[split] Creating a variable as a function

[ndc85430]

Not least because in reality, those function calls may be expensive or have some side effect somewhere (writing to a database for example) that you only really want to do when you need to.

[DPaul]

You prefer it like i implemented it in post # 1 ?

Paul

[buran]

it's not a matter of preference. the point is to NOT execute all functions while creating the dict

[DPaul]

Like so:

#the functions
def AAA():
    return 'AAA'

def BBB():
    return 'BBB'

def ELSE():
    return 'UNKNOWN'
# ---------------------------
#(1)single key dict with default
def switcher1(k):
    myDict = {100:AAA,200:BBB}
    return myDict.get(k, ELSE)

print(switcher1(200)())
print(switcher1(502)())
# -----------------------------
#(2)tuple with (optional) multiple keys and default
def switcher2(k):   
    myDict2 = {('a'):AAA, ('x', 'y', 'z'):BBB}
    myDict2 = {key:value for item, value in myDict2.items() for key in item}
    return myDict2.get(k, ELSE)

print(switcher2('z')())
print(switcher2('M')())
# --------------------------------
#(3) range dict with default
from range_key_dict import RangeKeyDict
 
def switcher3(k):
    myDict3 =  RangeKeyDict({(0,100): AAA,(101,200): BBB})
    return myDict3.get(k, ELSE)

print(switcher3(152)())
print(switcher3(5210)())

Paul