How to iterate over pdf pages using SimplePDFView?

[RayLei]

Very confused on iterating over all pages and extracting text from each page. I tried the following code. None succeed.

1. viewer.next()

while viewer.next():
    do sth

Got error on last page.

2. iter_pages()

for p in viewer.iter_pages():
    print('test')

Got errorTypeError: 'PagesIterator' object is not iterable

3. max_page: looks very clumsy

n_pages = len(list(viewer.doc.pages()))
for i in range(1, n_pages + 1):
    viewer.navigate(i)
    viewer.render()
    page_string = viewer.canvas.strings

May I ask how to iterate over all pages?