大约有 35,800 项符合查询结果（耗时：0.0457秒） [XML]
Change one value based on another value in pandas
... for you.
import pandas
df = pandas.read_csv("test.csv")
df.loc[df.ID == 103, 'FirstName'] = "Matt"
df.loc[df.ID == 103, 'LastName'] = "Jones"
As mentioned in the comments, you can also do the assignment to both columns in one shot:
df.loc[df.ID == 103, ['FirstName', 'LastName']] = 'Matt', 'Jone...
BigDecimal - to use new or valueOf
...an be somewhat unpredictable. One might assume that writing new BigDecimal(0.1) in Java creates a BigDecimal which is exactly equal to 0.1 (an unscaled value of 1, with a scale of 1), but it is actually equal to 0.1000000000000000055511151231257827021181583404541015625. This is because 0.1 cannot be...
Does the ternary operator exist in R?
...
306
As if is function in R and returns the latest evaluation, if-else is equivalent to ?:.
> a ...
Are lists thread-safe?
...to concurrently access, the lists's data is not protected. For example:
L[0] += 1
is not guaranteed to actually increase L[0] by one if another thread does the same thing, because += is not an atomic operation. (Very, very few operations in Python are actually atomic, because most of them can cau...
How do I find all installed packages that depend on a given package in NPM?
...ich packages depend on contextify you can run:
npm ls contextify
app-name@0.0.1 /home/zorbash/some-project
└─┬ d3@3.3.6
└─┬ jsdom@0.5.7
└── contextify@0.1.15
share
|
improv...
How to easily resize/optimize an image size with iOS?
...one disk. Some of those images are pretty big in size (widths larger than 500 pixels, for instance). Since the iPhone doesn't even have a big enough display to show the image in its original size, I'm planning on resizing the image to something a bit smaller to save on space/performance.
...
tmux: How to join two tmux windows into one, as panes?
...
170
Actually I found the way to do that. Suppose the two windows are number 1 and 2. Use
join-pane ...
“x not in y” or “not x in y”
... 'ham' not in 'spam and eggs'
>>> dis.dis(notin)
2 0 LOAD_CONST 1 ('ham')
3 LOAD_CONST 2 ('spam and eggs')
6 COMPARE_OP 7 (not in)
9 POP_TOP
10 LOAD_CONST ...
Multiple inputs with same name through POST in php
...
220
Change the names of your inputs:
<input name="xyz[]" value="Lorem" />
<input name="xyz...
Getting the count of unique values in a column in bash
....Paused until further notice.
287k8181 gold badges340340 silver badges410410 bronze badges
add a comment
...