Matthew Hawkes_ONS mh0w

## Get script's directory.py
import os
print(os.path.dirname(os.path.realpath(__file__)))

## detect python version inside python kernel.py
import sys
sys.version_info

## check object size.py
"""
sys:
Return the size of an object in bytes.The object can be any type of object.
All built-in objects will return correct results, but this does not have to
hold true for third-party extensions as it is implementation specific.

pandas/polars:
Returns the size of an object in KB/MB/GB. Checking the dtypes will be
informative (e.g., float64 likely to use more space than int8).
"""

## check if file exists.py
import os

os.path.exists('xxx.txt')

## get the class name of an object.py
a = "x"
b = 1
c = 1.2

print(a.__class__.__name__)  # str
print(b.__class__.__name__)  # int
print(c.__class__.__name__)  # float

## check if a variable exists.py
a = 1

'a' in locals()  # True
'z' in locals()  # False

'a' in globals()  # True
'z' in globals()  # False

## lists: create, remove, clear.py
mylist = ['a', 'b', 'c', 'd']

# Remove item 1
mylist.pop(1) #'b'
print(l) #['a', 'c', 'd']

# Remove item with value 'd'
mylist.remove('d')
print(l) # ['a', 'c']

## get N largest values from a list.py
import heapq

print(heapq.nlargest(3, [10, 5, 3, 8, 4, 2]))  # [10, 8, 5]

## convert two list to a list of tuples.py
l1 = [1,2,3]
l2 = [4,5,6]
print(list(zip(l1, l2))) #[(1, 4), (2, 5), (3, 6)]

## convert list of tuples to two lists.py
z = zip(*[(1, 2), (3, 4), (5, 6)])
l1, l2 = map(list, z)
print(l1) #[1, 3, 5]
print(l2) #[2, 4, 6]
	"""
	sys:
	Return the size of an object in bytes.The object can be any type of object.
	All built-in objects will return correct results, but this does not have to
	hold true for third-party extensions as it is implementation specific.

	pandas/polars:
	Returns the size of an object in KB/MB/GB. Checking the dtypes will be
	informative (e.g., float64 likely to use more space than int8).
	"""
	a = "x"
	b = 1
	c = 1.2

	print(a.__class__.__name__) # str
	print(b.__class__.__name__) # int
	print(c.__class__.__name__) # float
	a = 1

	'a' in locals() # True
	'z' in locals() # False

	'a' in globals() # True
	'z' in globals() # False
	import heapq

	print(heapq.nlargest(3, [10, 5, 3, 8, 4, 2])) # [10, 8, 5]
	l1 = [1,2,3]
	l2 = [4,5,6]
	print(list(zip(l1, l2))) #[(1, 4), (2, 5), (3, 6)]
	z = zip(*[(1, 2), (3, 4), (5, 6)])
	l1, l2 = map(list, z)
	print(l1) #[1, 3, 5]
	print(l2) #[2, 4, 6]