Typeerror: unsupported operand type(s) for %: 'nonetype' and 'tuple'

Question

Problem :

I have recently started learning Python 3. I am beginner to the programming world. Please find below the code responsible for the error:

a = "I know the %d types of people." % 10
Integer = "integer"
do_not = "don't"
b = "Those type of people who know %s and those who %s" % (Integer, do_not)
print(a)
print(b)
print("I know: %r") % a

Is there any difference between the %r, %s and %d ?

I am often facing below error:

“Typeerror: unsupported operand type(s) for %: 'nonetype' and 'tuple'”.

Kindly guide me in fixing my above error?

Answer 1

I know I can help you in fixing above mentioned error. I guess you want to call your % outside of your print() function. Your function is trying to cross check if your actual function print is printed as %r and as your print is not returning anything so now it is trying to get the %r for your value None this is the main reason behind your NoneType error.

So you need to change it to:

print("I said: %r" %(a))

If you make changes to your code like the code below then it will work for you:

a = "Hello"
print ("Hello People! %s" %(a))

I hope it helps you.