's resolution in points, so it would most typically be 320x480 for iPhones. Even though the iPhone4 has a much larger screen size iOS still gives back 320x480 instead of 640x960. This is mostly because of older applications breaking.
CGFloat screenScale = [[UIScreen mainScreen] sca...
Regular expression for a hexadecimal number?
How do I create a regular expression that detects hexadecimal numbers in a text?
11 Answers
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Get raw POST body in Python Flask regardless of Content-Type header
...a received in Flask request because request.data was empty. The answer explained that request.data is the raw post body, but will be empty if form data is parsed. How can I get the raw post body unconditionally?
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Sequence contains more than one element
...leOrDefault. This method will only succeed when the collections contains exactly 0 or 1 element. I believe you are looking for FirstOrDefault which will succeed no matter how many elements are in the collection.
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Smarty中date_format日期格式化详解 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...的第几周数，从第一周的第一个星期一作为第一天开始
%x - 当前区域首选的时间表示法，不包括时间
%X - 当前区域首选的时间表示法，不包括日期
%y - 没有世纪数的十进制年份（范围从 00 到 99）
%Y - 包括世纪数的十进制年份
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