案例1 转化数据类型
!git clone https://github.com/qiwsir/DataSet.git
!ls DataSet
加载数据集
import pandas as pd
import numpy as np
df = pd.read_csv(./DataSet/sales-data/sales_data_types.csv)
df
df.info()
help(df.astype)
Cast a pandas object to a specified dtype dtype.
# column.astype
df['Customer Number'].