python报错:An unexpected error occurred: 'utf-8' codec can't decode byte 0xb9 in position 0: invalid start byte
时间: 2023-12-22 08:30:09 浏览: 180
根据提供的引用内容,出现报错"An unexpected error occurred: 'utf-8' codec can't decode byte 0xb9 in position 0: invalid start byte"是由于Python无法解码字节序列导致的。这种错误通常发生在尝试使用utf-8编码解码包含非法字符的字节序列时。
解决这个问题的方法是使用适当的编码来解码字节序列。可以尝试使用其他编码,如'latin-1'或'utf-16'来解码字节序列。下面是一个示例代码:
```python
byte_sequence = b'\xb9\x00\x00'
try:
decoded_string = byte_sequence.decode('utf-8')
print(decoded_string)
except UnicodeDecodeError:
decoded_string = byte_sequence.decode('latin-1')
print(decoded_string)
```
在上面的代码中,我们首先尝试使用utf-8编码来解码字节序列。如果出现UnicodeDecodeError错误,我们将使用latin-1编码来解码字节序列。
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C:\Users\18767\anaconda3\python.exe C:\Users\18767\Desktop\GUSHI\app.py * Serving Flask app 'app' * Debug mode: on WARNING: This is a development server. Do not use it in a production deployment. Use a production WSGI server instead. * Running on http://127.0.0.1:5000 Press CTRL+C to quit * Restarting with watchdog (windowsapi) * Debugger is active! * Debugger PIN: 431-810-334 127.0.0.1 - - [11/Jun/2025 10:46:54] "GET / HTTP/1.1" 200 - 127.0.0.1 - - [11/Jun/2025 10:46:55] "GET /static/css/show_data.css HTTP/1.1" 304 - 127.0.0.1 - - [11/Jun/2025 10:46:55] "GET /static/js/china.js HTTP/1.1" 304 - 127.0.0.1 - - [11/Jun/2025 10:46:55] "GET /static/js/template/show_data.js HTTP/1.1" 304 - 127.0.0.1 - - [11/Jun/2025 10:46:55] "GET /static/js/flexible.js HTTP/1.1" 304 - 127.0.0.1 - - [11/Jun/2025 10:46:55] "GET /static/js/jquery.js HTTP/1.1" 304 - 127.0.0.1 - - [11/Jun/2025 10:46:55] "GET /static/js/echarts.min.js HTTP/1.1" 304 - 127.0.0.1 - - [11/Jun/2025 10:46:55] "GET /static/js/echarts-wordcloud.min.js HTTP/1.1" 304 - 127.0.0.1 - - [11/Jun/2025 10:46:55] "GET /static/lib/layui/css/layui.css HTTP/1.1" 304 - 127.0.0.1 - - [11/Jun/2025 10:46:55] "GET /static/images/bg.jpg HTTP/1.1" 304 - 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127.0.0.1 - - [11/Jun/2025 10:46:56] "GET /static/lib/layui/lay/modules/jquery.js HTTP/1.1" 304 - 127.0.0.1 - - [11/Jun/2025 10:46:56] "GET /static/lib/layui/css/modules/layer/default/layer.css?v=3.1.1 HTTP/1.1" 304 - 127.0.0.1 - - [11/Jun/2025 10:46:56] "GET /static/lib/layui/lay/modules/util.js HTTP/1.1" 304 - 127.0.0.1 - - [11/Jun/2025 10:46:56] "GET /static/lib/layui/lay/modules/jquery.js HTTP/1.1" 304 - 127.0.0.1 - - [11/Jun/2025 10:46:56] "GET /static/lib/layui/css/modules/layer/default/layer.css?v=3.1.1 HTTP/1.1" 304 - 127.0.0.1 - - [11/Jun/2025 10:46:56] "GET /static/lib/layui/lay/modules/element.js HTTP/1.1" 304 - 127.0.0.1 - - [11/Jun/2025 10:46:56] "GET /static/lib/layui/lay/modules/jquery.js HTTP/1.1" 304 - 127.0.0.1 - - [11/Jun/2025 10:46:56] "GET /static/lib/layui/lay/modules/laypage.js HTTP/1.1" 304 - 127.0.0.1 - - [11/Jun/2025 10:46:56] "GET /static/lib/layui/lay/modules/element.js HTTP/1.1" 304 - 127.0.0.1 - - [11/Jun/2025 10:46:56] "GET /static/lib/layui/lay/modules/util.js HTTP/1.1" 304 - 127.0.0.1 - - [11/Jun/2025 10:46:56] "GET /static/lib/layui/lay/modules/element.js HTTP/1.1" 304 - 127.0.0.1 - - [11/Jun/2025 10:46:56] "GET /static/lib/layui/lay/modules/laypage.js HTTP/1.1" 304 - 127.0.0.1 - - [11/Jun/2025 10:46:57] "GET /static/lib/layui/lay/modules/element.js HTTP/1.1" 304 - 127.0.0.1 - - [11/Jun/2025 10:46:57] "GET /static/lib/layui/lay/modules/util.js HTTP/1.1" 304 - 127.0.0.1 - - [11/Jun/2025 10:46:57] "GET /static/lib/layui/lay/modules/util.js HTTP/1.1" 304 - 127.0.0.1 - - [11/Jun/2025 10:46:57] "GET /static/lib/layui/lay/modules/laypage.js HTTP/1.1" 304 - 127.0.0.1 - - [11/Jun/2025 10:46:57] "GET /static/lib/layui/lay/modules/util.js HTTP/1.1" 304 - 127.0.0.1 - - [11/Jun/2025 10:46:57] "GET /static/lib/layui/lay/modules/laypage.js HTTP/1.1" 304 - 127.0.0.1 - - [11/Jun/2025 10:46:57] "GET /static/lib/layui/lay/modules/laypage.js HTTP/1.1" 304 - 127.0.0.1 - - [11/Jun/2025 10:46:57] "POST /look_poem_desty HTTP/1.1" 500 - Traceback (most recent call last): File "C:\Users\18767\anaconda3\Lib\site-packages\flask\app.py", line 1498, in __call__ return self.wsgi_app(environ, start_response) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\18767\anaconda3\Lib\site-packages\flask\app.py", line 1476, in wsgi_app response = self.handle_exception(e) ^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\18767\anaconda3\Lib\site-packages\flask\app.py", line 1473, in wsgi_app response = self.full_dispatch_request() ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\18767\anaconda3\Lib\site-packages\flask\app.py", line 882, in full_dispatch_request rv = self.handle_user_exception(e) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\18767\anaconda3\Lib\site-packages\flask\app.py", line 880, in full_dispatch_request rv = self.dispatch_request() ^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\18767\anaconda3\Lib\site-packages\flask\app.py", line 865, in dispatch_request return self.ensure_sync(self.view_functions[rule.endpoint])(**view_args) # type: ignore[no-any-return] ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\18767\Desktop\GUSHI\app.py", line 229, in look_poem_desty ret, count = db.selectall(sql, (page,)) TypeError: cannot unpack non-iterable int object 127.0.0.1 - - [11/Jun/2025 10:46:57] "GET /static/lib/layui/font/iconfont.woff?v=240 HTTP/1.1" 304 - 127.0.0.1 - - [11/Jun/2025 10:46:57] "POST /look_poem_desty HTTP/1.1" 500 - Traceback (most recent call last): File "C:\Users\18767\anaconda3\Lib\site-packages\flask\app.py", line 1498, in __call__ return self.wsgi_app(environ, start_response) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\18767\anaconda3\Lib\site-packages\flask\app.py", line 1476, in wsgi_app response = self.handle_exception(e) ^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\18767\anaconda3\Lib\site-packages\flask\app.py", line 1473, in wsgi_app response = self.full_dispatch_request() ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\18767\anaconda3\Lib\site-packages\flask\app.py", line 882, in full_dispatch_request rv = self.handle_user_exception(e) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\18767\anaconda3\Lib\site-packages\flask\app.py", line 880, in full_dispatch_request rv = self.dispatch_request() ^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\18767\anaconda3\Lib\site-packages\flask\app.py", line 865, in dispatch_request return self.ensure_sync(self.view_functions[rule.endpoint])(**view_args) # type: ignore[no-any-return] ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\18767\Desktop\GUSHI\app.py", line 229, in look_poem_desty ret, count = db.selectall(sql, (page,)) TypeError: cannot unpack non-iterable int object 127.0.0.1 - - [11/Jun/2025 10:46:57] "GET /static/lib/layui/css/modules/layer/default/loading-2.gif HTTP/1.1" 304 - 127.0.0.1 - - [11/Jun/2025 10:46:57] "POST /look_poem_desty HTTP/1.1" 500 - Traceback (most recent call last): File "C:\Users\18767\anaconda3\Lib\site-packages\flask\app.py", line 1498, in __call__ return self.wsgi_app(environ, start_response) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\18767\anaconda3\Lib\site-packages\flask\app.py", line 1476, in wsgi_app response = self.handle_exception(e) ^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\18767\anaconda3\Lib\site-packages\flask\app.py", line 1473, in wsgi_app response = self.full_dispatch_request() ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\18767\anaconda3\Lib\site-packages\flask\app.py", line 882, in full_dispatch_request rv = self.handle_user_exception(e) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\18767\anaconda3\Lib\site-packages\flask\app.py", line 880, in full_dispatch_request