url notdefine是爲什麼？前兩天運行還沒錯

df = pd.read_csv(URL, header=None, names=header_list, sep=’\s+’) # try ‘\t’ df.head() NameError Traceback (most recent call last) in () 4 ‘k_width’, ‘asymmetry’, ‘g_length’, ‘k_class’ 5 ] ----> 6 df =

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