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Drop all duplicate rows across multiple columns in Python Pandas
...t pandas as pd
df = pd.DataFrame({"A":["foo", "foo", "foo", "bar"], "B":[0,1,1,1], "C":["A","A","B","A"]})
df.drop_duplicates(subset=['A', 'C'], keep=False)
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Extracting the last n characters from a ruby string
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101
Here you have a one liner, you can put a number greater than the size of the string:
"123".sp...
Add column with constant value to pandas dataframe [duplicate]
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The reason this puts NaN into a column is because df.index and the Index of your right-hand-side...
List of all index & index columns in SQL Server DB
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edited Sep 24 at 2:11
jswolf19
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answered Apr 19 '09 at 1...
Why does ++[[]][+[]]+[+[]] return the string “10”?
This is valid and returns the string "10" in JavaScript ( more examples here ):
9 Answers
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rreplace - How to replace the last occurrence of an expression in a string?
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197
>>> def rreplace(s, old, new, occurrence):
... li = s.rsplit(old, occurrence)
... r...
Accessing the index in 'for' loops?
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edited Sep 17 '16 at 10:13
Peter Mortensen
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Repeat each row of data.frame the number of times specified in a column
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175
Here's one solution:
df.expanded <- df[rep(row.names(df), df$freq), 1:2]
Result:
va...
How to pass optional arguments to a method in C++?
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145
Here is an example of passing mode as optional parameter
void myfunc(int blah, int mode = 0)...