rv = self.dispatch_request() ^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\18767\anaconda3\Lib\site-packages\flask\app.py", line 865, in dispatch_request return self.ensure_sync(self.view_functions[rule.endpoint])(**view_args) # type: ignore[no-any-return] ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\18767\Desktop\GUSHI\app.py", line 229, in look_poem_desty ret, count = db.selectall(sql, (page,)) TypeError: cannot unpack non-iterable int object 127.0.0.1 - - [11/Jun/2025 10:46:57] "POST /look_poem_desty HTTP/1.1" 500 - Traceback (most recent call last): File "C:\Users\18767\anaconda3\Lib\site-packages\flask\app.py", line 1498, in __call__ return self.wsgi_app(environ, start_response) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\18767\anaconda3\Lib\site-packages\flask\app.py", line 1476, in wsgi_app response = self.handle_exception(e) ^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\18767\anaconda3\Lib\site-packages\flask\app.py", line 1473, in wsgi_app response = self.full_dispatch_request() ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\18767\anaconda3\Lib\site-packages\flask\app.py", line 882, in full_dispatch_request rv = self.handle_user_exception(e) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\18767\anaconda3\Lib\site-packages\flask\app.py", line 880, in full_dispatch_request rv = self.dispatch_request() ^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\18767\anaconda3\Lib\site-packages\flask\app.py", line 865, in dispatch_request return self.ensure_sync(self.view_functions[rule.endpoint])(**view_args) # type: ignore[no-any-return] ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\18767\Desktop\GUSHI\app.py", line 229, in look_poem_desty ret, count = db.selectall(sql, (page,)) TypeError: cannot unpack non-iterable int object 127.0.0.1 - - [11/Jun/2025 10:46:57] "POST /get_where_relation_show_threePoemer HTTP/1.1" 500 - Traceback (most recent call last): File "C:\Users\18767\anaconda3\Lib\site-packages\py2neo\client\http.py", line 443, in from_json content = json_loads(data, object_hook=JSONHydrant.json_to_packstream) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\18767\anaconda3\Lib\json\__init__.py", line 359, in loads return cls(**kw).decode(s) ^^^^^^^^^^^^^^^^^^^ File "C:\Users\18767\anaconda3\Lib\json\decoder.py", line 337, in decode obj, end = self.raw_decode(s, idx=_w(s, 0).end()) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\18767\anaconda3\Lib\json\decoder.py", line 355, in raw_decode raise JSONDecodeError("Expecting value", s, err.value) from None json.decoder.JSONDecodeError: Expecting value: line 1 column 1 (char 0) The above exception was the direct cause of the following exception: Traceback (most recent call last): File "C:\Users\18767\anaconda3\Lib\site-packages\flask\app.py", line 1498, in __call__ return self.wsgi_app(environ, start_response) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\18767\anaconda3\Lib\site-packages\flask\app.py", line 1476, in wsgi_app response = self.handle_exception(e) ^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\18767\anaconda3\Lib\site-packages\flask\app.py", line 1473, in wsgi_app response = self.full_dispatch_request() ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\18767\anaconda3\Lib\site-packages\flask\app.py", line 882, in full_dispatch_request rv = self.handle_user_exception(e) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\18767\anaconda3\Lib\site-packages\flask\app.py", line 880, in full_dispatch_request rv = self.dispatch_request() ^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\18767\anaconda3\Lib\site-packages\flask\app.py", line 865, in dispatch_request return self.ensure_sync(self.view_functions[rule.endpoint])(**view_args) # type: ignore[no-any-return] ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\18767\Desktop\GUSHI\app.py", line 