while True:
printing("Welcome to The Cheapest Dealer Ship\n", 0.025)
printing("What car would you like\n")
printing(
"""
(1) Standard $50
(2) SUV $60
(3) Minivan $80
""", 0.025)
ans = input(">>")
try:
int(ans)
except:
pass
if ans == 1:
Total += 50
Car = "Standard"
Car_cost = 50
break
elif ans == 2:
Total += 60
Car = "SUV"
Car_cost = 60
break
elif ans == 3:
Total += 80
Car = "Minivan"
Car_cost = 80
break
else:
printing("Please chose a valid option")
time.sleep(1)
replit.clear()
So basically this is a school code excersize but I can't quite figure why it will return with an else statement even if you answer 1,2 or 3. Not sure why int isn't working or what I'm doing wrong.
Either change your this line
int(ans)
To:-
ans = int(ans)
Or, you can directly take an integer as a input.
Change these lines of code
ans = input(">>")
try:
int(ans)
except:
pass
To this,
while True:
ans = (input(">>"))
if ans.isnumric():
while True:
if ans=="3" or ans=="2" or ans=="1"
break
else:
print("Please select any one (1\2\3)")
break
else:
print("Please enter only numbers.")
ans = int(ans)
After this you will have no need to use try and except statements and you will have less chances of getting errors.
I'm writing this script for an assignment so I'd appriciate being talked through it rather than simply being handed an answer. Basically I'm trying to convert feet to meters, meters to feet, and provide a sum of the total converted distance in both at the end. Without the [] indexes, It was working perfectly. The new part I've only just added and am struggling with is the [] indexes, and to be honest I'm having a hell of a time groking how they work. Anyways heres the code:
MAX = 256
switch = ""
feet = [0.0] * MAX
meters = [0.0] * MAX
feetpermeter = 3.28084
metersperfoot = 0.3048
sum_meters = 0
sum_feet = 0
def main():
selector()
def selector():
while True:
print("Is your measurement in meters or feet?")
switch = input("Or would you like to quit?")
if (switch == "feet" or switch == "Feet"):
ftm()
elif (switch == "meters" or switch == "Meters"):
mtf()
elif (switch == "quit" or switch == "Quit"):
end()
else:
print("Sorry, that wasn't one of the options.")
print("Lets try that again")
def mtf():
try:
meters[sum_meters] = float(input("Enter the number of meters. "))
feet[sum_feet] = meters * feetpermeter
print("That is", feet, "feet.")
main()
except:
print("Sorry, I didn't quite get that, lets try again.")
mtf()
def ftm():
try:
feet[sum_feet] = float(input("Enter the number of feet. "))
meters[sum_meters] = feet * metersperfoot
print("That is", meters, "meters.")
main()
except:
print("Sorry, I didn't quite get that, lets try again.")
ftm()
def end():
while True:
switch2 = input("Are you sure you want to quit(y/n)?")
if (switch2 == "y" or switch2 == "Y"):
print("you converted a total of ", sum(feet), "feet")
print("And", sum(meters), "meters.")
print("Bye!")
exit()
elif (switch2 == "n" or switch2 == "N"):
print("Ok, let's try that again.")
main()
else:
print("Sorry, that wasn't one of the options.")
print("Lets try that again")
main()
I did try having sum_feet + 1 and sum_meters + 1 after each result but that hadnt worked either.
You are not using the indexing in a proper way. For instance , look at the comments on your existing code:
def mtf():
try:
# Error 1. You stored all the inputs to index 0, as sum_meters is 0 always and its not incremented
# So, all the inputs are not recorded, only last one gets in index 0
meters[sum_meters] = float(input("Enter the number of meters. "))
# Error 2: You multiplied the whole list against the conversion parameter.
# Instead, you should multiply the value at current index
feet[sum_feet] = meters * feetpermeter
# This will print the whole list. Again use the current index here
print("That is", feet, "feet.")
main()
except:
print("Sorry, I didn't quite get that, lets try again.")
mtf()
A fixed version of your function will be like:
def mtf():
try:
# For modifying global variables in a function scope
global sum_meters
global sum_feet
meters[sum_meters] = float(input("Enter the number of meters. "))
feet[sum_feet] = meters[sum_meters] * feetpermeter
print(f"That is {feet[sum_feet]} feet.")
sum_meters += 1
sum_feet += 1
main()
except:
print("Sorry, I didn't quite get that, lets try again.")
mtf()
This fixes stands true for your other functions as well.
I also thought to give you another piece of advice, that you can use a good object oriented approach for such problems, which makes it simpler to implement. You can learn a lot about that, then you will feel more confident.
