CODEWITHSUNDEEP
python-2.7
Fardin
Fardin

Reputation: 29

Operation on data read from a file

The following operation returns -0.20 which is fine: 

a=[1.,5]
x=a[0]
y=a[1]
z=(-1*x)/(x*y)
print ("{0:.2f}".format(z))

However, as soon as I read the same data from a file it doesn't work. Why?
TypeError: unsupported operand type(s) for /: 'str' and 'str' 

my_file=open("tmp.txt")  
for lines in my_file:  
    x=lines.split()  
    x0=x[0]  
    x1=x[1]  
print x0,x1  
y=(-1*x1)/(x0+x1)

Upvotes: 0

Views: 22

Answers (1)

yinnonsanders
yinnonsanders

Reputation: 1871

You have to cast the variables to integers:

x0 = int(x[0])
x1 = int(x[1])

In addition, the loop resets the variables x0 and x1 each loop, so the value of y will be based only on the last line.

Upvotes: 1

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