python读取特定的行
fr = open(filename)for line in fr.readlines():
if line.startswith("#"):
continue
else:
## do something with line
## could use fr.readlines()from second line
import linecache
content_list = linecache.getlines(filename) ## Here using getlines
fourth_line = linecache.getline(filename, 4) ## Here using getline
## the above method is simpler.
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