如何使用 s3 中的 boto3 獲取上次修改的文件名

Question

我想從 amazon s3 的目錄中獲取最后修改的文件。 我現在只嘗試打印那個文件日期，但我收到了這個錯誤。

TypeError：'datetime.datetime' 對象不可迭代

import boto3
s3 = boto3.resource('s3',aws_access_key_id='demo', aws_secret_access_key='demo')

my_bucket = s3.Bucket('demo')

for file in my_bucket.objects.all():
    # print(file.key)
    print(max(file.last_modified))

Answer 1

那里有一個簡單的片段。 簡而言之，您必須遍歷文件以查找所有文件中的最后修改日期。 然后你有這個日期的打印文件（可能不止一個）。

from datetime import datetime

import boto3

s3 = boto3.resource('s3',aws_access_key_id='demo', aws_secret_access_key='demo')

my_bucket = s3.Bucket('demo')

last_modified_date = datetime(1939, 9, 1).replace(tzinfo=None)
for file in my_bucket.objects.all():
    file_date = file.last_modified.replace(tzinfo=None)
    if last_modified_date < file_date:
        last_modified_date = file_date

print(last_modified_date)

# you can have more than one file with this date, so you must iterate again
for file in my_bucket.objects.all():
    if file.last_modified.replace(tzinfo=None) == last_modified_date:
        print(file.key)
        print(last_modified_date)

Answer 2

您將使用 s3 中的 boto3 獲得最后修改的文件名和文件夾名稱

功能工具和 reduce 的參考 -鏈接

from functools import reduce
import boto3
# replace with your access key and secret key

#s3 = boto3.resource('s3', aws_access_key_id='demo', aws_secret_access_key='demo')

import boto3
s3_client = boto3.client('s3', aws_access_key_id='demo', aws_secret_access_key='demo')
response = s3_client.list_objects_v2(Bucket='bucket_name', Prefix='subfolder name')
#Replace with your bucket name and subfolder name
all = response['Contents']        
latest = max(all, key=lambda x: x['LastModified'])
print(latest)
#print(latest.values())
list(reduce(lambda x, y: x + y, latest.items()))
a = list(reduce(lambda x, y: x + y, latest.items()))
print(a[1])

輸出

# if you have one sub folder, you will get output in this below format
subfolder/filename.format
# if you having more than one sub folders, you will get output in this below format
subfolder1/subfolder2/filename.format

您需要根據您的存儲桶名稱獲取最后修改的文件夾和文件名

然后參考以下更改

#instead of this code
response = s3_client.list_objects_v2(Bucket='bucket_name', Prefix='subfolder name')
#remove prefix and subfolder name
response = s3_client.list_objects_v2(Bucket='bucket_name') 
#Replace with you bucket name