查找Pandas dataFrame

Question

我通过读取文本文件创建了一个数据框.我很想知道特定列中是否存在少量值,如果它们存在,我想打印整行.

这是我的输入文件(analyte_map.txt):

Analyte_id    mass    Intensity   
A34579        101.2    786788
B12345        99.2     878787
B943470       103.89   986443
C12345        11.2      101

这是我的代码:

import pandas as pd
map_file="analyte_map.txt"
array=['A34579','B943470','D583730']
analyte_df=pd.read_table(map_file,sep="\t")
for value in array:
    if analyte_df.lookup([value],['Analyte_id']):
        print '%s\t%s'%(analyte_df['mass'],analyte_df['Intensity'])

Answer 1

你可以用boolean indexing与isin:

array=['A34579','B943470','D583730']
print (df[df.analyte_id.isin(array)])
  analyte_id    mass  Intensity
0     A34579  101.20     786788
2    B943470  103.89     986443

如果只需要一些列使用ix:

array=['A34579','B943470','D583730']
print (df.ix[df.analyte_id.isin(array), ['mass','Intensity']])
     mass  Intensity
0  101.20     786788
2  103.89     986443