大约有 36,000 项符合查询结果（耗时：0.0300秒） [XML]
pandas: How do I split text in a column into multiple rows?
...rnative:
time python -c "import pandas as pd;
from scipy import array, concatenate;
df = pd.DataFrame(['a b c']*100000, columns=['col']);
print pd.DataFrame(concatenate(df['col'].apply( lambda x : [x.split(' ')]))).head()"
... and this:
time python -c "import pandas as pd;
df = pd.DataFrame(['a ...
Insert new column into table in sqlite?
...ALTER TABLE {tableName} ADD COLUMN COLNew {type};
Second, and more complicatedly, but would actually put the column where you want it, would be to rename the table:
ALTER TABLE {tableName} RENAME TO TempOldTable;
Then create the new table with the missing column:
CREATE TABLE {tableName} (name...
Setting the correct encoding when piping stdout in Python
... because Python encodes the output to whatever encoding your terminal application is using. If you are piping you must encode it yourself.
A rule of thumb is: Always use Unicode internally. Decode what you receive, and encode what you send.
# -*- coding: utf-8 -*-
print u"åäö".encode('utf-8')
...
How to move screen without moving cursor in Vim?
... point I've accepted it. If you want to go down that road, there's xev -q, cat /proc/bus/input/devices to find the device to query and evtest or thd ... --dump /dev/input/event<#> to check the state, etc. If you absolutely must make a system-wide remapping, at least swap two locks like caps &l...
Error: could not find function … in R
... which package it is contained.
find and getAnywhere can also be used to locate functions.
If you have no clue about the package, you can use findFn in the sos package as explained in this answer.
RSiteSearch("some.function") or searching with rdocumentation or rseek are alternative ways to find the...
Disable HttpClient logging
...
For log4j, add the following to log4j.properties (in the application's source directory):
log4j.logger.org.apache=WARN
log4j.logger.httpclient=WARN
For logback, the following logback.xml will kill the noise:
<configuration>
<logger name="org.apache" level="WARN" />
...
Floating elements within a div, floats outside of div. Why?
...sed certain bits of text to become unreadable.
– Top Cat
Feb 23 '18 at 11:26
|
show 3 more comments
...
How to store standard error in a variable
...ROR=$(</tmp/Error)
The shell recognizes this and doesn't have to run 'cat' to get the data.
The bigger question is hard. I don't think there's an easy way to do it. You'd have to build the entire pipeline into the sub-shell, eventually sending its final standard output to a file, so that you...
Unable to set data attribute using jQuery Data() API
...bedded dashes was changed in jQuery 1.6 to conform to the W3C HTML5 specification.
So for <div data-role="page"></div> the following is true $('div').data('role') === 'page'
I'm fairly sure that $('div').data('data-role') worked in the past but that doesn't seem to be the case any mor...
How can you diff two pipelines in Bash?
...stitution, you can use tee to feed the same data into multiple pipelines:
cat *.txt | tee >(foo | bar > result1.txt) >(baz | quux > result2.txt) | foobar
share
|
improve this answer
...