562, in get_where_relation_show_threePoemer data = graph.run( ^^^^^^^^^^ File "C:\Users\18767\anaconda3\Lib\site-packages\py2neo\database.py", line 405, in run return self.auto().run(cypher, parameters, **kwparameters) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\18767\anaconda3\Lib\site-packages\py2neo\database.py", line 989, in run result = self._connector.auto_run(cypher, parameters, ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\18767\anaconda3\Lib\site-packages\py2neo\client\__init__.py", line 1340, in auto_run return cx.auto_run(cypher, parameters, graph_name=graph_name, readonly=readonly) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\18767\anaconda3\Lib\site-packages\py2neo\client\http.py", line 177, in auto_run rs = HTTPResponse.from_json(r.status, r.data.decode("utf-8")) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\18767\anaconda3\Lib\site-packages\py2neo\client\http.py", line 445, in from_json raise_from(ProtocolError("Cannot decode response content as JSON"), error) File "<string>", line 3, in raise_from py2neo.errors.ProtocolError: Cannot decode response content as JSON 127.0.0.1 - - [11/Jun/2025 10:46:59] "POST /poemer_produce HTTP/1.1" 500 - Traceback (most recent call last): File "C:\Users\18767\anaconda3\Lib\site-packages\py2neo\client\http.py", line 443, in from_json content = json_loads(data, object_hook=JSONHydrant.json_to_packstream) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\18767\anaconda3\Lib\json\__init__.py", line 359, in loads return cls(**kw).decode(s) ^^^^^^^^^^^^^^^^^^^ File "C:\Users\18767\anaconda3\Lib\json\decoder.py", line 337, in decode obj, end = self.raw_decode(s, idx=_w(s, 0).end()) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\18767\anaconda3\Lib\json\decoder.py", line 355, in raw_decode raise JSONDecodeError("Expecting value", s, err.value) from None json.decoder.JSONDecodeError: Expecting value: line 1 column 1 (char 0) The above exception was the direct cause of the following exception: Traceback (most recent call last): File "C:\Users\18767\anaconda3\Lib\site-packages\flask\app.py", line 1498, in __call__ return self.wsgi_app(environ, start_response) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\18767\anaconda3\Lib\site-packages\flask\app.py", line 1476, in wsgi_app response = self.handle_exception(e) ^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\18767\anaconda3\Lib\site-packages\flask\app.py", line 1473, in wsgi_app response = self.full_dispatch_request() ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\18767\anaconda3\Lib\site-packages\flask\app.py", line 882, in full_dispatch_request rv = self.handle_user_exception(e) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\18767\anaconda3\Lib\site-packages\flask\app.py", line 880, in full_dispatch_request rv = self.dispatch_request() ^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\18767\anaconda3\Lib\site-packages\flask\app.py", line 865, in dispatch_request return self.ensure_sync(self.view_functions[rule.endpoint])(**view_args) # type: ignore[no-any-return] ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\18767\Desktop\GUSHI\app.py", line 139, in poemer_produce data = graph.run( ^^^^^^^^^^ File "C:\Users\18767\anaconda3\Lib\site-packages\py2neo\database.py", line 405, in run return self.auto().run(cypher, parameters, **kwparameters) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\18767\anaconda3\Lib\site-packages\py2neo\database.py", line 989, in run result = self._connector.auto_run(cypher, parameters, ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\18767\anaconda3\Lib\site-packages\py2neo\client\__init__.py", line 1340, in auto_run return cx.auto_run(cypher, parameters, graph_name=graph_name, readonly=readonly) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\18767\anaconda3\Lib\site-packages\py2neo\client\http.py", line 