[cpython]: Invalid pkg_config name

[ashfyre]

Package and Environment Details (include every applicable attribute)

• Package Name/Version: cpython/3.9.7
• Operating System+version: Windows 10 64-bit
• Compiler+version: n/a
• Docker image: n/a
• Conan version: conan 1.42.2
• Python version: Python 3.7.4

Conan profile (output of conan profile show default or conan profile show <profile> if custom profile is in use)

[settings]
os=Windows
os_build=Windows
arch=x86_64
arch_build=x86_64
compiler=Visual Studio
compiler.version=16
build_type=Release
[options]
[conf]
[build_requires]
[env]

Steps to reproduce (Include if Applicable)

Attempt to generate for pkg-config with this library as a requirement. Example repro conanfile:

from conans import ConanFile

class test_py(ConanFile):
    name = "test"
    version = "0.0.1"
    generators = "pkg_config"

    requires = ["cpython/3.9.7"]

My output is:

conanfile.py (test/0.0.1): Installing package
Requirements
    cpython/3.9.7 from 'conancenter' - Cache
    zlib/1.2.11 from 'conancenter' - Cache
Packages
    cpython/3.9.7:d140711d95cc16a85766a8fc3a551dfafe84cf63 - Cache
    zlib/1.2.11:3fb49604f9c2f729b85ba3115852006824e72cab - Cache

Installing (downloading, building) binaries...
zlib/1.2.11: Already installed!
cpython/3.9.7: Already installed!
cpython/3.9.7: Appending PATH environment variable: C:\Users\<>\.conan\data\cpython\3.9.7\_\_\package\d140711d95cc16a85766a8fc3a551dfafe84cf63\bin
cpython/3.9.7: Setting PYTHON environment variable: C:\Users\<>\.conan\data\cpython\3.9.7\_\_\package\d140711d95cc16a85766a8fc3a551dfafe84cf63\bin\python.exe
cpython/3.9.7: Setting PYTHON environment variable: C:\Users\<>\.conan\data\cpython\3.9.7\_\_\package\d140711d95cc16a85766a8fc3a551dfafe84cf63\bin
cpython/3.9.7: Setting PYTHON_ROOT environment variable: C:\Users\<>\.conan\data\cpython\3.9.7\_\_\package\d140711d95cc16a85766a8fc3a551dfafe84cf63
conanfile.py (test/0.0.1): ERROR: Generator pkg_config(file:None) failed
sequence item 2: expected str instance, list found
ERROR: sequence item 2: expected str instance, list found

I've tracked the bug to this line of code in the recipe:

        self.cpp_info.components["_embed_copy"].names["pkg_config"] = ["python{}-embed".format(py_version.major)]

That property should be a string. Deleting the square brackets fixes this, at least on my end. May I open up a PR to patch this?

[SpaceIm]

That property should be a string. Deleting the square brackets fixes this, at least on my end. May I open up a PR to patch this?

Sure