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How to turn NaN from parseInt into 0 for an empty string?
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edited Dec 2 '19 at 20:44
isherwood
42.9k1414 gold badges9494 silver badges122122 bronze badges
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Reusable library to get human readable version of file size?
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22 Answers
22
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MySQL foreign key constraints, cascade delete
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392
If your cascading deletes nuke a product because it was a member of a category that was killed, ...
How to return 2 values from a Java method?
I am trying to return 2 values from a Java method but I get these errors. Here is my code:
14 Answers
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Creating a custom JButton in Java
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edited Oct 27 '16 at 7:19
Lahiru Ashan
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answered Aug...
Combine two or more columns in a dataframe into a new column with a new name
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132
Use paste.
df$x <- paste(df$n,df$s)
df
# n s b x
# 1 2 aa TRUE 2 aa
# 2 3 bb F...
How to filter Pandas dataframe using 'in' and 'not in' like in SQL
...le:
import pandas as pd
>>> df
country
0 US
1 UK
2 Germany
3 China
>>> countries_to_keep
['UK', 'China']
>>> df.country.isin(countries_to_keep)
0 False
1 True
2 False
3 True
Name: country, dtype: bool
>>> df[df.country.isin(cou...
Batch renaming files with Bash
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192
You could use bash's parameter expansion feature
for i in ./*.pkg ; do mv "$i" "${i/-[0-9.]*.pk...