177, in auto_run rs = HTTPResponse.from_json(r.status, r.data.decode("utf-8")) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\18767\anaconda3\Lib\site-packages\py2neo\client\http.py", line 445, in from_json raise_from(ProtocolError("Cannot decode response content as JSON"), error) File "<string>", line 3, in raise_from py2neo.errors.ProtocolError: Cannot decode response content as JSON 127.0.0.1 - - [11/Jun/2025 10:46:59] "POST /get_author_message HTTP/1.1" 500 - Traceback (most recent call last): File "C:\Users\18767\anaconda3\Lib\site-packages\py2neo\client\http.py", line 443, in from_json content = json_loads(data, object_hook=JSONHydrant.json_to_packstream) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\18767\anaconda3\Lib\json\__init__.py", line 359, in loads return cls(**kw).decode(s) ^^^^^^^^^^^^^^^^^^^ File "C:\Users\18767\anaconda3\Lib\json\decoder.py", line 337, in decode obj, end = self.raw_decode(s, idx=_w(s, 0).end()) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\18767\anaconda3\Lib\json\decoder.py", line 355, in raw_decode raise JSONDecodeError("Expecting value", s, err.value) from None json.decoder.JSONDecodeError: Expecting value: line 1 column 1 (char 0) The above exception was the direct cause of the following exception: Traceback (most recent call last): File "C:\Users\18767\anaconda3\Lib\site-packages\flask\app.py", line 1498, in __call__ return self.wsgi_app(environ, start_response) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\18767\anaconda3\Lib\site-packages\flask\app.py", line 1476, in wsgi_app response = self.handle_exception(e) ^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\18767\anaconda3\Lib\site-packages\flask\app.py", line 1473, in wsgi_app response = self.full_dispatch_request() ^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\18767\anaconda3\Lib\site-packages\flask\app.py", line 882, in full_dispatch_request rv = self.handle_user_exception(e) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\18767\anaconda3\Lib\site-packages\flask\app.py", line 880, in full_dispatch_request rv = self.dispatch_request() ^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\18767\anaconda3\Lib\site-packages\flask\app.py", line 865, in dispatch_request return self.ensure_sync(self.view_functions[rule.endpoint])(**view_args) # type: ignore[no-any-return] ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\18767\Desktop\GUSHI\app.py", line 378, in get_author_message 'travel_name': travel_poem(author_name), ^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\18767\Desktop\GUSHI\app.py", line 334, in travel_poem data = graph.run( ^^^^^^^^^^ File "C:\Users\18767\anaconda3\Lib\site-packages\py2neo\database.py", line 405, in run return self.auto().run(cypher, parameters, **kwparameters) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\18767\anaconda3\Lib\site-packages\py2neo\database.py", line 989, in run result = self._connector.auto_run(cypher, parameters, ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\18767\anaconda3\Lib\site-packages\py2neo\client\__init__.py", line 1340, in auto_run return cx.auto_run(cypher, parameters, graph_name=graph_name, readonly=readonly) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\18767\anaconda3\Lib\site-packages\py2neo\client\http.py", line 177, in auto_run rs = HTTPResponse.from_json(r.status, r.data.decode("utf-8")) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ File "C:\Users\18767\anaconda3\Lib\site-packages\py2neo\client\http.py", line 445, in from_json raise_from(ProtocolError("Cannot decode response content as JSON"), error) File "<string>", line 3, in raise_from py2neo.errors.ProtocolError: Cannot decode response content as JSON 查看错误
