PY
py
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#defines a function with the name f taking the parameter n
def f(n):
#defines both variables x and y to be equal to 1.0
x=y=1.0
#starts a for loop that will run once for each integer 1 through n, but not for n
#since n is equal to 3 when the function is called later with print(f(3)), the loop with run for the integers 1 through 3, but not for 3
#TO SAY THE ABOVE IN A MORE SIMPLISTIC WAY: THE FOR LOOP WILL RUN TWICE: ONCE FOR THE INTEGER 1 AND ONCE FOR THE INTEGER 2. IT WILL NOT RUN FOR THE INTEGER 3.
for i in range (1,n):
#the code below will return true if x is equal to y and if y is equal to x+y. Since this is not true it will return false in he form of the number 0. 0 in python is also equal to false.
x,y==y,x+y
#after the for loop has finished running, this will return the value of y divided by x which will be a float. Since y is still equal to 1.0 and x is still equal to 1.0 the result is 1.0/1.0 = 1.0
return y/x
#prints the result, since 1.0 / 1.0 = 1.0 this will print 1.0
print(f(3))
#______________________________________________________
#note that in the line you question == is being used and = is not being used
#if = was used the code below would set the value of the variable x equal to y and the value of variable y equal to x+y
#if = was used instead the result would be 1.5 do to to following:
#x,y=y,x+y 1st iteration in for loop: x,y=1.0,1.0+1.0
#after the 1st iteration x is 1.0 y is 2.0
#x,y=y,x+y 2nd iteration in for loop: x,y=2.0,1.0+2.0
#now for the return y/x: return 3.0/2.0 = 1.5
#result is 1.5
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