Вычисляем баланс счетов, сортируем по сумме

from sys import argv
check = argv[1]
a = open("bank.txt", "r", encoding="utf8").readlines()
listcheck = []
for x in a:
    if not x[:x.find(";")] in listcheck:
        listcheck.append(x[:x.find(";")])
    if not x[x.find(";") + 1:x.find(";", x.find(";") + 1)] in listcheck:
        listcheck.append(x[x.find(";") + 1:x.find(";", x.find(";") + 1)])
#print(listcheck)
summ = 0
out = []
for y in listcheck:
    if y == "000":
        continue
    for x in a:
        endout = x.find(";")
        endinc = x.find(";", endout + 1)
 
        outcome = x[:endout]
        income = x[endout + 1:endinc]
        money = x[endinc + 1:]
        if y == outcome:
            summ -= int(money)
        if y == income:
            summ += int(money)
    out.append(str(y) + " " + str(summ))
    summ = 0
print(out)
 
q = 1
minn = "999 99999999"
outsort = []
while q <= len(out):
    for i, x in enumerate(out):
        if int(minn[4:]) > int(x[4:]):
            minn = x
    outsort.append(minn)
    q += 1
 
print(outsort)

def balans(fprov):
    res={}
    with open(fprov,"r") as fi:
        for line in fi:
            (c_from,c_to,summ)=map(int,line.split(";"))
            if res.get(c_from) is None:
                res[c_from]=0
            if res.get(c_to) is None:
                res[c_to]=0
            res[c_from]=res[c_from]-summ
            res[c_to]=res[c_to]+summ
    
    tmp=[]        
    for count in res.keys():
        if count != 0:
            tmp.append((count,res[count]))
    tmp.sort(key=lambda pair: pair[1])        
    
    strout=""
    for pair in tmp:
        strout=strout+str(pair[0])+" "+str(pair[1])+";"
    ls=len(strout)
    return strout[0:ls-1]
 
print(balans("prov.txt"))

def balans(fprov):
    res={}
    with open(fprov,"r") as fi:
        for line in fi:
            (c_from,c_to,summ)=map(int,line.split(";"))
            if res.get(c_from) is None:
                res[c_from]=0
            if res.get(c_to) is None:
                res[c_to]=0
            res[c_from]=res[c_from]-summ
            res[c_to]=res[c_to]+summ
    
    tmp=[]        
    for count in res.keys():
        if count != 0:
            tmp.append((count,res[count]))
            
    #tmp.sort(key=lambda pair: pair[1])        
    
    n=len(tmp)
    for i in range(n-1):
        for j in range(i+1,n):
            if tmp[i][1]>tmp[j][1]:
                tmp[i],tmp[j]=tmp[j],tmp[i]
 
    strout=""
    for pair in tmp:
        strout=strout+str(pair[0])+" "+str(pair[1])+";"
    ls=len(strout)
    return strout[0:ls-1]
 
print(balans("prov.txt"))

out = ['123 -700', '456 -300', '789 -200']
outsort = []
while len(out):
    minn = '999 9999'
    for i in range(len(out)):
        if int(minn[4:]) > int(out[i][4:]):
            minn = out[i]
            i_minn = i
    outsort.append(minn)
    del out[i_minn]
    print(out)
 
print(outsort)