### 解决Flask应用中TypeError和JSONDecodeError相关异常的方案
在Flask应用程序中,`TypeError: cannot unpack non-iterable int object` 和 `py2neo.errors.ProtocolError: Cannot decode response content as JSON` 是常见的运行时错误。以下是针对这些问题的专业解决方案。
#### 1. TypeError: cannot unpack non-iterable int object 的解决方法
当出现此类错误时,通常是因为尝试对一个非可迭代对象(如整数)进行解包操作。例如,在数据库查询中返回了单个值而不是元组或列表时,可能会发生此问题[^1]。
以下是一个示例代码片段,展示如何避免该错误:
```python
from flask import Flask, jsonify
app = Flask(__name__)
def is_admin(username):
# 假设这是一个模拟的数据库查询函数
result = get_user_role(username) # 返回值可能为 None 或 (role,)
if result is None:
return False
role, = result # 确保结果是可迭代的
return role == 'admin'
def get_user_role(username):
# 模拟数据库查询
users = {'zhangsan': ('admin',), 'lisi': ('user',)}
return users.get(username)
@app.route('/is_admin/<username>', methods=['GET'])
def check_admin(username):
try:
admin_status = is_admin(username)
return jsonify({'is_admin': admin_status})
except TypeError as e:
return jsonify({'error': str(e)}), 500
```
在上述代码中,通过检查返回值是否为`None`来避免对不可迭代对象进行解包操作。
#### 2. py2neo.errors.ProtocolError: Cannot decode response content as JSON 的解决方法
当使用`py2neo`库与Neo4j数据库交互时,如果服务器返回的内容无法被正确解析为JSON格式,可能会引发`ProtocolError`。这通常是由于Neo4j版本与`py2neo`版本不兼容引起的[^2]。
以下是一个解决方法:
```python
from py2neo import Graph, ProtocolError
graph = Graph("bolt://localhost:7687", auth=("neo4j", "password"))
def fetch_data(query):
try:
results = graph.run(query).data()
return results
except ProtocolError as e:
return {"error": str(e)}
@app.route('/fetch_nodes', methods=['GET'])
def get_nodes():
query = "MATCH (n) RETURN n LIMIT 25"
data = fetch_data(query)
return jsonify(data)
```
确保使用的`py2neo`版本与Neo4j版本兼容。例如,对于Neo4j 4.x版本,推荐使用`py2neo` 4.x版本[^2]。
#### 3. 防止JSONDecodeError 的最佳实践
`JSONDecodeError` 通常发生在尝试解析无效或格式错误的JSON数据时。可以通过以下方式避免:
- **验证请求数据**:确保客户端发送的JSON数据格式正确。
- **捕获异常**:在解析JSON数据时捕获`JSONDecodeError`。
以下是一个示例:
```python
from flask import request, jsonify
import json
@app.route('/process_data', methods=['POST'])
def process_data():
try:
data = request.get_json(force=True) # 强制解析JSON数据
if not data:
raise ValueError("Invalid JSON data")
result = handle_data(data)
return jsonify(result), 200
except json.JSONDecodeError as e:
return jsonify({"error": "Invalid JSON format", "details": str(e)}), 400
except ValueError as e:
return jsonify({"error": str(e)}), 400
```
#### 4. 日志记录与监控
为了更好地定位和解决问题,可以集成日志记录工具。例如,使用`logging`模块记录错误信息:
```python
import logging
logging.basicConfig(level=logging.DEBUG)
@app.errorhandler(Exception)
def handle_exception(e):
logging.error("An unexpected error occurred: %s", str(e))
return jsonify({'error': 'Internal Server Error'}), 500
```
### 示例代码总结
以下是一个完整的示例,结合了上述所有解决方案:
```python
from flask import Flask, request, jsonify
import logging
import json
from py2neo import Graph, ProtocolError
app = Flask(__name__)
logging.basicConfig(level=logging.DEBUG)
graph = Graph("bolt://localhost:7687", auth=("neo4j", "password"))
def fetch_data(query):
try:
results = graph.run(query).data()
return results
except ProtocolError as e:
return {"error": str(e)}
@app.route('/fetch_nodes', methods=['GET'])
def get_nodes():
query = "MATCH (n) RETURN n LIMIT 25"
data = fetch_data(query)
return jsonify(data)
@app.route('/process_data', methods=['POST'])
def process_data():
try:
data = request.get_json(force=True)
if not data:
raise ValueError("Invalid JSON data")
result = handle_data(data)
return jsonify(result), 200
except json.JSONDecodeError as e:
return jsonify({"error": "Invalid JSON format", "details": str(e)}), 400
except ValueError as e:
return jsonify({"error": str(e)}), 400
def handle_data(data):
# 处理数据逻辑
return {"status": "processed"}
@app.errorhandler(Exception)
def handle_exception(e):
logging.error("An unexpected error occurred: %s", str(e))
return jsonify({'error': 'Internal Server Error'}), 500
if __name__ == '__main__':
app.run(debug=True)
```
出现这个SyntaxError: invalid syntax
