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14 lines
263 B
Python
14 lines
263 B
Python
a = open('123.txt', 'wt')
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a.write('123')
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a.write('456')
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a.close()
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with open('123.txt', 'rt') as f:
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assert f.read() == '123456'
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with open('123.txt', 'a') as f:
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f.write('测试')
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with open('123.txt', 'r') as f:
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assert f.read() == '123456' + '测试'
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