python编写程序输出诗句,我如何让python从包含一首诗的文件中仅读取其他所有行...

I know the code for reading every line is

f=open ('poem.txt','r')

for line in f:

print line

how do you have python read only even-numbered lines from the original file. Assuming 1-based numbering of lines.

解决方案

There are quite a few different ways, here a simple one

with open('poem.txt', 'r') as f:

count = 0

for line in f:

count+=1

if count % 2 == 0: #this is the remainder operator

print(line)

This also might be a little nicer, saving the lines for declaring and incrementing the count:

with open('poem.txt', 'r') as f:

for count, line in enumerate(f, start=1):

if count % 2 == 0:

print(line)

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