Python gives error if I run this code from cmd, however runs fine if I run it from Jupyter

Question

My code:

Basically, I am reading in inputs in a list. It should give an error if its not an integer, and skip that input and stop when i write "done". Then I am creating a count, sum and average, which I print.

total = 0
count = 0
list = []

while True:
    num = input("Enter a number: ")
    if num == "done":
        break
    try:
        fnum = float(num)
        list.append(fnum)
    except:
        print("Invalid input")
        print(fnum, type(fnum))
        continue
print(list)
for i in list:
    count += 1
    total += i
print(total, count, "Average: ", total/count)

Error message

Like I said, it runs fine from Jupyter or Colab, but I get the following error message from cmd:

If I enter a random string:

Traceback (most recent call last):
  File "C:location\file.py", line 6, in <module>
    num = input("Enter a number: ")
  File "<string>", line 1, in <module>
NameError: name 'asd' is not defined

If I enter done:

Traceback (most recent call last):
  File "C:location\file.py", line 6, in <module>
    num = input("Enter a number: ")
  File "<string>", line 1, in <module>
NameError: name 'done' is not defined

Answer 1

Probably you're running it using Python 2. Jupyter uses Python 3, so no problem. However in python2 the input() function takes an input and executes it as code . You entered asd - and python complains there is no asd variable (same for done ). Run it using python 3, or use the raw_input() function which has the same effect like input() in python 3 - but in python 2 (ie no running code).

Edit:

Assuming you're using python filename.py to run your code - try python -V . I'll give you the python version. If I correct, most of the time you can access python3 using python3 instead of just python .