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Is System.nanoTime() completely useless?
...ion time measurements directly, specialized benchmarking frameworks and profilers should preferably be used, for example JMH and async-profiler in wall-clock profiling mode.
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How to merge dictionaries of dictionaries?
...s" into "%s"' % (e, key, b, a))
return a
My use case is merging YAML files where I only have to deal with a subset of possible data types. Hence I can ignore tuples and other objects. For me a sensible merge logic means
replace scalars
append lists
merge dicts by adding missing keys and upda...
Does deleting a branch in git remove it from the history?
... it initially sounds. git also has an efficient storage optimization (pack files) which make even more efficient usage of disk space.
– CB Bailey
Apr 12 '10 at 9:29
23
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Assert a function/method was not called using Mock
... was called and should not have been'
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
AssertionError: a was called and should not have been
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What are the risks of running 'sudo pip'?
...nd pip doesn't need all that privileges, only the write access to specific files and directories. If you can't use your system's package manager and do not want to go the virtual environment way, you may create a specific user that has write privilege to the python installation directory and use it ...
Return multiple columns from pandas apply()
...he following in ipython console. It will not work if you run it from a .py file.
print('\nAccepted Answer (pass series, return series, new columns dont exist):')
df_test = create_new_df_test()
%timeit result = df_test.apply(sizes_pass_series_return_series, axis=1)
print('Accepted Answer (pass series...
How can I reliably get an object's address when operator& is overloaded?
...e the type does not match the T* parameter.
Note: from the remarks in the file regarding Borland compatibility, arrays do not decay to pointers, but are passed by reference.
What happens in this overload ?
We want to avoid applying operator& to the type, as it may have been overloaded.
T...
Cannot change column used in a foreign key constraint
...fore modifying your data and then an unlock when you're done. Using an sql file to do your changes in the shortest amount of time possible would be even better.
– Francisco Zarabozo
Feb 14 '18 at 17:45
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How to use double or single brackets, parentheses, curly braces
...in the current shell context, e.g.
$ { date; top -b -n1 | head ; } >logfile
# 'date' and 'top' output are concatenated,
# could be useful sometimes to hunt for a top loader )
$ { date; make 2>&1; date; } | tee logfile
# now we can calculate the duration of a build from the logfile
T...
What is Dependency Injection and Inversion of Control in Spring Framework?
...he only work the developer does is configuring the beans in the spring xml file.
Dependency injection-
Consider a class Employee
class Employee {
private int id;
private String name;
private Address address;
Employee() {
id = 10;
name="name";
address = new Address();
...