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why i cant print sentence and variable value in 1 line use python?

Im try to calculating available subnet with python. just simple call but error.

    print ("the IP is valid")
    result = (2 ** (32 - int(mask)) - 2)
    print ("net available: ".format(result))
print ("the IP is valid")
result = (2 ** (32 - int(mask)) - 2)
print ("net avaiable: {0}".format(result))

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