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Modifying a subset of rows in a pandas dataframe
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248
Use .loc for label based indexing:
df.loc[df.A==0, 'B'] = np.nan
The df.A==0 expression cre...
How can I read command line parameters from an R script?
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210
Dirk's answer here is everything you need. Here's a minimal reproducible example.
I made two ...
How do you remove duplicates from a list whilst preserving order?
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How to get the process ID to kill a nohup process?
...u could do something like this in the script:
nohup my_command > my.log 2>&1 &
echo $! > save_pid.txt
This will run my_command saving all output into my.log (in a script, $! represents the PID of the last process executed). The 2 is the file descriptor for standard error (stderr) a...
decorators in the python standard lib (@deprecated specifically)
... category=DeprecationWarning,
stacklevel=2)
warnings.simplefilter('default', DeprecationWarning) # reset filter
return func(*args, **kwargs)
return new_func
# Examples
@deprecated
def some_old_function(x, y):
return x + y
class SomeClass:...
What's the best way to inverse sort in scala?
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There may be the obvious way of changing the sign, if you sort by some numeric value
list.sor...
How to sort objects by multiple keys in Python?
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This answer works for any kind of column in the dictionary -- the negated column need not be a n...
What's the difference between “mod” and “remainder”?
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There is a difference between modulus and remainder. For example:
-21 mod 4 is 3 because -21 + 4 x 6 is 3.
But -21 divided by 4 gives -5 with a remainder of -1.
For positive values, there is no difference.
share
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Saving utf-8 texts in json.dumps as UTF8, not as \u escape sequence
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12 Answers
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How to discover number of *logical* cores on Mac OS X?
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812
You can do this using the sysctl utility:
sysctl -n hw.ncpu
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