TypeError, using a number to calculate in print

Question

How can I make this line work? print('Average state population:', totalPop/50)

it won't let me because the 50 is an int.

def main ():
file = open ('StateCensus2010.txt', 'r')
name = file.readline()
abb = file.readline()
pop = file.readline()
minPop = pop
minName = name
maxPop = pop
maxName = name
totalPop = pop
totalPop += pop   
for state in range (49):
    name = file.readline()
    abb = file.readline()
    pop = file.readline()
    if pop < minPop:
        minPop = pop
        minName = name
    if pop > maxPop:
        maxPop = pop
        minName = name
print(' State with MAX population:',maxName, maxPop)
print('State with MIN population:', minName, minPop)
print('Average state population:', totalPop/50)

That works fine when `totalPop` is an integer. Please post the actual error message including the full traceback. — kindall, Mar 27 '17 at 22:34
TypeError: unsupported operand type(s) for /: 'str' and 'int' is the traceback. just included the full code — Tania L, Mar 27 '17 at 22:37
How should I set it up to where the totalPop can be divisible by a number? — Tania L, Mar 27 '17 at 22:41

score 0 · Answer 1 · answered Mar 27 '17 at 22:33

0

You should use either print('Average state population: {}'.format(totalPop/50)) or print('Average state population:', str(totalPop/50)), but preferably the first. This uses string formatting which automatically converts types to strings.

answered Mar 27 '17 at 22:33

DW42

101
7

still get the trace back error "TypeError: unsupported operand type(s) for /: 'str' and 'int'" ): – Tania L Mar 27 '17 at 22:37
That would be because `totalPop` is a string. Convert it to an int (perhaps using `int`) before performing the division. – DW42 Mar 27 '17 at 22:38
@DW42 it needs to be converted far earlier than that, as do all the strings representing numbers. – Peter Wood Mar 27 '17 at 22:39
yeah, I just don't know where to convert it or if there's another way to do it. – Tania L Mar 27 '17 at 22:42
You could do something like `print('Average state population: {}'.format(int(totalPop)/50))`. – DW42 Mar 27 '17 at 22:47
No good : ValueError: invalid literal for int() with base 10: '4802982\n4802982\n' ): – Tania L Mar 27 '17 at 22:54
I think you need to look at how you're getting the populations... – DW42 Mar 28 '17 at 00:30

TypeError, using a number to calculate in print

1 Answers1