pandas 循环遍历一列熊猫时获取索引
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Get index when looping through one column of pandas
提问by Jeff Saltfist
I have a simple dataframe:
我有一个简单的数据框：
index, a, y 0 , 1, 2 1 , 4, 6 2 , 5, 8
索引, a, y 0 , 1, 2 1 , 4, 6 2 , 5, 8
I want to loop through the "a" column, and print out its index for a specific value.
我想遍历“a”列，并打印出特定值的索引。
for x in df.a:
if x == 4:
print ("Index of that row")
What syntax should I use to obtain the index value when the for loop hits the specific value in the "a" column that I am seeking?
当 for 循环遇到我正在寻找的“a”列中的特定值时，我应该使用什么语法来获取索引值？
Thank You
谢谢你
回答by ayhan
A series is like a dictionary, so you can use the .iteritemsmethod:
一个系列就像一本字典，所以你可以使用这个.iteritems方法：
for idx, x in df['a'].iteritems():
if x==4:
print('Index of that row: {}'.format(idx))
回答by Demetri Pananos
Use
用
df[df.a==4].index.values
to get an array of those indices
获取这些索引的数组
