Limit the length of an inputted string in python

Question

I am a complete beginner in Python and I'm trying to make improvements in my code for my GCSE Computer Science coursework. All I want to be able to do is limit the number of digits inputted to 7. Here is all of what I have so far:

print("Hello")
time.sleep(0.5)
print("What is your 7-digit product number?")
while True:
try:
    productnumber=  (str(int(input(" "))))
    break
except ValueError:
    print("Please only enter numbers")
    time.sleep(1)
    print()
    print("What is your 7-digit number?")

Any help is appreciated, I tried adding a nested loop but I've had no luck so far with anything I do, as I mentioned before, I am a compleeete beginner. Thanks a lot!

Please edit your post and add the exact/specific error you're observing. This will help others more easily help you. — xlm
– xlm, Commented Jan 14, 2017 at 22:59
@xlm Although I've already got my answer, I'll definitely do that, thanks for the feedback! — khushi
– khushi, Commented Jan 16, 2017 at 23:45

JoshOrndorff · Accepted Answer · 2017-01-14 20:42:21Z

2

Your code above is not indented properly because nothing is inside the infinite loop starting with while True:. I suspect just the try-except block is supposed to go in there. What you need to limit the entry to seven characters is an if. Consider the following:

while True:
  try:
    productnumber = str(int(input(" ")))
    if len(productnumber) > 7:
      print("You may only enter seven digits")
    else:
      break
  except ValueError:
    print("Please only enter numbers")
    time.sleep(1)
    print()
    print("What is your 7-digit number?")

The len functions computes the length of a string.

There are several other ways to make your code better including using camelCase for your variable names.

Happy python learning!

answered Jan 14, 2017 at 20:42

JoshOrndorff

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3 Comments

khushi Over a year ago

Thank you so much for your super fast reply, I really appreciate it! Also thanks for the advice, I incorporated your code into mine and it worked perfectly! Thank you so so much, you're an absolute life saver!

MattDMo Over a year ago

Read PEP-8. snake_case is recommended for method and variable names, not camelCase. This isn't JavaScript.

khushi Over a year ago

@MattDMo I see! Thank you very much for telling me!

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