[Python] Are file handles in Python copied when added to a list? Is there a better way to...

I'm working on posting a number of images to Bluesky based on conditions. I want to make sure, all files are closed after using them but I'm unclear on how variables behave and what is the best way to handle things.

My basic structure is like this:

images = []
captions = []

if condition1:
file1 = open('file1.png', 'rb')
images.append(file1)
captions.append('file 1')

if condition2:
file2 = open('file2.png', 'rb')
images.append(file2)
captions.append('file 2')

bluesky.send_images('Image post', images, captions)


Questions:

• 
  When I append file1, file2, ... to images, are they copied or referenced?
  
  
• 
  Can I just do
  
  for file in images:
  file.close()
  
  
  or what is the best way to close all open files?
  

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