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| def do_something(filename = "", column1 = np.zeros(0), column2 = np.zeros(0), column3 = np.zeros(0)):
data1, data2, data3 = np.loadtxt(filename, unpack=True)
# Do something on data1, data2, data3 #
column1 = data1
column2 = data2
column3 = data3
print column1 # OK
print column2 # OK
print column3 # OK
return
column1 = np.zeros(0)
column2 = np.zeros(0)
column3 = np.zeros(0)
do_something(myfile, column1, column2, column3)
print column1 # EMPTY
print column2 # EMPTY
print column3 # EMPTY |
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