大约有 44,300 项符合查询结果（耗时：0.0325秒） [XML]
Difference between map, applymap and apply methods in Pandas
...
Straight from Wes McKinney's Python for Data Analysis book, pg. 132 (I highly recommended this book):
Another frequent operation is applying a function on 1D arrays to each column or row. DataFrame’s apply method does exactly this:
In [116]: frame = DataFrame(np.random.randn(4, 3), ...
JavaScript equivalent to printf/String.Format
...
1
2
Next
1165
...
Reorder levels of a factor without changing order of values
...
121
Use the levels argument of factor:
df <- data.frame(f = 1:4, g = letters[1:4])
df
# f g
#...
How to jump from Intellij terminal to editor with shortcut
...ould be nice since I can jump from my editor to the terminal with Alt + F12 but I cannot do it the other way without using my mouse.
...
Python add item to the tuple
...r session as tuple. When I add first one it works but tuple looks like (u'2',) but when I try to add new one using mytuple = mytuple + new.id got error can only concatenate tuple (not "unicode") to tuple .
...
how to convert array values from string to int?
...
552
You can achieve this by following code,
$integerIDs = array_map('intval', explode(',', $string)...
How do you round a number to two decimal places in C#?
...
Here's some examples:
decimal a = 1.994444M;
Math.Round(a, 2); //returns 1.99
decimal b = 1.995555M;
Math.Round(b, 2); //returns 2.00
You might also want to look at bankers rounding / round-to-even with the following overload:
Math.Round(a, 2, MidpointRounding.ToEven);
There's...
How to find where a method is defined at runtime?
...
422
This is really late, but here's how you can find where a method is defined:
http://gist.github...
Integrating MySQL with Python in Windows
...
127
Download page for python-mysqldb. The page includes binaries for 32 and 64 bit versions of for ...
Lambda function in list comprehensions
...
271
The first one creates a single lambda function and calls it ten times.
The second one doesn't ...