Python：将函数调用的列表索引作为它自己的参数传递

Question

I've got a rather sizable (3.9 kB) script that's designed to align some text based on some parameters, centering, etc. Here are the blocks I'm looking to improve: (Apologies for the somewhat-codegolf but the point is not what the functions do but their structure: they work fine as it is in theory but I ache to make them shorter)

    #manage + control the margin in spaces between the body text and right vertical rule
def calcMgn(lnNum): return toEven(bwinner-(len(LnOpn[lnNum])+len(LnCtn[lnNum])),-1)//2
def calcRMgn(lnNum): return (0-(1-(toEven(((bwinner-(len(LnOpn[lnNum])+len(LnCtn[lnNum])))//2),-1))))
def calcLenOf(lnNum): return len(LnMgn[lnNum])+len(LnOpn[lnNum])+len(LnCtn[lnNum])+calcRMgn(lnNum)
def calcRDiff(lnNum): return LnMgnR[lnNum] - (lenOf[lnNum] - bwinner)
def calcRMgnSpa(lnNum): return ((LnMgnRAdjust[lnNum])-adjust)
    #there absolutely must be a better way to call a function based on its position in a list than the following:
LnMgn=[calcMgn(0)*spa,calcMgn(1)*spa,calcMgn(2)*spa,calcMgn(3)*spa]
LnMgnR=[calcRMgn(0),calcRMgn(1),calcRMgn(2),calcRMgn(3)]
lenOf=[calcLenOf(0),calcLenOf(1),calcLenOf(2),calcLenOf(3)]
LnMgnRAdjust=[calcRDiff(0),calcRDiff(1),calcRDiff(2),calcRDiff(3)]
LnMgnR_spa=[calcRMgnSpa(0)*spa,calcRMgnSpa(1)*spa,calcRMgnSpa(2)*spa,calcRMgnSpa(3)*spa,]
    #take the lengths for a test drive to see if they break any rules
testLen=[LnMgn[0] + LnOpn[0] + spa + LnCtn[0] + LnMgnR_spa[0],\
LnMgn[1] + LnOpn[1] + spa + LnCtn[1] + LnMgnR_spa[1],\
LnMgn[2] + LnOpn[2] + spa + LnCtn[2] + LnMgnR_spa[2],\
LnMgn[3] + LnOpn[3] + spa + LnCtn[3] + LnMgnR_spa[3]] #instead of this, I want something like a for statement or ???
for i in range(0,3):
    if len(testLen[i]) > bwinner:
        LnMgnR_spa[i] = int((toEven(LnMgnRAdjust[i])-adjust)-(len(testLen[i])-bwinner))*str(spa)
    #concatenate strings
addLine=[idt + vl + LnMgn[0] + LnOpn[0] + spa + LnCtn[0] + LnMgnR_spa[0] + vr + nl,\
idt + vl + LnMgn[1] + LnOpn[1] + spa + LnCtn[1] + LnMgnR_spa[1] + vr + nl,\
idt + vl + LnMgn[2] + LnOpn[2] + spa + LnCtn[2] + LnMgnR_spa[2] + vr + nl,\
idt + vl + LnMgn[3] + LnOpn[3] + spa + LnCtn[3] + LnMgnR_spa[3] + vr + nl]

I know SO's policy of "we won't write your code for you" and I definitely don't intend to ask for such favours, just guidance: is there a way (and I have googled, and googled) to make LnMgn and its similar arrays more efficient and less huge by its contents dynamically iteravely calling and self-defining based on their array index?

Answer 1

You can also create a list of functions:

func_list = [f1, f2, f3, f4]

and call them, for example, like:

[func_list[i](i) for i in range(4)]

This example would return:

[f1(0), f2(1), f3(2), f4(3)]

Answer 2

Just use a list comprehension. One example:

LnMgn = [calcMgn(index)*spa for index in range(4)]

You can do the same for all the others.