Python Flask 开发 - Flask 路径参数类型（string、int、float、path、uuid）

查看路径参数类型

for converter_name, converter_class in app.url_map.converters.items():
    print(f"{converter_name}: {converter_class}")

# 输出结果

default: <class 'werkzeug.routing.converters.UnicodeConverter'>
string: <class 'werkzeug.routing.converters.UnicodeConverter'>
any: <class 'werkzeug.routing.converters.AnyConverter'>
path: <class 'werkzeug.routing.converters.PathConverter'>
int: <class 'werkzeug.routing.converters.IntegerConverter'>
float: <class 'werkzeug.routing.converters.FloatConverter'>
uuid: <class 'werkzeug.routing.converters.UUIDConverter'>

---

一、string

@app.route('/user/<string:username>')
def show_string(username):
    return f'type: string, value: {username}, python_type: {type(username).__name__}'

1. 测试 /user/john_doe

   输出结果

   type: string, value: john_doe, python_type: str

2. 测试 /user/123

   输出结果

   type: string, value: 123, python_type: str

3. 测试 /user/john%20doe

   输出结果

   type: string, value: john doe, python_type: str

---

二、int

@app.route('/article/<int:article_id>')
def show_int(article_id):
    return f'type: int, value: {article_id}, python_type: {type(article_id).__name__}'

1. 测试 /article/42

   输出结果

   type: int, value: 42, python_type: int

2. 测试 /article/0

   输出结果

   type: int, value: 0, python_type: int

3. 测试 /article/-100

   输出结果

   Not Found

4. 测试 /article/3.14

   输出结果

   Not Found

5. 测试 /article/abc

   输出结果

   Not Found

6. 测试 /article/10abc

   输出结果

   Not Found

---

三、float

@app.route('/price/<float:price>')
def show_float(price):
    return f'type: float, value: {price}, python_type: {type(price).__name__}'

1. 测试 /price/19.99

   输出结果

   type: float, value: 19.99, python_type: float

2. 测试 /price/-5.5

   输出结果

   Not Found

3. 测试 /price/100

   输出结果

   Not Found

4. 测试 /price/100.0

   输出结果

   type: float, value: 100.0, python_type: float

5. 测试 /price/.5

   输出结果

   Not Found

6. 测试 /price/3.1415926

   输出结果

   type: float, value: 3.1415926, python_type: float

7. 测试 /price/10,5

   输出结果

   Not Found

8. 测试 /price/10k

   输出结果

   Not Found

9. 测试 /price/abc

   输出结果

   Not Found

---

四、path

1、演示

@app.route('/path/<path:filepath>')
def show_path(filepath):
    return f'type: path, value: {filepath}, python_type: {type(filepath).__name__}'

1. 测试 /path/docs

   输出结果

   type: path, value: docs, python_type: str

2. 测试 /path/docs/api

   输出结果

   type: path, value: docs/api, python_type: str

3. 测试 /path/docs/api/v1

   输出结果

   type: path, value: docs/api/v1, python_type: str

4. 测试 /path/static/css/style.css

   输出结果

   type: path, value: static/css/style.css, python_type: str

5. 测试 /path/a/b/../d

   输出结果

   type: path, value: a/b/../d, python_type: str

2、string 处理路径类型的问题

@app.route('/path/<string:filepath>')
def show_path(filepath):
    return f'type: string, value: {filepath}, python_type: {type(filepath).__name__}'

1. 测试 /path/docs

   输出结果

   type: string, value: docs, python_type: str

2. 测试 /path/docs/api

   输出结果

   Not Found

3. 测试 /path/docs/api/v1

   输出结果

   Not Found

4. 测试 /path/static/css/style.css

   输出结果

   Not Found

5. 测试 /path/a/b/../d

   输出结果

   Not Found

---

五、uuid

@app.route('/resource/<uuid:resource_id>')
def show_uuid(resource_id):
    return f'type: uuid, value: {resource_id}, python_type: {type(resource_id).__name__}'

1. 测试 /resource/123e4567-e89b-12d3-a456-426614174000

   输出结果

   type: uuid, value: 123e4567-e89b-12d3-a456-426614174000, python_type: UUID

2. 测试 /resource/550e8400-e29b-41d4-a716-446655440000

   输出结果

   type: uuid, value: 550e8400-e29b-41d4-a716-446655440000, python_type: UUID

3. 测试 /resource/not-a-uuid

   输出结果

   Not Found

4. 测试 /resource/123

   输出结果

   Not Found

5. 测试 /resource/123e4567-e89b-12d3-a456-42661417400（短了）

   输出结果

   Not Found

6. 测试 /resource/123e4567-e89b-12d3-a456-4266141740000（长了）

   输出结果

   Not Found