python只读,只读具体行（Python）

I'm using a for loop to read a file, but I only want to read specific lines, say line #26 and #30. Is there any built-in feature to achieve this?

Thanks

解决方案

If the file to read is big, and you don't want to read the whole file in memory at once:

fp = open("file")

for i, line in enumerate(fp):

if i == 25:

# 26th line

elif i == 29:

# 30th line

elif i > 29:

break

fp.close()

Note that i == n-1 for the nth line.

In Python 2.6 or later:

with open("file") as fp:

for i, line in enumerate(fp):

if i == 25:

# 26th line

elif i == 29:

# 30th line

elif i > 29:

break

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