SettingWithCopyWarning：试图在DataFrame的切片副本上设置一个值

Question

for i in range(0,len(donor_df)):
    if donor_df['cand_nm'][i] == 'Obama, Barack':
        donor_df['Party'] = 'Democrat'
    else:
        donor_df['Party'] = 'Republican'

donor_df是一个数据框，想要创建一个名为'party'的新列，但没有给出输出

Answer 1

您正在寻找def func1(i): return i + 1 def func2(j): return j + 2 def func3(k): return k + 3 class test: def __init__(self, one, two, three): self.one = one self.two = two self.three = three if __name__ == "__main__": obj = [] for i in range(10): if i !=3 and i != 7: value1 = func1(i) value2 = func2(i) value3 = func3(value2) one1 = value1 + value2 two1 = value1 + value2 + value3 three1 = value1 + value3 obj.append(test(one1, two1, three1))

np.where