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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