Rounding with string homework

gistfile1.py

#Given a variable, x, that stores
#the value of any decimal number,
#write Python code that prints out
#the nearest whole number to x.

#You can assume x is not negative.

# x = 3.14159 -> 3 (not 3.0)
# x = 27.63 -> 28 (not 28.0)

x = 3.14159

#DO NOT USE IMPORT

#ENTER CODE BELOW HERE
#ANY CODE ABOVE WILL CAUSE
#HOMEWORK TO BE GRADED
#INCORRECT

def string_round(x):
    number = str(x)
    tenths = number[number.find('.') + 1][0]
    solved = (x + 5 +
              tenths.find('5') +
              tenths.find('6') +
              tenths.find('7') +
              tenths.find('8') +
              tenths.find('9'))
    print str(solved)[:str(solved).find('.')]

string_round(x)