Files

- main.py

main.py

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```
# input with validation as a function
def ask(question):
answer = input(question)
try:
answer = int(answer)
if answer < 0:
print("Numbers entered must be positive.")
return answer
except:
print("The input must be a valid number.")
return -1
#Check for repeated digits
def repeated_digits(num_int):
# put the digits from the number into a list
num_list = list(str(num_int))
# iterate through the list
for digit in num_list:
# count whether the digit appears more than once
if num_list.count(digit) > 1:
return True
return False
start = finish = -1
# No negative numbers
while start < 0:
start = ask("First year in range: ")
# The end of the range can't be before the start
while finish < start:
# the end of the range can't be before the start
finish = ask("Last year in range: ")
if finish < start:
print("The last year can't be earlier than the first one.")
# Loop through the range of years
repeated = 0
# loop through the years counting if digits repeated
for yr in range(start, finish+1):
repeated += repeated_digits(yr)
# Display the results with correct grammar
verb = ("are","is")
print("There",verb[repeated == 1],repeated,"year"+"s"*(repeated != 1),"in the range",start,"-",finish,"that contain"+"s"*(repeated == 1),"repeated digits.")
```