how to create a list of lists

Question

My Python code generates a list everytime it loops:

list = np.genfromtxt(\'temp.txt\', usecols=3, dtype=[(\'floatname\',\'float\')], skip_header=1)
         


        

Answer 1

Use append method, eg:

lst = []
line = np.genfromtxt('temp.txt', usecols=3, dtype=[('floatname','float')], skip_header=1)
lst.append(line)