<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def sanitize_ssl(self):
 """Use local installed certificate file if available. Tries to get system, then certifi, then the own installed certificate file."""

        if self["sslverify"] is True:
            try:
                self["sslverify"] = get_system_cert_file()
            except ValueError:
                try:
                    self["sslverify"] = get_certifi_file()
                except (ValueError, ImportError):
                    try:
                        self["sslverify"] = get_share_file('cacert.pem')
                    except ValueError:
                        pass