泰坦尼克号

import pandas
titanic = pandas.read_csv("titanic_train.csv") # 读取数据
# titanic.head()
print titanic.describe() # 每一列的统计

从上图中可以看到，age字段有缺少值，可以用平均值进行填充
titanic["Age"] = titanic["Age"].fillna(titanic["Age"].median())
print titanic.describe()

将male转换成可以计算的int值，并赋值为0
print titanic["Sex"].unique()

titanic.loc[titanic["Sex"] == "male","Sex"] = 0
titanic.loc[titanic["Sex"] == "female","Sex"] = 1

print titanic["Embarked"].unique()

titanic["Embarked"] = titanic["Embarked"].fillna(‘S‘)
titanic.loc[titanic["Embarked"] == "S","Embarked"] = 0
titanic.loc[titanic["Embarked"] == "C","Embarked"] = 1
titanic.loc[titanic["Embarked"] == "Q","Embarked"] = 2