It's because nothing happens after you enter the amounts. See here from the first if block. You call main() but then you've got nothing following it to ever print because where you print your total is in an else.
if m == "a":
a_t = eval(input("How many ? "))
a_p = apple * a_t
total = a_p + total
main() # nothing happens after this, it cannot enter the `else` block
else:
total = str(total)
print("You've purchased " + total + " dollar from our shop
Have a nice day !!!")
You're trying to do this recursively and although that can work you're probably better off with a while loop
Example for clarity:
total = 0
product = None
while product != "e":
m = input("Which fruit u want to purchase?
press < a > for apple
press < o > for orange
press < b > for banana
press e for exit: ")
number = eval(input("How many ? "))
if m == "a":
p = apple * number
elif m == "o":
p = orange * number
total += p
product = m # when this is "e" it will break the while loop
print("You've purchased " + total + " dollar from our shop
Have a nice day !!!") # will print after the while loop has finished
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