Pipfile: failed to render version a_package>=1.0.0

[chfw]

[[source]]
url = 'https://pypi.python.org/simple'
verify_ssl = true
name = 'pypi'

[requires]
python_version= '3.6'

[packages]
    pyecharts>=1.0.0 <-- error

[dev-packages]
nose = "*"
mock = "*"
codecov = "*"
coverage = "*"
flake8 = "*"

pipenv throws the following error:
toml.decoder.TomlDecodeError: Found invalid character in key name: '>'. Try quoting the key name. (line 10 column 14 char 141)

[siddhpant]

I finally got time after exams, I'm looking into this.