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import csv
class Report:
class PseudoTextStream:
def __init__(self):
self.clear()
def clear(self):
self.result = []
def write(self, data):
self.result.append(data.encode())
def fibonacci_generator(self, n=1000):
stream = self.PseudoTextStream()
writer = csv.writer(stream, quoting=csv.QUOTE_NONNUMERIC)
writer.writerow(('n', 'Fibonacci Fn'))
previous = 1
current = 0
for i in range(n + 1):
writer.writerow((i, current))
previous, current = current, current + previous
yield from stream.result
stream.clear()
def on_get(self, req, resp):
resp.content_type = 'text/csv'
resp.downloadable_as = 'report.csv'
resp.stream = self.fibonacci_generator()
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