Python---read image (glob read list of image files)

Common ways of reading pictures in deep learning:

globe

Use it to find file pathnames that match certain rules. Only three matching characters are used to find files: "*", "?", "[]";

"*" matches 0 or more characters;

"?" matches a single character;

"[]" matches characters within the specified range, such as: [0-9] matches numbers;

glob.glob

Returns a list of all matching file paths. It has only one parameter pathname, which defines the file path matching rule, which can be an absolute path or a relative path.

import glob

#Get all pictures in the specified directory
print glob.glob(r"E:/Picture/*/*.jpg")

#Get all .py files in the parent directory
print glob.glob(r'../*.py') #relative path

glob.iglob

Gets a calendarable object that can be used to get matching file pathnames one by one. The difference from glob.glob() is: glob.glob gets all matching paths at the same time, while glob.iglob gets only one matching path at a time.

import glob

#.py file in parent directory
f = glob.iglob(r'../*.py')

print f #<generator object iglob at 0x00B9FF80>

for py in f:
    print py

Get a list of all jpg image files in the images/training folder:

import them
import glob
image_dir = r"C:\Users\Administrator\Desktop";
file_glob = os.path.join(image_dir,"images","training","*."+"jpg")
print(file_glob)
file_list = []
file_list.extend(glob.glob(file_glob))
print(file_list)

结果如下：
C:\Users\Administrator\Desktop\images\training\*.jpg
['C:\\Users\\Administrator\\Desktop\\images\\training\\TJ_3.JPG', 'C:\\Users\\Ad
ministrator\\Desktop\\images\\training\\TJ_S.JPG']

Notes:

file_glob corresponds to the rules of *.jpg under the C:\Users\Administrator\Desktop\images\training\ path;

glob.glob(file_glob) returns all jpg image path names that meet the rules;