def load_installed_version(self):
        installed_packages = get_installed_pypackages()
        if self.package in installed_packages:
            self.version = "=={}".format(
                installed_packages[self.package].version)
def decode(value):
    if isinstance(value, bytes):
        value = value.decode(errors="surrogateescape")

    for char in ("\\", "\n", "\t"):
        value = value.replace(
            char.encode(encoding="unicode-escape").decode(), char
        )

    return value