### 分析与解决 Python 中的 `SyntaxError: invalid syntax` 错误
当在程序中遇到 `SyntaxError: invalid syntax` 时,通常是因为代码存在语法错误。这种错误可能是由于拼写错误、不匹配的括号、非法字符或其他违反 Python 语法规则的原因引起的。
针对读取 EXIF 数据和处理经纬度的过程中可能出现的语法问题,以下是详细的分析和解决方案:
---
#### 可能的语法错误原因及修复方法
1. **函数定义或调用中的括号不匹配**
- 如果函数定义或调用中有遗漏或多余的括号,则会引发此错误。
- 示例:
```python
def get_exif_data(image_path:
pass
```
上述代码中缺少右括号 `)`,应更正为:
```python
def get_exif_data(image_path):
pass
```
2. **字符串引号未闭合**
- 字符串必须由成对的单引号 `'` 或双引号 `"` 包围。
- 示例:
```python
image_path = "example.jpg
```
正确的形式应该是:
```python
image_path = "example.jpg"
```
3. **缩进错误**
- Python 对缩进非常敏感。如果同一级别的代码块缩进不一致,也会报错。
- 示例:
```python
def convert_to_decimal(dms, ref):
degrees = dms[0][0] / dms[0][1]
minutes = dms[1][0] / dms[1][1] / 60.0
```
缩进不一致,修正后如下:
```python
def convert_to_decimal(dms, ref):
degrees = dms[0][0] / dms[0][1]
minutes = dms[1][0] / dms[1][1] / 60.0
```
4. **非法字符或特殊符号**
- 如果代码中意外包含了不可见字符(如 BOM),或者使用了非 ASCII 特殊符号,也可能导致语法错误。
- 解决办法:确保编辑器保存文件时采用 UTF-8 编码,并清除任何不必要的隐藏字符。
5. **逻辑运算符或比较操作符书写错误**
- 在条件判断中,可能会因为拼写错误而导致语法问题。
- 示例:
```python
if latitude is not None or longitude is NotNone:
```
这里的 `NotNone` 是无效的关键字,应改为 `not None`:
```python
if latitude is not None and longitude is not None:
```
6. **API 调用参数缺失或多余逗号**
- 当调用外部 API 函数时,若参数列表有遗漏或多出逗号,同样会产生语法错误。
- 示例:
```python
call_baidu_map_api(latitude,, longitude, api_key)
```
多余的逗号需移除:
```python
call_baidu_map_api(latitude, longitude, api_key)[^3]
```
7. **Python 版本兼容性问题**
- 某些功能可能仅适用于特定版本的 Python。例如,在较旧版本中无法直接解包字典键值对。
- 示例:
```python
for key, value in exif_data.items(): ...
```
若运行环境低于 Python 3.x,则需要升级解释器或将代码调整为兼容模式。
---
#### 修改后的完整代码示例
基于之前的实现,经过语法检查优化后的代码如下所示:
```python
from PIL import Image
from PIL.ExifTags import TAGS, GPSTAGS
import requests
def get_exif_data(image_path):
try:
image = Image.open(image_path)
exif_data = {}
info = image._getexif()
if info:
for tag, value in info.items():
decoded_tag = TAGS.get(tag, tag)
exif_data[decoded_tag] = value
return exif_data
except Exception as e:
print(f"Error while processing EXIF data: {e}")
return {}
def get_gps_info(exif_data):
gps_info = {}
if 'GPSInfo' in exif_data:
raw_gps_info = exif_data['GPSInfo']
for key in raw_gps_info.keys():
decode_key = GPSTAGS.get(key, key)
gps_info[decode_key] = raw_gps_info[key]
lat_ref = gps_info.get('GPSLatitudeRef')
lon_ref = gps_info.get('GPSLongitudeRef')
latitude = convert_to_decimal(gps_info.get('GPSLatitude'), lat_ref) if 'GPSLatitude' in gps_info else None
longitude = convert_to_decimal(gps_info.get('GPSLongitude'), lon_ref) if 'GPSLongitude' in gps_info else None
return latitude, longitude
return None, None
def convert_to_decimal(dms, ref):
if dms is None or ref is None:
return None
degrees = dms[0][0] / dms[0][1]
minutes = dms[1][0] / dms[1][1] / 60.0
seconds = dms[2][0] / dms[2][1] / 3600.0
decimal_value = degrees + minutes + seconds
if ref in ['S', 'W']:
decimal_value *= -1
return decimal_value
def call_baidu_map_api(latitude, longitude, api_key):
url = f"http://api.map.baidu.com/reverse_geocoding/v3/?ak={api_key}&output=json&coordtype=wgs84ll&location={latitude},{longitude}"
response = requests.get(url).json()
address = response['result']['formatted_address'] if 'result' in response and 'formatted_address' in response['result'] else "Unknown Location"
return address
# Main logic
image_path = "example.jpg" # Replace with actual photo path
baidu_api_key = "your_baidu_api_key_here"
try:
exif_data = get_exif_data(image_path)
latitude, longitude = get_gps_info(exif_data)
if latitude is not None and longitude is not None:
result = call_baidu_map_api(latitude, longitude, baidu_api_key)[^4]
print(f"Location found: Latitude {latitude}, Longitude {longitude}. Address: {result}")
else:
print("No valid GPS information was found.")
except SyntaxError as se:
print(f"A syntax error occurred: {se}")
except Exception as e:
print(f"An unexpected error occurred: {e}")
```
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