大约有 16,000 项符合查询结果（耗时：0.0366秒） [XML]
How to remove all white spaces in java [duplicate]
...racters etc). You need to escape the backslash in Java so the regex turns into \\s. Also, since Strings are immutable it is important that you assign the return value of the regex to a.
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count the frequency that a value occurs in a dataframe column
...re
In [38]:
df['a'].value_counts()
Out[38]:
b 3
a 2
s 2
dtype: int64
If you wanted to add frequency back to the original dataframe use transform to return an aligned index:
In [41]:
df['freq'] = df.groupby('a')['a'].transform('count')
df
Out[41]:
a freq
0 a 2
1 b 3
2 s ...
Get raw POST body in Python Flask regardless of Content-Type header
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Thanks for pointing out that the stream will be empty if read through request.data before! Almost got me during debugging
– user1767754
Sep 21 at 5:20
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Approximate cost to access various caches and main memory?
...(in nanoseconds) to access L1, L2 and L3 caches, as well as main memory on Intel i7 processors?
5 Answers
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Which kind of pointer do I use when?
...available, and boost::shared_ptr was all the rage. I never really looked into the other smart pointer types boost provided. I understand that C++11 now provides some of the types boost came up with, but not all of them.
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How to define object in array in Mongoose schema correctly with 2d geo index
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After a while I found the problem: When I was sending the response, I was converting it to a string via .toString().
I fixed that and now it works brilliantly. Sorry for the false alarm.
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What is the difference between YAML and JSON?
...e structures in yaml: {a: &b [*b]}, which will loop infinitely in some converters. Even with circular detection, a "yaml bomb" is still possible (see xml bomb).
Because there are no references, it is impossible to serialize complex structures with object references in JSON. YAML serialization...
How should I choose an authentication library for CodeIgniter? [closed]
...is a noSql database. Is there a library which works with MoongoDB? I tried converting one of the libraries above to insert into MongoDB instead of MySql but it is getting too complex and would like to know a library which already does this
– Ninja
Oct 19 '11 at...
How to get different colored lines for different plots in a single figure?
...is is great. is there a way to make them interactive? for example in R I convert ggplot to ggplotly(), and the plot becomes html interactive
– kRazzy R
May 4 '18 at 14:44
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How to detect duplicate values in PHP array?
..., 'orange', 'pear', 'banana', 'apple',
'pear', 'kiwi', 'kiwi', 'kiwi');
print_r(array_count_values($array));
will output
Array
(
[apple] => 2
[orange] => 1
[pear] => 2
etc...
)
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