Is there a better way to write this case scenario?

[buran]

in python we usually use dicts in such kind of case scenario
here are two implementations, the second being more modular by implementing function

page_sizes = {1189:'A0', 841:'A1', 594:'A2', 420:'A3', 297:'A4'}
page_orientations = {True:'Portrait', False:'Landscape'}

p_size = page_sizes[max(mxd.pageSize.height, mxd.pageSize.width)]
p_orientation = page_orientations[mxd.pageSize.height>mxd.pageSize.width]
print("Page size is {} {}".format(p_size, p_orientation))

def page_info(height, width):
    page_sizes = {1189:'A0', 841:'A1', 594:'A2', 420:'A3', 297:'A4'}
    page_orientations = {True:'Portrait', False:'Landscape'}
    p_size = page_sizes[max(height, width)]
    p_orientation = page_orientations[height>width]
    return {'size':p_size, 'orientation':p_orientation}

p_info = page_info(height=mxd.pageSize.height, width=mxd.pageSize.width)
print("Page size is {size} {orientation}".format(**p_info))

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Eventually, to avoid KeyError when retrieve value from page_size (i.e. hieght is not present in the dict) you may use

p_size = page_sizes.get(max(height, width), 'Unknown') # may use None if you prefer

instead of

p_size = page_sizes[max(height, width)]

also note that if height=width, page_info will return "Landscape" for orientation. You may change the code if you prefer 'Portrait' in this particular case.