python提示 urllib3 (1.26.7) or chardet (3.0.4) doesn’t match a supported version!

python使用requests的时候提示：

E:\python\lib\site-packages\requests\__init__.py:89: RequestsDependencyWarning: urllib3 (1.26.7) or chardet (3.0.4) doesn’t match a supported version!
warnings.warn("urllib3 ({}) or chardet ({}) doesn’t match a supported "

原因是urllib和chardet版本不匹配，查看文件E:\python\lib\site-packages\requests\__init__.py

# urllib3 >= 1.21.1, <= 1.24
    assert major == 1
    assert minor >= 21
    assert minor <= 24
    # Check chardet for compatibility.
    major, minor, patch = chardet_version.split('.')[:3]
    major, minor, patch = int(major), int(minor), int(patch)
    # chardet >= 3.0.2, < 3.1.0
    assert major == 3
    assert minor < 1
    assert patch >= 2

pip install "urllib3<=1.24" 执行这个就搞定了。