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已知当前工作目录下存在文本文件test.txt，其存储内容为两行：第一行hello，第二行python，两行通过换行符分隔。
hello
python
执行代码with open('test.txt', 'r') as f: content = f.read()后，content的值为'hello\npython'
with open('test.txt', 'r') as f: content = f.read()
content
'hello\npython'
执行代码with open('test.txt', 'r') as f: lines = f.readlines()后，lines的值为['hello', 'python']
with open('test.txt', 'r') as f: lines = f.readlines()
lines
['hello', 'python']
执行代码with open('test.txt', 'r') as f: line = f.readline()后，line的值为'python'
with open('test.txt', 'r') as f: line = f.readline()
line
'python'
执行代码with open('test.txt', 'r') as f: print(f.read()); print(f.read())会两次输出完全相同的文件内容
with open('test.txt', 'r') as f: print(f.read()); print(f.read())