(TIL) Python: Nested Comprehensions
You probably know how to rewrite a for loop such as:
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(TIL) Python: Collect garbage
If you have a variable with a large memory footprint, you can force garbage collection using the gc Garbage Collector module:
(TIL) Python: Class inheritance
You can check for class inheritance relationships with the issubclass() built-in:
(TIL) Python: Check if string is null or empty
if mystring and mystring.strip(): print "not null and not empty string" else: print "null or empty string"
(TIL) Spark: Calculating the length of a column with size
In Spark >= 1.5 you can use the size function to calculate the length of a column: