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from math import exp, expm1
import os
#define variables:
#define functions:
def get_number(one_line):
return one_line[:6]
def get_balance(one_line):
bal=float(one_line[7:17])
return bal
def get_name(one_line):
return one_line[18:]
def equal_floats(x_flt,y_flt):
equal=abs(x_flt-y_flt)
if equal < expm1(1e-8):
return True
else:
return False
#open the input & output files
file_str=input("Enter a file name: ")
filename_in=file_str+".old.txt"
filenew=file_str+".new.txt"
#deal with any file errors
try:
fi=open(filename_in,"r")
except IOError:
print("Input file cannot be opened...")
os._exit(1)
try:
fo=open(filenew,"w")
except IOError:
print("Output file cannot be opened...")
os._exit(1)
for one_line in fi:
account_nr = get_number(one_line)
if account_nr == "999999":
break
else:
name= get_name(one_line)
balance = float(get_balance(one_line))
while True:
print("Current Customer Information")
print("Account ",account_nr)
print("Balance $", balance)
print("Name ", name)
trans=input("Enter a command (a,c,d,w): ")#Prompt for transaction
if trans == "d":
deposit_in=input("Deposit amount: ")#prompt for deposit amount
try:
deposit=float(deposit_in)
if deposit < 0:
print("******Do not input negative numbers try again...******")
print("")
elif deposit+balance > 9999999.99:#check input for errors
print("******Can't Deposit that much******")
print("")
else:
balance = balance + deposit
except ValueError:
print("******Incorrect input, try again******")
print("")
elif trans == "w":
withdrawl_in=input("Withdrawl amount: ")#prompt for withdrawl amount
try:
withdrawl=float(withdrawl_in)
if withdrawl < 0:
print("******Do not input negative numbers try again...******")
print("")
elif withdrawl > balance: #check input for errors
print("******Can't withdraw that much******")
print("")
else:
balance = balance - withdrawl
except ValueError:
print("******Incorrect input, try again******")
print("")
elif trans == "a":
out_line=account_nr+" "+ str("{0:.2f}".format(balance)).rjust(10)+ " "+name
fo.write(out_line)
#go to next record
break
elif trans == "c":
if equal_floats(0,balance)==True:
print("******Account closed, moving on...******")#display invalid transaction error
print("")
break
else:
print("******Account not closed because money is still in it******")#display invalid transaction error
print("")
else:
print("******Invalid input try again******")
print("")
fo.write("999999")
fo.close()
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