How to fix "TypeError: unsupported operand type(s) for +: 'NoneType' and 'str'"?

Question

I am unsure why I am getting this error

count=int(input ("How many donuts do you have?"))
if count <= 10:
    print ("number of donuts: " ) +str(count)
else:
    print ("Number of donuts: many")

Asked By: user2101517

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Source

Answer 1

In python3, print is a function that returns None. So, the line:

print ("number of donuts: " ) +str(count)

you have None + str(count).

What you probably want is to use string formatting:

print ("Number of donuts: {}".format(count))

Answered By: mgilson

Answer 2

Your parenthesis is in the wrong spot:

print ("number of donuts: " ) +str(count)
                            ^

Move it here:

print ("number of donuts: " + str(count))
                                        ^

Or just use a comma:

print("number of donuts:", count)

Answered By: Blender

Answer 3

In Python 3 print is no longer a statement. You want to do,

print( "number of donuts: " + str(count) )

instead of adding to print() return value (which is None)

Answered By: Arcturus

Answer 4

Now, with python3, you can go with f-Strings like:

print(f"number of donuts: {count}")

Answered By: Jérémy

How to fix "TypeError: unsupported operand type(s) for +: 'NoneType' and 'str'"?

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