1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
|
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())
async 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
for chunk in stream.result:
yield chunk
stream.clear()
async def on_get(self, req, resp):
resp.content_type = 'text/csv'
resp.downloadable_as = 'report.csv'
resp.stream = self.fibonacci_generator()
|
