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The issue above is that geng is being called with the arguments

n -c

each time. The value of n should be substituted in the string. Here is a working version of the for loop you have.

for n in range(3,7):
count = 0
for g in graphs.nauty_geng("{0} -c".format(n)):
    count += 1
print (n,count)

See here for more details on the format function.

Other possible variations on the call to geng above could also be:

graphs.nauty_geng("%d -c"%(n))

or

graphs.nauty_geng(str(n)+" -c")

The issue above is that geng is being called with the arguments

n -c

each time. The value of n should be substituted in the string. Here is a working version of the for loop you have.

for n in range(3,7):
 count = 0
 for g in graphs.nauty_geng("{0} -c".format(n)):
     count += 1
 print (n,count)

See here for more details on the format function.

Other possible variations on the call to geng above could also be:

graphs.nauty_geng("%d -c"%(n))

or

graphs.nauty_geng(str(n)+" -c")