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import time
import io
def parse_timestamp(t):
"""Parses a string containing a timestamp.
Args:
t (str): A string containing a timestamp.
Returns:
time.struct_time: A timestamp.
"""
if t is None or t == '0000-00-00T00:00:00Z':
return time.struct_time((0, 0, 0, 0, 0, 0, 0, 0, 0))
return time.strptime(t, '%Y-%m-%dT%H:%M:%SZ')
def read_in_chunks(stream, chunk_size):
while True:
data = stream.read(chunk_size)
if not data:
break
yield io.BytesIO(data)
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