Having trouble getting selection 7 and 8 to write/ read files. Can anyone see what's wrong? They are performing math functions not write/read functions

#code

from mylib import mylib

def IsInRange(low_range,high_range,number):

if number>=low_range and number<=high_range:

return True

else:

return False

def Menu():

print("Select Operation.")

print("1.Addition")

print("2.Subtraction")

print("3.Multiply")

print("4.Divide")

print("5.scalc")

print("6.All in one")

print("7.Write to File")

print("8.Read from the file")

print(" ")

def main():

obj = mylib()

Menu()

choice = input("Enter choice(1/2/3/4/5/6/7/8 or q):")

try:

low_range = int(input("lower range variable"))

high_range= int(input("higher range variable"))

var1 = int(input("first variable"))

while not IsInRange(low_range, high_range, var1):

var1=int(input("Re-Enter first variable"))

var2=int(input("Enter your second variable"))

while not IsInRange(low_range, high_range, var2):

var2=int(input("Re-Enter your second variable in the range"))

except ValueError:

print('please use integers')

return

operation = str(input("Enter problem string like this, N1,N2,and Operator, "))

try:

if choice == '1':

print("the sum of", var1, "+", var2, "=", obj.addition(var1, var2))

elif choice == '2':

print("the difference of:", var1, "-", var2, "=", obj.subtraction(var1, var2))

elif choice == '3':

print("the product of:", var1, "*", var2, "=", obj.multiplication(var1, var2))

elif choice == '4':

print("the quotient of:", var1, "/", var2, "=", obj.division(var1, var2))

elif choice == '5':

print(obj.scalc(operation))

elif choice == '6':

print(obj.allInOne(var1,var2))

elif var1 >= low_range and var2 <= high_range:

print("the sum of", var1, "+", var2, "=", obj.addition(var1, var2))

print("the difference of", var1, "-", var2, "=", obj.subtraction(var1, var2))

print("the product of", var1, "*", var2, "=", obj.multiplication(var1, var2))

print("the quotient of", var1, "/", var2, "=", obj.division(var1, var2))

print(obj.scalc(operation))

print(obj.allInOne(var1,var2))

elif choice == 7:

wrFile = wrfile()

wrFile.write(self.allInOne())

elif choice == 8:

wrFile = wrfile()

wrFile.read()

else:

print(IsInRange(low_range, high_range,int))

except ZeroDivisionError:

print("You cannot divide by zero!!")

restart = input("Would like to try again? y for yes!")

if restart == "y" :

main()

else:

print("Thank you for using the calculator.")

return

main()

#mylib

class mylib:

def addition(self, var1, var2):

return var1 + var2

def subtraction(self, var1, var2):

return var1 - var2

def division(self, var1, var2):

if var1 == 0 or var2 == 0:

raise ZeroDivisionError

return var1 / var2

def multiplication(self, var1, var2):

return var1 * var2

def scalc(self, p1):

istring = p1.split(",")

res = 0

if istring[2] == "+":

res = self.addition(int(istring[0]), int(istring[1]))

elif istring[2] == "-":

res = self.subtraction(int(istring[0]), int(istring[1]))

elif istring[2] == "*":

res = self.multiplication(int(istring[0]), int(istring[1]))

elif istring[2] == "/":

res = self.division(int(istring[0]), int(istring[1]))

return res

def allInOne(self, var1, var2):

result1 = self.addition(var1, var2)

print("{0}+{1}={2}".format(var1, var2, result1))

result2 = self.subtraction(var1, var2)

print("{0}-{1}={2}".format(var1, var2, result2))

result3 = self.multiplication(var1, var2)

print("{0}*{1}={2}".format(var1, var2, result3))

result4 = self.division(var1, var2)

print("{0}/{1}={2}".format(var1, var2, result4))

return {

"addition": result1,

"subtraction": result2,

"multiplication": result3,

"division": result4,

}

class wrfile():

def __init__(self):

self.filename = 'output.txt'

def read(self):

try:

file = open(self.filename, 'r')

except:

print('File does not exist')

return

print(file.read())

def write(self, output):

file = open(self.filename, 'a')

file.write(str(output) + " ")

print('Output Written to the file