有没有办法将所有列表转换为int以进行可订购的比较？

Question

代码：

    <bean id="credentials" class="org.springframework.integration.aws.core.BasicAWSCredentials">
        <property name="accessKey" value="${accessKey}"/>
        <property name="secretKey" value="${secretKey}"/>
    </bean>



    <bean id="clientConfiguration" class="com.amazonaws.ClientConfiguration">
        <property name="proxyHost" value="${proxyHost}"/>
        <property name="proxyPort" value="${proxyPort}"/>
    <property name="preemptiveBasicProxyAuth" value="false"/> 
    </bean>

    <bean id="s3Operations" class="org.springframework.integration.aws.s3.core.CustomC1AmazonS3Operations">
        <constructor-arg index="0" ref="credentials"/>
        <constructor-arg index="1" ref="clientConfiguration"/>
        <property name="awsEndpoint" value="s3.amazonaws.com"/>
        <property name="temporaryDirectory" value="${temporaryDirectory}"/>
        <property name="awsSecurityKey"  value="${awsSecurityKey}"/>
    </bean>



    <!-- aws-endpoint="https://s3.amazonaws.com"  -->
    <int-aws:s3-inbound-channel-adapter aws-endpoint="s3.amazonaws.com"
                                        bucket="${bucket}"
                                        s3-operations="s3Operations"
                                        credentials-ref="credentials"
                                        file-name-wildcard="${fileNameWildcard}"
                                        remote-directory="${remoteDirectory}"
                                        channel="splitChannel"
                                        local-directory="${localDirectory}"
                                        accept-sub-folders="false"
                                        delete-source-files="true"
                                        archive-bucket="${archiveBucket}"
                                        archive-directory="${archiveDirectory}">
    </int-aws:s3-inbound-channel-adapter>

错误：

    # COMPARISON BETWEEN REFERENCE AND NEW IMAGE #  
difference=[]
for hist_part in ref_hist:
    diff_score, diff_table= difference_histogram(hist_part[1],hist_part_new)
    difference.append(diff_score)
difference.append(ref_humidity)


# HUMIDITY CALCULATION #
min_score = min(difference)        # closest reference image

我想我需要将列表中的所有元素转换为int才能使它们成为可订购的类型。有什么建议吗？