docs: conanfile.py examples added to the installation chapter

docs/getting_started/installation_and_usage.md

@@ -239,12 +239,14 @@ The following steps may be performed to obtain an official library release:
    project's top-level directory and add **mp-units** as a dependency of your project.
    For example, the simplest file may look as follows:
 
-    ```ini title="conanfile.txt"
+    === "_conanfile.txt_"
+
+        ```ini
         [requires]
         mp-units/2.4.0
 
         [options]
-    # The below mp-units options are automatically deduced based on the current system's settings.
+        # The below mp-units options are automatically deduced based on the current settings.
         # Uncomment and set to an explicit value to override the auto-deduction.
         #
         # mp-units*:cxx_modules=True
@@ -262,6 +264,44 @@ The following steps may be performed to obtain an official library release:
         CMakeDeps
         ```
 
+    === "_conanfile.py_"
+
+        ```python
+        from conan import ConanFile
+        from conan.tools.build import can_run
+        from conan.tools.cmake import CMake, cmake_layout
+
+        class MPUnitsTestConan(ConanFile):
+            settings = "os", "arch", "compiler", "build_type"
+            generators = "CMakeDeps", "CMakeToolchain"
+
+            def requirements(self):
+                self.requires(
+                    "mp-units/2.4.0",
+                    options={
+                        # The below mp-units options are automatically deduced based on the current settings.
+                        # Uncomment and set to an explicit value to override the auto-deduction.
+                        #
+                        # "cxx_modules": False,
+                        # "import_std": False,
+                        # "std_format": True,
+                        # "no_crtp": True,
+                        # "contracts": "gsl-lite",
+                        # "freestanding": False,
+                    },
+                )
+
+            def layout(self):
+                cmake_layout(self)
+
+            def build(self):
+                cmake = CMake(self)
+                cmake.configure()
+                cmake.build()
+                if can_run(self):
+                    cmake.ctest(cli_args=["--output-on-failure"])
+        ```
+
 2. Import **mp-units** and its dependencies definitions with `find_package`:
 
     ```cmake
@@ -276,10 +316,19 @@ The following steps may be performed to obtain an official library release:
 
 4. Download, build, and install Conan dependencies before running the CMake configuration step:
 
+    === "_conanfile.txt_ or _conanfile.py_"
+
         ```shell
         conan install . -pr <your_conan_profile> -s compiler.cppstd=20 -b=missing
         cmake --preset conan-default
         cmake --build --preset conan-release
+        cmake --build --preset conan-release --target test
+        ```
+
+    === "_conanfile.py_ only"
+
+        ```shell
+        conan build . -pr <your_conan_profile> -s compiler.cppstd=20 -b=missing
         ```
 
 ### Conan + CMake (Live At Head)
@@ -306,12 +355,14 @@ with the following differences:
 
 2. In your Conan configuration file, provide the package identifier of the `mpusz/testing` stream:
 
-    ```ini title="conanfile.txt" hl_lines="2"
+    === "_conanfile.txt_"
+
+        ```ini hl_lines="2"
         [requires]
         mp-units/2.5.0@mpusz/testing
 
         [options]
-    # The below mp-units options are automatically deduced based on the current system's settings.
+        # The below mp-units options are automatically deduced based on the current settings.
         # Uncomment and set to an explicit value to override the auto-deduction.
         #
         # mp-units*:cxx_modules=True
@@ -329,6 +380,44 @@ with the following differences:
         CMakeDeps
         ```
 
+    === "_conanfile.py_"
+
+        ```python hl_lines="11"
+        from conan import ConanFile
+        from conan.tools.build import can_run
+        from conan.tools.cmake import CMake, cmake_layout
+
+        class MPUnitsTestConan(ConanFile):
+            settings = "os", "arch", "compiler", "build_type"
+            generators = "CMakeDeps", "CMakeToolchain"
+
+            def requirements(self):
+                self.requires(
+                    "mp-units/2.5.0@mpusz/testing",
+                    options={
+                        # The below mp-units options are automatically deduced based on the current settings.
+                        # Uncomment and set to an explicit value to override the auto-deduction.
+                        #
+                        # "cxx_modules": False,
+                        # "import_std": False,
+                        # "std_format": True,
+                        # "no_crtp": True,
+                        # "contracts": "gsl-lite",
+                        # "freestanding": False,
+                    },
+                )
+
+            def layout(self):
+                cmake_layout(self)
+
+            def build(self):
+                cmake = CMake(self)
+                cmake.configure()
+                cmake.build()
+                if can_run(self):
+                    cmake.ctest(cli_args=["--output-on-failure"])
+        ```
+
     !!! tip
 
         The identifiers of the latest packages can always be found in