import numpy as np                                                      # import the numpy module so we can do some real math, such as taking sine(x), this type of import allows us to call numpy ‘np’

try:                                                                    # one of the many elegant python features is the TRY block, which doesn’t crash the program if the program makes an error!

    savefilename = "sinedata.txt"                                       # make a string variable
    outfile = open(savefilename,'w')                                    # use a built-in function to open a file for writing (create if necessary)

    for x in np.linspace(0,7,100):                                      # ‘for loops’ cycle over a list, in this case a list of numbers generated by the numpy ‘linspace’ method, don’t forget the ‘:’
        outfile.write(str(x) + " " + str(np.sin(x)) + "\n")             # this string concatenation will be explained in class.  Note ‘write’ is a method of the ‘file’ class.

    outfile.close()                                                     # it is always good to clean things up (close the file), and to print out a few messages to tell us that things worked
    print(savefilename + " created")

except:
    print("Failure!")