如果要遍历DataFrame以对每行执行一些操作,则可以在Pandas中使用iterrows()函数。Pandas使用三个函数来迭代DataFrame的行,即iterrows(),iteritems()和itertuples()。
iterrows()负责遍历DataFrame的每一行。它返回一个迭代器,该迭代器包含作为Series的每一行的索引和数据。
此函数返回每个索引值以及包含每一行数据的序列。
import pandas as pd import numpy as np info = pd.DataFrame(np.random.randn(4,2),columns = ['col1','col2']) for row_index,row in info.iterrows(): print (row_index,row)
输出
0 name John degree B.Tech score 90 Name: 0, dtype: object 1 name Learnfk degree B.Com score 40 Name: 1, dtype: object 2 name Alexander degree M.Com score 80 Name: 2, dtype: object 3 name William degree M.Tech score 98 Name: 3, dtype: object
# importing pandas module import pandas as pd # 从csv文件制作数据框 data = pd.read_csv("aa.csv") for i, j in data.iterrows(): print(i, j) print()
输出
0 Name Hire Date Salary Leaves Remaining 0 John Idle 03/15/14 50... Name: 0, dtype: object 1 Name Hire Date Salary Leaves Remaining 1 Learnfk Gilliam 06/01/15 65000... Name: 1, dtype: object 2 Name Hire Date Salary Leaves Remaining 2 Parker Chapman 05/12/14 45000.0 ... Name: 2, dtype: object 3 Name Hire Date Salary Leaves Remaining 3 Jones Palin 11/01/13 700... Name: 3, dtype: object 4 Name Hire Date Salary Leaves Remaining 4 Terry Gilliam 08/12/14 4800... Name: 4, dtype: object 5 Name Hire Date Salary Leaves Remaining 5 Michael Palin 05/23/13 66000... Name: 5, dtype: object
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