[GH-ISSUE #291] "PYTHON" UnboundLocalError: local variable 'a' referenced before assignment #196

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opened 2026-02-25 20:33:01 +03:00 by kerem · 0 comments

kerem commented

2026-02-25 20:33:01 +03:00

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Originally created by @AchailletBadigra on GitHub (Apr 6, 2018).
Original GitHub issue: https://github.com/asciinema/asciinema/issues/291

can anyone help me to fund the mistake inside my code please i have this error every time i try to execute the code searching part(4-search a book)

import time;
import pickle
localtime=time.asctime(time.localtime(time.time()))
bks=[]#-bks contain a list of books
bksid=[]#bksid contain a list of books identifiant
bksisn=[]#bksisn contain a list of international serial number
bksschl=[]#bksschl contain a list of school name
bkssts=[]#bkssts contain a list of books status
bksauthors=[]#bksauthors contain a list of books author
Return=[]#Return contain a list of Return books
brwname=[]#brwname contain a list of student name who have borrowed a books
brwsrn=[]#brwsrn contain a list of student serial number who have borrowed a books
belier=[]
def add_bks():

btitle=str(input("Enter book title:\n"))
bks.append(btitle)
belier.append(btitle)
bksthors=str(input("Enter book author name:\n"))
bksauthors.append(bksthors)
belier.append(bksthors)
bid=str(input("Enter book identifiant:\n"))
bksid.append(bid)
belier.append(bid)   
bisn=int(input("Enter book serial number:\n"))
bksisn.append(bisn)
belier.append(bisn)
bsts=str(input("Enter book status:\n"))
bkssts.append(bsts)
belier.append(bsts)
bschl=str(input("Enter school name of book:\n"))
bksschl.append(bschl)
belier.append(bksschl)

def borrow_bks():
print("borrow a book");
print("Borrowing date and heure:",localtime)
brwsnbook=int(input("Enter book serial number:\n"))
key1=brwsnbook
for i in range(len(bksisn)):
if key1==bksisn[i]:
pos1=(i)
for j in range(len(bkssts)):
if pos1==j:
sts=(bkssts[j])
if sts=="na":
print("The book is not there")
else:
name=str(input("Enter student name:\n"))
brwname.append(name)
srn=str(input("Enter student SRN:\n"))
brwsrn.append(srn)
for j in range(len(bkssts)):
pos1==j
bkssts[j]="na"

def Return_bks():
print("Return a book")
print("Returning date and heure:",localtime)
rtrsnbook=int(input("Enter book serial number:\n"))
key2=rtrsnbook
for i in range(len(bksisn)):
if key2==bksisn[i]:
pos2=(i)
for j in range(len(bkssts)):
if pos2==(j):
bkssts[j]="a"

tres=open("libra.txt","ab+")
pickle.dump(bks,tres)
pickle.dump(bksid,tres)
pickle.dump(bksisn,tres)
pickle.dump(bksschl,tres)
pickle.dump(bkssts,tres)
pickle.dump(bksauthors,tres)
tres.close()
tres=open("libra.txt","rb+")
bks1=pickle.load(tres)
bksid1=pickle.load(tres)
bksisn1=pickle.load(tres)
bksschl1=pickle.load(tres)
bkssts1=pickle.load(tres)
bksauthors1=pickle.load(tres)
tres.close()

def Menu():
print("\nLibrary menu options*\n",)
print(" 1-Add a book\n",
"2-Borrow a book\n",
"3-Return a book\n",
"4-Search a book")

def search_bks():

bookname=str(input("Enter a book title:\n"))
key=bookname
for a in range(len(bks1)):
    
    if key==bks1(a):
        ind1=(a) 
   
for  b in range(len(bksauthors1)):
    if ind1==b:
        ind2=(b)      
for c in range(len(bksschl1)):  
    if ind2==c:
        ind3=(c)
        
for d in range(len(bkssts1)):
    if ind3==d:
        cont=bkssts1(d)
    if cont=="a":          
        sss="Book available"
    else:       
        sss="Book not available"              
print("Book title:",bks1[a])
print("Book author:",bksauthors1[b])
print("Book school:",bksschl1[c])
print("Book statut:",sss)

def choice():
Menu()
ans=input("Do you want to select any option?:\n")
while (ans=="y"):
ch=int(input("Enter your choice please:\n"))
if ch==1:
add_bks()
if ch==2:
borrow_bks()
if ch==3:
Return_bks()
if ch==4:
search_bks()
ans=input("do you want to select any other option?:\n")
if ans=="n":
print("Thank you")

choice()

