大约有 40,000 项符合查询结果（耗时：0.0512秒） [XML]
Split delimited strings in a column and insert as new rows [duplicate]
... V2 = unlist(s))
## V1 V2
## 1 1 a
## 2 1 b
## 3 1 c
## 4 2 a
## 5 2 c
## 6 3 b
## 7 3 d
## 8 4 e
## 9 4 f
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How do I get a list of all the duplicate items using pandas in python?
...E TRAINER_MANAGING TRAINER_OPERATOR FIRST_VISIT_DATE
24 11795 27-Feb-12 0643D38-Hanover NH 0643D38-Hanover NH 19-Jun-12
6 11795 3-Jul-12 0649597-White River VT 0649597-White River VT 30-Mar-12
18 8096 19-Dec-11 0649597-White River VT ...
Annotating text on individual facet in ggplot2
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+50
Typically you'd do something like this:
ann_text <- data.frame(mpg = 15,wt = 5,lab = "Text",
cyl = factor(...
How do I format a date with Dart?
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edited Jul 5 at 14:19
Philippe Fanaro
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Using Python 3 in virtualenv
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1415
simply run
virtualenv -p python3 envname
Update after OP's edit:
There was a bug in the OP's...
ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/tmp/mysql.sock'
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tokyovariable
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answered Jan 29 '14 at 5:12
shammerw0wshammerw0w
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How to install psycopg2 with “pip” on Python?
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answered Mar 27 '11 at 15:25
joarjoar
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What does map(&:name) mean in Ruby?
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519
It's shorthand for tags.map(&:name.to_proc).join(' ')
If foo is an object with a to_proc ...
Placeholder Mixin SCSS/CSS
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255
You're looking for the @content directive:
@mixin placeholder {
::-webkit-input-placeholder ...
How to keep index when using pandas merge
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In [5]: a.reset_index().merge(b, how="left").set_index('index')
Out[5]:
col1 to_merge_on col2
index
a 1 1 1
b 2 3 2
c 3 4 NaN
Note that for some left me...