Pandas入门(1):Series和Dataframe方法
1.将列表转换成列:Series方法
import pandas as pd a = [1, 2, 3] myvar = pd.Series(a) print(myvar)
输出结果如下:
1)指定索引值
import pandas as pd a = ["Google", "Runoob", "Wiki"] myvar = pd.Series(a, index = ["x", "y", "z"]) print(myvar)
输出结果如下:
x Google y Runoob z Wiki dtype: object
2)读取列的数据
import pandas as pd a = [1, 2, 3] myvar = pd.Series(a) print(myvar[1])
输出结果如下:
2
2.Dataframe将数据转换为表格
(1)import pandas as pd
     data = [[Google,10],[Runoob,12],[Wiki,13]]
     df = pd.DataFrame(data,columns=[Site,Age])  #columns指定列名
     print(df)
(2)import pandas as pd
     data = {
         "calories": [420, 380, 390],
         "duration": [50, 40, 45]
      }
     # 数据载入到 DataFrame 对象
     df = pd.DataFrame(data)
     print(df)
     # 返回第一行和第二行
     print(df.loc[[0, 1]]) 
输出结果如下:
(1)      Site  Age
      0  Google   10
      1  Runoob   12
      2    Wiki   13
(2)   calories  duration
0       420        50
1       380        40
2       390        45
   calories  duration
0       420        50
1       380        40
				       
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