As an example, see the below code - which does almost same, but in a more crisp way.
class Converter:
FEET_PER_METER = 3.28084
METERS_PER_FOOT = 0.3048
def __init__(self):
self.feet_store = []
self.meter_store = []
self.curr_index = 0
self.menu_handlers = {
"feet": self.feet_to_meter,
"meters": self.meter_to_feet,
"quit": self.summary
}
def run_selection(self, selected):
#
selected = str.lower(selected)
if selected in self.menu_handlers:
# call the relevant function
return self.menu_handlers.get(selected)()
return False
def meter_to_feet(self):
meters_in = float(input("Enter the number of meters."))
to_feet = meters_in * self.FEET_PER_METER
self.meter_store.append(meters_in)
self.feet_store.append(to_feet)
print(f"In Feet : {to_feet}")
return to_feet
def feet_to_meter(self):
feet_in = float(input("Enter the number of feet."))
to_meters = feet_in * self.METERS_PER_FOOT
self.feet_store.append(feet_in)
self.meter_store.append(to_meters)
print(f"In Meters : {to_meters}")
return to_meters
def summary(self):
confirm = input("Are you sure you want to quit(y/n)?")
if confirm in ["y", "Y"]:
print("you converted a total of ", sum(self.feet_store), "feet")
print("And", sum(self.meter_store), "meters.")
print("Bye!")
exit()
else:
return False
def main():
converter = Converter()
while True:
choice = input("Is your measurement in meters or feet (meters/feet/quit)?")
converter.run_selection(choice)
I hope this gives you better insights.
So theres two problems with what you've tried to do here, in the lines:
meters[sum_meters] = float(input("Enter the number of meters. "))
feet[sum_feet] = meters * feetpermeter
meters * feetpermeter is multiplying an array by a number, you need to do meters[sum_meters] to get the number you want. Secondly as you said, you need to increment sum_meters each time, but because you're inside a function you will need to declare the variable as a global before you change it. Also since sum_meters and sum_feet are always going to be equal, you can just use a single variable to keep track of this:
def mtf():
try:
global index
meters[index] = float(input("Enter the number of meters. "))
feet[index] = meters[index] * feetpermeter
index += 1
print("That is", feet, "feet.")
main()
except:
print("Sorry, I didn't quite get that, lets try again.")
mtf()
def ftm():
try:
global index
feet[index] = float(input("Enter the number of feet. "))
meters[index] = feet * metersperfoot
index += 1
print("That is", meters, "meters.")
main()
except:
print("Sorry, I didn't quite get that, lets try again.")
ftm()
I would also go a little further and say that the use of lists is unnecessary for this problem, you could simply have two numbers, total_meters and total_feet and add the values as you go. This would take less memory and also remove the arbitrary limit of 256 goes that has been imposed. So I would do:
import sys
MAX = 256
switch = ""
total_feet = 0
total_meters = 0
feetpermeter = 3.28084
metersperfoot = 0.3048
sum_meters = 0
sum_feet = 0
index = 0
def main():
selector()
def selector():
while True:
print("Is your measurement in meters or feet?")
switch = input("Or would you like to quit?")
if switch == "feet" or switch == "Feet":
ftm()
elif switch == "meters" or switch == "Meters":
mtf()
elif switch == "quit" or switch == "Quit":
end()
sys.exit(0)
else:
print("Sorry, that wasn't one of the options.")
print("Lets try that again")
def mtf():
try:
global total_feet
global total_meters
meters = float(input("Enter the number of meters. "))
feet = meters * feetpermeter
total_meters += meters
total_feet += feet
print("That is", feet, "feet.")
main()
except Exception as e:
print(e)
print("Sorry, I didn't quite get that, lets try again.")
mtf()
def ftm():
try:
global total_feet
global total_meters
feet = float(input("Enter the number of feet. "))
meters = feet * metersperfoot
total_meters += meters
total_feet += feet
print("That is", meters, "meters.")
main()
except Exception as e:
print(e)
print("Sorry, I didn't quite get that, lets try again.")
ftm()
def end():
while True:
switch2 = input("Are you sure you want to quit(y/n)?")
if switch2 == "y" or switch2 == "Y":
print("you converted a total of ", total_feet, "feet")
print("And", total_meters, "meters.")
print("Bye!")
exit()
elif switch2 == "n" or switch2 == "N":
print("Ok, let's try that again.")
main()
else:
print("Sorry, that wasn't one of the options.")
