大约有 47,000 项符合查询结果（耗时：0.0476秒） [XML]
Pandas get topmost n records within each group
...
Did you try df.groupby('id').head(2)
Ouput generated:
>>> df.groupby('id').head(2)
id value
id
1 0 1 1
1 1 2
2 3 2 1
4 2 2
3 7 3 1
4 8 4 1
(Keep in mind that you might nee...
Selecting pandas column by location
... to mind:
>>> df
A B C D
0 0.424634 1.716633 0.282734 2.086944
1 -1.325816 2.056277 2.583704 -0.776403
2 1.457809 -0.407279 -1.560583 -1.316246
3 -0.757134 -1.321025 1.325853 -2.513373
4 1.366180 -1.265185 -2.184617 0.881514
>>> df.iloc[...
What's the 'Ruby way' to iterate over two arrays at once
...
277
>> @budget = [ 100, 150, 25, 105 ]
=> [100, 150, 25, 105]
>> @actual = [ 120, 1...
Regex to validate date format dd/mm/yyyy
...
20 Answers
20
Active
...
How do I list all versions of a gem available at a remote site?
...
205
Well, it was easier than I thought (well, not really, let's say as easy as it should be):
gem...
Determine the data types of a data frame's columns
...
220
Your best bet to start is to use ?str(). To explore some examples, let's make some data:
s...
How to reorder data.table columns (without copying)
...
2 Answers
2
Active
...
What is the optimal Jewish toenail cutting algorithm?
...le. Luckily, humans only have five toes per foot*, so there are only 5! = 120 unrestricted sequences.
Python example:
#seq is only valid when consecutive elements in the list differ by at least two.
def isValid(seq):
for i in range(len(seq)-1):
a = seq[i]
b = seq[i+1]
...
How to add title to subplots in Matplotlib?
...
225
ax.title.set_text('My Plot Title') seems to work too.
fig = plt.figure()
ax1 = fig.add_subplo...
深入解析ATL - 文档下载 - 清泛网 - 专注IT技能提升
...由当今4位顶尖的Windows技术专家联合撰写。 书籍目录：第2版序第1版序前言...
《深入解析ATL》主要介绍了ATL技术的原理、内部实现和应用技巧，由当今4位顶尖的Windows技术专家联合撰写。
书籍目录：
第2版序
第1版序
前...