在Pandas中使用Criteria切片数据

Question

我目前正在研究Kaggle's titanic数据集的train.csv。

我是python的新手。我想创建只包含女性的新DataFrame（忽略所有有女性的行）。我正在使用以下命令，但我收到错误：

你们中的任何人都可以看看吗？我遇到过类似的问题，但他们在我的案例中没有帮助......

谢谢，

Ajeet

Answer 1

括号错了。尝试

df[df.Sex == 'female']

Answer 2

你可以通过以下几种方式实现：

df = df[df['columnname'] =='whatever'] # keeps only rows that have that value in that column
df = df[df['columnname'] !='whatever'] # the opposite of before. keeps only those that do not have that value

df = df[df['columnname'].isin('whatever','whatever')] # if you want to use multiple values

df = df[~df['columnname'].isin('whatever','whatever')] # the opposite of before

df = df[df['columnname'] > 5] # works also like this

Answer 3

试试这个：

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