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How to check whether a variable is a class or not?
... inspect.isclass function.
>>> import inspect
>>> class m>X m>(object):
... pass
...
>>> inspect.isclass(m>X m>)
True
>>> m>x m> = m>X m>()
>>> isinstance(m>x m>, m>X m>)
True
>>> y = 25
>>> isinstance(y, m>X m>)
False
...
Split column at delimiter in data frame [duplicate]
... split one column into two within at data frame based on a delimiter. For em>x m>ample,
6 Answers
...
Use of 'prototype' vs. 'this' in JavaScript?
...
The em>x m>amples have very different outcomes.
Before looking at the differences, the following should be noted:
A constructor's prototype provides a way to share methods and values among instances via the instance's private [[Prot...
Normalize data in pandas
...0.932785 4.535396 0.598124
In [93]: df_norm = (df - df.mean()) / (df.mam>x m>() - df.min())
In [94]: df_norm
Out[94]:
a b c d
A 0.085789 -0.394348 0.337016 -0.109935
B -0.463830 0.164926 -0.650963 0.256714
C -0.158129 0.605652 -0.035090 -0.573389
D 0.536170 -0...
What part of Hindley-Milner do you not understand?
...orizontal bar means that "[above] implies [below]".
If there are multiple em>x m>pressions in [above], then consider them anded together; all of the [above] must be true in order to guarantee the [below].
: means has type
∈ means is in. (Likewise ∉ means "is not in".)
Γ is usually used to refer to a...
MySQL Conditional Insert
... DBMS does not impose limitations on which table you select from when you em>x m>ecute an insert, try:
INSERT INTO m>x m>_table(instance, user, item)
SELECT 919191, 123, 456
FROM dual
WHERE NOT Em>X m>ISTS (SELECT * FROM m>x m>_table
WHERE user = 123
...
STL 算法 - C/C++ - 清泛网 - 专注C/C++及内核技术
...mplate<class InIt1, class InIt2> bool equal(InIt1 first, InIt1 last, InIt2 m>x m>);
template<class InIt1, class InIt2, class Pred> bool equal(InIt1 first, InIt1 last, InIt2 m>x m>, Pred pr);
includes
<algorithm>
判断第一个指定范围内的所有元素是否都被第二个范围包含...
What's the difference between a prom>x m>y server and a reverse prom>x m>y server? [closed]
What is the difference between a prom>x m>y server and a reverse prom>x m>y server?
21 Answers
2...
How to apply a function to two columns of Pandas dataframe
...
Here's an em>x m>ample using apply on the dataframe, which I am calling with am>x m>is = 1.
Note the difference is that instead of trying to pass two values to the function f, rewrite the function to accept a pandas Series object, and then inde...