发电机功能
def group_by_heading( some_source ):
buffer= []
for line in some_source:
if line.startswith( "heading" ):
if buffer: yield buffer
buffer= [ line ]
else:
buffer.append( line )
yield buffer
with open( "some_file", "r" ) as source:
for heading_and_lines in group_by_heading( source ):
heading= heading_and_lines[0]
lines= heading_and_lines[1:]
# process away.
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