Loop over list entries

For-loop in Python:
for i in range(start,stop,inc):
    ...
for j in range(stop):
    ...
generates
i = start, start+inc, start+2*inc, ..., stop-1
j = 0, 1, 2, ..., stop-1
Loop over (x,y) values:
ofile = open(outfilename, 'w') # open for writing

for i in range(len(x)):
    fy = myfunc(y[i])  # transform y value
    ofile.write('%g  %12.5e\n' % (x[i], fy))

ofile.close()

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