在字符串中使用特殊字符时，python用反斜杠转义字符，但有时我们并不想让转义字符生效，我们只想所见即所得，这种情况下可以用r来定义原始字符串
不使用r时
1
print('{"CreditScore": "{\"success\":true,\"biz_no\":\"ZM201807313000000874700550325893\",\"zm_score\":\"577\"}"}')
输出
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{"CreditScore": "{"success":true,"biz_no":"ZM201807313000000874700550325893","zm_score":"577"}"}
使用r时
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print(r'{"CreditScore": "{\"success\":true,\"biz_no\":\"ZM201807313000000874700550325893\",\"zm_score\":\"577\"}"}')
输出
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{"CreditScore": "{\"success\":true,\"biz_no\":\"ZM201807313000000874700550325893\",\"zm_score\":\"577\"}"}
