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Why isn't `int pow(int base, int exponent)` in the standard C++ libraries?
...a perfectly good way of doing integer powers (with doubles and then simply converting back to an integer, checking for integer overflow and underflow before converting).
Second, another thing you have to remember is that the original intent of C was as a systems programming language, and it's quest...
How to find foreign key dependencies in SQL Server?
...hat can be used: https://docs.microsoft.com/en-us/sql/relational-databases/system-stored-procedures/sp-fkeys-transact-sql
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How to prettyprint a JSON file?
...when I created this example image. It doesn't seem to be working now on my system as well.
– Shubham Chaudhary
Jan 30 '18 at 9:19
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Prepend a level to a pandas MultiIndex
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I think this is a more general solution:
# Convert index to dataframe
old_idx = df.index.to_frame()
# Insert new level at specified location
old_idx.insert(0, 'new_level_name', new_level_values)
# Convert back to MultiIndex
df.index = pandas.MultiIndex.from_frame(ol...
How to implement a rule engine?
...yParse(r.Operator, out tBinary)) {
var right = Expression.Constant(Convert.ChangeType(r.TargetValue, tProp));
// use a binary operation, e.g. 'Equal' -> 'u.Age == 21'
return Expression.MakeBinary(tBinary, left, right);
} else {
var method = tProp.GetMethod(r.Op...
Sleeping in a batch file
... following sleep.py script and add it somewhere in your PATH:
import time, sys
time.sleep(float(sys.argv[1]))
It will allow sub-second pauses (for example, 1.5 sec, 0.1, etc.), should you have such a need. If you want to call it as sleep rather than sleep.py, then you can add the .PY extension to ...
What is the perfect counterpart in Python for “while not EOF”
....
You can do the same with the stdin (no need to use raw_input():
import sys
for line in sys.stdin:
do_something()
To complete the picture, binary reads can be done with:
from functools import partial
with open('somefile', 'rb') as openfileobject:
for chunk in iter(partial(openfileobj...
Automatically import modules when entering the python or ipython interpreter
...s .startup.py file
print("(.startup.py)")
import datetime, os, pprint, re, sys, time
print("(imported datetime, os, pprint, re, sys, time)")
pp = pprint.pprint
Then define PYTHONSTARTUP=~/.startup.py, and Python will use it when starting a shell.
The print statements are there so when I start th...
Rounding a double to turn it into an int (java)
...value is 64bit, but then your int variable can only store 32bit so it just converts it to long, which is 64bit but you can typecast it to 32bit as explained above.
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What is the difference between Numpy's array() and asarray() functions?
...u're sort of just changing your view on this list/array. "array": Actually convert this to a new array.
– denvar
May 4 '16 at 18:41
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