示例檔案內容如下:
hello
world
python
通常來講，我們如果只是迭代檔案物件每一行，並做一些處理，是不需要將檔案物件轉成列表的，因為檔案物件本身可迭代，而且是按行迭代：
with open('somefile', 'r') as f:
for line in f:
print(line, end='')
"""hello
world
python
"""
with open('somefile','r') as f:
content = list(f)
print(content)
"""['hello\n', 'world\n', 'python']
"""
with open('somefile','r') as f:
content = f.readlines()
print(content)
"""['hello\n', 'world\n', 'python']
"""
方式一
with open('somefile','r') as f:
content = f.read().splitlines()
print(content)
"""['hello', 'world', 'python']
"""
with open('somefile','r') as f:
content = [line.rstrip('\n') for line in f]
print(content)
"""['hello', 'world', 'python']
"""
去掉行首行尾的空白字元
with open('somefile','r') as f:
content = [line.strip() for line in f]
print(content)
檔案物件是可迭代的（按行迭代），使用enumerate()即可在迭代的同時，得到數字索引(行號),enumerate()的預設數字初始值是0，如需指定1為起始，可以設定其第二個引數：
with open('somefile', 'r') as f:
for number, line in enumerate(f,start=1):
print(number, line, end='')
"""1 hello
2 world
3 python
"""
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