[Python] Google vison response access changes in different system(using python)

I am using Google vision API for text annotations, but why in some systems, the system accepts this response.full_text_annotation.pages of Google vision, and in some systems it accepts this response["fullTextAnnotation"]["pages"] of Google vision?

Why is this so?, because of it I have to change the code again and again just to iterate over the response, in different systems.

for page in response["fullTextAnnotation"]["pages"]:
for block in page["blocks"]:
for paragraph in block["paragraphs"]:
for word in paragraph["words"]:
print(word)

-> but in some systems, the method it allows to iterate is

for text in response.full_text_annotation.pages:
for block in text.blocks:
for para in block.paragraphs:
for word in para.words:
print(word)

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