print("Lets try that again")
main()
Hi i am albert i am learning python, in this block of code i wrote i intend it to print the total, but the input statements just keep going in a loop
print("this program prints your invoice")
while True:
ID = input("item identification: ")
if ID == "done":
break
if len(ID) < 3:
print("identification must be at least 3 characters long")
exit(1)
break
try:
Quantity = int(input("quantity sold: "))
except ValueError:
print("please enter an integer for quantity sold!!!")
exit(2)
if Quantity <= 0:
break
print("please enter an integer for quantity sold!!!")
exit(3)
try:
price = float(input("price of item"))
except ValueError:
print("please enter a float for price of item!!")
exit(4)
if price <= 0:
print("please enter a positive value for the price!!!")
exit(5)
break
cost = 0
total = cost + (Quantity*price)
print(total)
I think you need this
cost = 0
total = cost + (Quantity*price)
print(total)
to be inside the while loop. Else, skip the loop completely.
Try this:
print("This program prints your invoice")
total = 0
more_to_add = True
while more_to_add == True:
ID = input("Item identification: ")
if len(ID) < 3:
print("Identification must be at least 3 characters long")
continue
try:
Quantity = int(input("Quantity sold: "))
except ValueError:
print("Please enter an integer for quantity sold!!!")
continue
if Quantity <= 0:
print("Please enter an integer for quantity sold!!!")
continue
try:
price = float(input("Price of item: "))
except ValueError:
print("Please enter a float for price of item!!")
continue
if price <= 0:
print("Please enter a positive value for the price!!!")
continue
total = total + (Quantity*price)
answer = input("Want to add more? (Y/N)" )
if answer == 'Y':
more_to_add = True
else:
more_to_add = False
print(total)
I am creating a program where you will have to loop through multiple questions each with a condition. If user input for the question does not meet the requirement, it will print out the error and prompt user to re-enter. Else, it will continue with the next question. And not only prompting user to re-enter after all 3 questions are answered.
This it the output I am getting now:
while True:
amount = int(input("Enter amount: "))
rate = int(input("Enter rate: "))
year = float(input("Enter year: "))
if amount<4000:
print("Invalid amount")
continue
elif rate<0:
print("invalid rate")
continue
elif year<0:
print("invalid year")
break
Output:
Enter amount: 1
Enter rate: 3
Enter year: 4
Invalid amount
Enter amount:
Expected output:
Enter amount: 4
Invalid amount
Enter amount:
It's not very clear what are you trying to achieve, but I think you want this:
while True:
amount = int(input("Enter amount: "))
if amount < 4000:
print("Invalid amount")
continue
break
while True:
rate = int(input("Enter rate: "))
if rate < 0:
print("invalid rate")
continue
break
while True:
year = float(input("Enter year: "))
if year < 0:
print("invalid year")
continue
break
This will only ask to re-enter the invalid values.
Another more reusable method would be:
def loop_user_input(input_name, meets_condition):
while True:
value = int(input(f"Enter {input_name}: "))
if not meets_condition(value):
print(f"Invalid {input_name}")
else:
return value
loop_user_input('amount', lambda val: val < 4000)
loop_user_input('rate', lambda val: val < 0)
loop_user_input('year', lambda val: val < 0)
Here you have a loop that only returns when the input value meets the condition, that you pass in. I recommend you check your conditions, because a year normally shouldn't be negative (rate < 0). Also your solution throws an exception, if the user enters something else then an int. Maybe add a try-catch to your solution:
try:
value = int(input(f"Enter {input_name}: "))
except:
print(f"Invalid {input_name}")
continue
I am writing a simple program that executes if-else condition. my program receives from the user as input the weight of an object in kg. , a floating number, and print out the price for shipment. by using while I want to Expand the program to function and calculate the total price for multiple packages. The program should load packet weight until the user enters a blank line or a number that is 0 or less. The program will then print the total price for all the packages
the code looks like this:
def packagePrice():
weightInKg = float(input(" Enter the value of weight:"))
totalPrise = 0
while weightInKg != "" or weight <= 0:
if weightInKg <= 10:
price = 149
elif 10 < weightInKg <= 100:
price = 500
elif weightInKg > 100:
print ("Not allowed")
totalPrise+= price
print(totalPrise)
weightInKg = float(input(" Enter the value of weight:"))
packagePrice()
but it does not properly run
anyone help
Does this answer the question ?
def packagePrice():
totalPrise = 0
while True:
weightInKg = input(" Enter the value of weight:")
if weightInKg == '':
break
try:
weightInKg = float(weightInKg)
except ValueError:
print("Text not allowed")
continue
if weightInKg <= 0:
break
if weightInKg <= 10:
totalPrise += 149
elif weightInKg <= 100:
totalPrise += 500
else:
print("Not allowed")
return totalPrise
print(packagePrice())