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How to split the name string in mysql?
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16 Answers
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Pandas get topmost n records within each group
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195
Did you try df.groupby('id').head(2)
Ouput generated:
>>> df.groupby('id').head(2)...
python dataframe pandas drop column using int
I understand that to drop a column you use df.drop('column name', axis=1). Is there a way to drop a column using a numerical index instead of the column name?
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How to convert a boolean array to an int array
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176
Numpy arrays have an astype method. Just do y.astype(int).
Note that it might not even be ne...
Pointers in Python?
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answered Jun 24 '10 at 5:58
Alex MartelliAlex Martelli
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Rank items in an array using Python/NumPy, without sorting array twice
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11 Answers
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How to convert list of tuples to multiple lists?
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166
The built-in function zip() will almost do what you want:
>>> zip(*[(1, 2), (3, 4), ...
How can I pass arguments to a batch file?
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17 Answers
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filter for complete cases in data.frame using dplyr (case-wise deletion)
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187
Try this:
df %>% na.omit
or this:
df %>% filter(complete.cases(.))
or this:
libra...
pandas: multiple conditions while indexing data frame - unexpected behavior
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221
As you can see, the AND operator drops every row in which at least one
value equals -1. On ...