我想根据import imageio
import os
path = '/Users/myusername/Desktop/Pics/' # on Mac: right click on a folder, hold down option, and click "copy as pathname"
image_folder = os.fsencode(path)
filenames = []
for file in os.listdir(image_folder):
filename = os.fsdecode(file)
if filename.endswith( ('.jpeg', '.png', '.gif') ):
filenames.append(filename)
filenames.sort() # this iteration technique has no built in order, so sort the frames
images = list(map(lambda filename: imageio.imread(filename), filenames))
imageio.mimsave(os.path.join('movie.gif'), images, duration = 0.04) # modify duration as needed
中的值，列df是否包含值{{1}，来过滤ref列下面的DataFrame ref }。
type在此，'P'的值1、3和4在列In [32]: df
Out[32]:
ref type
0 1 P
1 1 C
2 1 A
3 2 C
4 3 P
5 3 P
6 4 P
7 4 A
8 5 C
9 5 A
中包含至少一行，值ref，而2和5则不行
我试图用'P' 2和5过滤掉任何行，以便最终输出为：
type我该怎么做（最好一步一步）？
答案 0 :(得分：2)
使用groupby和filter：
df.groupby('ref').filter(lambda x : ('P' in x['type'].values))
返回：
ref type
0 1 P
1 1 C
2 1 A
4 3 P
5 3 P
6 4 P
7 4 A