with open(filename) as f:
content = f.readlines()
# you may also want to remove whitespace characters like `\n` at the end of each line
content = [x.strip() for x in content]
参见输入和输出：
with open('filename') as f:
lines = f.readlines()
或者去掉换行符：
with open('filename') as f:
lines = [line.rstrip() for line in f]
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