The correct name of the parameter you are looking for: pageSize. Reference documents provide complete API specifications.
def get_report(analytics):
return analytics.reports().batchGet(
body={
'reportRequests': [
{
'viewId': VIEW_ID,
'pageSize': 10000,
'dateRanges': [{'startDate': '2016-04-01', 'endDate': '2016-08-09'}],
'dimensions': [{'name':'ga:date'},
{'name': 'ga:channelGrouping'}],
'metrics': [{'expression': 'ga:sessions'},
{'expression': 'ga:newUsers'},
{'expression': 'ga:goal15Completions'},
{'expression': 'ga:goal9Completions'},
{'expression': 'ga:goal10Completions'}]
}]
}
).execute()
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