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Pandas DataFrame Groupby two columns and get counts
...In [56]: df.groupby(['col5','col2']).size().reset_index().groupby('col2')[[0]].max()
Out[56]:
0
col2
A 3
B 2
C 1
D 3
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Checking for a null int value from a Java ResultSet
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What does the comma operator , do?
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answered Sep 9 '08 at 18:37
lillqlillq
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Why does PEP-8 specify a maximum line length of 79 characters? [closed]
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130
Much of the value of PEP-8 is to stop people arguing about inconsequential formatting rules, and...
How to convert string into float in JavaScript?
...m a datagrid. The fields are numeric, and when they have a comma (ex. 554,20), I can't get the numbers after the comma. I've tried parseInt and parseFloat . How can I do this?
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Parsing JSON with Unix tools
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answered Dec 23 '09 at 21:59
Brian CampbellBrian Campbell
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How to get a variable value if variable name is stored as string?
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answered Dec 17 '09 at 12:09
Phil RossPhil Ross
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How to correctly sort a string with a number inside? [duplicate]
...(key=natural_keys) sorts in human order
http://nedbatchelder.com/blog/200712/human_sorting.html
(See Toothy's implementation in the comments)
'''
return [ atoi(c) for c in re.split(r'(\d+)', text) ]
alist=[
"something1",
"something12",
"something17",
"something2",
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How to check whether a string contains a substring in JavaScript?
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14067
ECMAScript 6 introduced String.prototype.includes:
const string = "foo";
const substri...
【解决】bufferevent_openssl.c:228:19: error: storage size of \'methods...
...revent_openssl.lo' failed
原因：
系统openssl的安装版本是1.1.0+，而xunsearch安装包里的libevent 2.0.x需要openssl < 1.1.0，导致不兼容报错。
常用的几个Linux发行版已经把系统的openssl升级到了1.1.0+，即对应需要libevent 2.1.x+，而libevent 2.1.x...