"df['Good Quality'] = [1 if x>=7 0 for x in df['quality']]“和下面给出的扩展行有什么不同？

Question

它们之间的区别是什么

df['Good Quality'] = [1 if x>=7 else 0 for x in df['quality']]

和

for x in df['quality']:
    if x>=7:
        df['Good Quality'] = 1
    else:
        df['Good Quality'] = 0

如果我使用第二个，x>=7的数据帧不会改变？这里发生的逻辑错误是什么？

Answer 1

您需要在pythonic风格的语法中提到for循环

for x in df['quality']:
    if x>=7:
        df['Good Quality'] = 1
    else:
        df['Good Quality'] = 0

编辑:我忘记了列表结果

result = []
for x in df['quality']:
    if x>=7:
         result.append(1)
    else:
         result.append(0)

df['Good Quality'] = result

您可以对此进行测试。