def introduction():
print("")
print("Thank you for using Postage Calculator!")
print(
"It is more important than ever to stay in touch with loved ones during shelter-in-place."
)
print(
"We're here to help you determine how much it will cost to mail your item domestically."
)
exitable_input(
'Please follow these instructions, or type "exit" to leave at any time. (Hit enter to continue) '
)
def take_weight():
# prompt user for weight
print("")
str_weight = exitable_input(
"Please input the weight of your envelope in ounces. "
'(For example, if your envelope weighs 1.2 ounces, enter "1.2"): ')
# this will try to convert the entered in weight into a float.
try:
flt_weight = float(str_weight)
while flt_weight < 0: # if not a positive num, print message and ask for input again
print("Sorry, input must be a positive number, try again.")
# recursion
return take_weight()
# if it's a positive number, we can return the weight.
return flt_weight
# this produces a ValueError if user enters something that can't be converted to a float.
except ValueError:
print("")
print("Sorry, that's not a valid answer. Try again.")
# recursion to prompt user to enter a valid number.
return take_weight()
def check_large_envelope(item):
print("")
print('Is your envelope smaller than a LARGE-SIZED envelope? 🗂')
print('(A large-sized envelope is defined as 15" x 11.5".)')
size = exitable_input('Please enter "yes" or "no": ')
# this runs if it's small enough to be delivered as a large-envelope letter.
if size.lower() == "yes":
# set item type to 'large'
item['type'] = "large"
print("")
print(
'Great! It looks like you can mail your letter as a LARGE SIZED ENVELOPE. 😀️'
)
# this runs if it's too large to be delivered as a letter, and must be delivered as parcel.
elif size.lower() == "no":
# set item type to 'parcel'
item['type'] = "parcel"
print("")
print('Sorry, your package is too large to be mailed as a letter. 😭')
print(
'Please take it to your local USPS store and have it delivered as a parcel. 📦'
)
# catches input errors
elif not size.lower() == "yes" and not size.lower() == "no":
print("")
print("Sorry, that's not a valid answer. Try again.")
return check_large_envelope(item)
def get_envelope_type(item):
print("")
print(
"Is your envelope a STANDARD rectangle shape, or an IRREGULAR shape (for example, a square)?"
)
envelope_type = exitable_input('Please enter "standard" or "irregular": ')
if envelope_type.lower() == 'standard':
# check if the regular rectangle envelope contains items. Regular envelopes containing items have a surcharge.
items = has_items()
# this code runs if the envelope contains items. We set the item type to 'irregular'.
if items:
item['type'] = 'irregular'
print("")
print("Alright! You can mail your letter as an IRREGULAR item. 😀")
# otherwise, this code runs if there are no items and sets the item type as 'standard'.
elif not items:
item['type'] = 'standard'
print("")
print("Good news! You can mail your letter as a STANDARD item. 😀")
elif envelope_type.lower() == 'irregular':
# this sets item type as 'irregular'.
item['type'] = 'irregular'
print("")
print("Good news! You can mail your letter as a IRREGULAR item. 😀")
# catches input errors
elif not envelope_type.lower() == "standard" and not envelope_type.lower(
) == "irregular":
print("")
print("Sorry, that's not a valid answer. Try again.")
return get_envelope_type(item)
def check_postcard(item):
# create key 'type' for item and set it to an empty string
item['type'] = ""
print("")
print('Is your item a POSTCARD? 🗺')
print('(Postcards cannot be more than 6" in length and 4.25" in width.)')
size = exitable_input('Please enter "yes" or "no": ')
# this runs if the item is a postcard. Print the cost, what kinds of stamps to use, and where to purchase stamps
if size.lower() == "yes":
# update item type to postcard
item['type'] = "postcard"
print("")
print("The cost of mailing a postcard is $" + str(POSTCARD) + ".")
print("You can use 1 POSTCARD STAMP to mail this item.")
exitable_input(
"Don't have stamps? Support USPS by buying stamps here: "
"https://store.usps.com/store/results/stamps/postcard/_/N-9y93lvZ17vjvm6 (Hit enter to continue)"
)
# catches input errors
elif not size.lower() == "yes" and not size.lower() == "no":
print("")
print("Sorry, that's not a valid answer. Try again.")
return check_postcard(item)
def has_items():
print("")
print(
"Does your item contain items such as pens, pencils, or keys that make it IRREGULARLY SHAPED? 🖋"
)
answer = exitable_input('Please enter "yes" or "no": ')
if answer.lower() == "yes":
return True
elif answer.lower() == "no":
return False
elif not answer.lower() == "yes" and not answer.lower() == "no":
print("")
# catches input errors
print("Sorry, that's not a valid answer. Try again.")
return has_items()
def check_standard_envelope(item):
print("")
print(
'Is your envelope the same size/smaller than a regular, standard-sized envelope? 📨️'
)
print('(A regular, standard-sized envelope is defined as 11.5" x 6.125".)')
size = exitable_input('Please enter "yes" or "no": ')
# this runs if it's a regular sized envelope
if size.lower() == "yes":
# will set item type to "rectangle" or "irregular"
get_envelope_type(item)
# catches input errors
elif not size.lower() == "yes" and not size.lower() == "no":
print("")
print("Sorry, that's not a valid answer. Try again.")
return check_standard_envelope(item)