simple Python library with coalesce function and "magic" empty value
Project description
Simple Python library with coalesce function and “magic” empty value and others features
Installation
pip install coalesce
Features
UniqueValue
This is a factory of some abstract unique values
Example:
from coalesce import UniqueValue
Yes = UniqueValue(truthful=True)
MayBe = UniqueValue()
IDontKnow = UniqueValue()
Unlikely = UniqueValue()
No = UniqueValue(truthful=False)
def answer_lottery():
import random
return random.choice((Yes, MayBe, IDontKnow, Unlikely, No))
print("- Are you hungry?")
hungry_answer = answer_lottery()
try:
if hungry_answer:
print("- YES, i would eat an elephant!")
else:
print("- I'm fed up...")
except TypeError:
print("- Well, I want only coffee")
print("- Will you marry me?")
marry_answer = answer_lottery()
if marry_answer == Yes:
print("- Well, finally, YES!")
elif marry_answer == MayBe:
print("- Well, only if you really are rich...")
elif marry_answer == IDontKnow:
print("- I need to think...")
elif marry_answer == Unlikely:
print("- When the cancer on the mountain whistles.")
elif marry_answer == No:
print("- Who are you, boy?")empty
The empty is conrete falsely UniqueValue.
Using in situations, when we want differ None and real “empty” value. For example set a dynamically calculated default value:
from coalesce import empty
from random import randint
def f(value=empty):
if value == empty:
value = randint(1,10)
print('value={}'.format(value))
f() # value=<random(1,10)>
f(None) # value=Nonecoalesce
Function returns first not ignoring value from iterable object. By default ignoring empty value
Example:
from coalesce import coalesce, empty
from random import randint
def f(value=empty):
value = coalesce([value, randint(1,10)])
print('value={}'.format(value))
f() # value=<random(1,10)>
f(None) # value=None
print coalesce([None, 1, 2], ignore=None, default=-7) # 1
print coalesce([None, None], ignore=None, default=-7) # -7first
Function returns first value from iterable for which the function(value) is truthful from iterable object. Else it returns default value
Example:
from coalesce import first
print first(lambda x: x > 1, [None, 1, 2], default=-7) # 2
print first(lambda x: x > 2, [None, 1, 2], default=-7) # -7Release history Release notifications | RSS feed
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