Originally created by @AchailletBadigra on GitHub (Apr 6, 2018). Original GitHub issue: https://github.com/asciinema/asciinema/issues/291 can anyone help me to fund the mistake inside my code please i have this error every time i try to execute the code searching part(4-search a book) import time; import pickle localtime=time.asctime(time.localtime(time.time())) bks=[]#-bks contain a list of books bksid=[]#bksid contain a list of books identifiant bksisn=[]#bksisn contain a list of international serial number bksschl=[]#bksschl contain a list of school name bkssts=[]#bkssts contain a list of books status bksauthors=[]#bksauthors contain a list of books author Return=[]#Return contain a list of Return books brwname=[]#brwname contain a list of student name who have borrowed a books brwsrn=[]#brwsrn contain a list of student serial number who have borrowed a books belier=[] def add_bks(): btitle=str(input("Enter book title:\n")) bks.append(btitle) belier.append(btitle) bksthors=str(input("Enter book author name:\n")) bksauthors.append(bksthors) belier.append(bksthors) bid=str(input("Enter book identifiant:\n")) bksid.append(bid) belier.append(bid) bisn=int(input("Enter book serial number:\n")) bksisn.append(bisn) belier.append(bisn) bsts=str(input("Enter book status:\n")) bkssts.append(bsts) belier.append(bsts) bschl=str(input("Enter school name of book:\n")) bksschl.append(bschl) belier.append(bksschl) def borrow_bks(): print("borrow a book"); print("Borrowing date and heure:",localtime) brwsnbook=int(input("Enter book serial number:\n")) key1=brwsnbook for i in range(len(bksisn)): if key1==bksisn[i]: pos1=(i) for j in range(len(bkssts)): if pos1==j: sts=(bkssts[j]) if sts=="na": print("The book is not there") else: name=str(input("Enter student name:\n")) brwname.append(name) srn=str(input("Enter student SRN:\n")) brwsrn.append(srn) for j in range(len(bkssts)): pos1==j bkssts[j]="na" def Return_bks(): print("Return a book") print("Returning date and heure:",localtime) rtrsnbook=int(input("Enter book serial number:\n")) key2=rtrsnbook for i in range(len(bksisn)): if key2==bksisn[i]: pos2=(i) for j in range(len(bkssts)): if pos2==(j): bkssts[j]="a" tres=open("libra.txt","ab+") pickle.dump(bks,tres) pickle.dump(bksid,tres) pickle.dump(bksisn,tres) pickle.dump(bksschl,tres) pickle.dump(bkssts,tres) pickle.dump(bksauthors,tres) tres.close() tres=open("libra.txt","rb+") bks1=pickle.load(tres) bksid1=pickle.load(tres) bksisn1=pickle.load(tres) bksschl1=pickle.load(tres) bkssts1=pickle.load(tres) bksauthors1=pickle.load(tres) tres.close() def Menu(): print("\n******Library menu options*******\n",) print(" 1-Add a book\n", "2-Borrow a book\n", "3-Return a book\n", "4-Search a book") def search_bks(): bookname=str(input("Enter a book title:\n")) key=bookname for a in range(len(bks1)): if key==bks1(a): ind1=(a) for b in range(len(bksauthors1)): if ind1==b: ind2=(b) for c in range(len(bksschl1)): if ind2==c: ind3=(c) for d in range(len(bkssts1)): if ind3==d: cont=bkssts1(d) if cont=="a": sss="Book available" else: sss="Book not available" print("Book title:",bks1[a]) print("Book author:",bksauthors1[b]) print("Book school:",bksschl1[c]) print("Book statut:",sss) def choice(): Menu() ans=input("Do you want to select any option?:\n") while (ans=="y"): ch=int(input("Enter your choice please:\n")) if ch==1: add_bks() if ch==2: borrow_bks() if ch==3: Return_bks() if ch==4: search_bks() ans=input("do you want to select any other option?:\n") if ans=="n": print("Thank you") choice()