我想知道是否有方法可以在创建新的file.txt
之前找出有多少对值(开始,结束)。我的目标是检查我是否开始,结束价值超过一对,然后我想为每一对创建单独的文件。如果没有,那就把它留下。有没有一种方法可以统计我在产量中有多少值?
def searchPFAM(fname):
with open(fname,'rb') as f:
root = etree.parse(f)
for lcn in root.xpath("/protein/match[@dbname='PFAM']/lcn"):#find dbname =PFAM
try:
start = int(lcn.get("start"))#if it is PFAM then look for start value
end = int(lcn.get("end"))#if it is PFAM then also look for end value
yield start, end
except (TypeError , ValueError) as e:
pass
with open('newfile.txt','w') as fileinput:
for start, end in searchPFAM(fname):
print start, end
if start <= end:
text=''.join(makeList[(start-1):(end-1)])
fileinput.write(text)
不,你不能用'yield'做到这一点。 – 2012-07-12 21:22:45