Python函数中后续elif语句被忽略，仅前两个生效的问题求助

核心错误 #

你代码里从NULL_COUNT_COMPARISON开始的所有elif分支都漏写了条件判断逻辑，直接写成了elif "NULL_COUNT_COMPARISON":这种形式。在Python中，非空字符串会被当作布尔值True，所以只要前面的if和elif scenario=="TOTAL_COUNT_COMPARISON"不匹配，第一个值为True的分支（也就是"NULL_COUNT_COMPARISON"分支）就会被触发，后面的所有elif分支都会被直接跳过，这就是后续分支始终不执行的原因。

修正后的代码 #

def findDiff(dbDict, s3dict, scenario):
    comparison = {}
    dtype_table_check = True
    if scenario == "DTYPE_COMPARISON":
        comparison["DTYPE_COMPARISON"] = {}
        for k in dbDict:
            comparison["DTYPE_COMPARISON"][k] = {}
            if k in s3dict:
                if dbDict == s3dict:
                    comparison["DTYPE_COMPARISON"]["ALL_DATATYPES"] = {}
                    comparison["DTYPE_COMPARISON"]["ALL_DATATYPES"]["RESULT"] = True
                    break
                else:
                    for ke in dbDict[k]:
                        try:
                            x = s3dict[k][ke]
                            if dbDict[k][ke] == s3dict[k][ke]:
                                comparison["DTYPE_COMPARISON"][k][ke] = {}
                                comparison["DTYPE_COMPARISON"][k][ke]["RESULT"] = True
                            else:
                                comparison["DTYPE_COMPARISON"][k][ke] = {}
                                comparison["DTYPE_COMPARISON"][k][ke]["RESULT"] = False
                                dtype_table_check = False
                        except KeyError:
                            comparison["DTYPE_COMPARISON"][k][ke] = {}
                            comparison["DTYPE_COMPARISON"][k][ke]["RESULT"] = False
                            dtype_table_check = False
            else:
                comparison["DTYPE_COMPARISON"]["ALL_DATATYPES"]["RESULT"] = True
        comparison["DTYPE_COMPARISON"][k]["RESULT"] = dtype_table_check

    elif scenario == "TOTAL_COUNT_COMPARISON":
        comparison["TOTAL_COUNT_COMPARISON"] = {}
        for k in dbDict:
            if k in s3dict:
                if dbDict == s3dict:
                    comparison["TOTAL_COUNT_COMPARISON"][k] = {}
                    comparison["TOTAL_COUNT_COMPARISON"][k]["RESULT"] = True
                    break
                else:
                    comparison["TOTAL_COUNT_COMPARISON"][k] = {}
                    if dbDict[k] == s3dict[k]:
                        comparison["TOTAL_COUNT_COMPARISON"][k]["RESULT"] = True
                    else:
                        comparison["TOTAL_COUNT_COMPARISON"][k]["RESULT"] = False
            else:
                comparison["TOTAL_COUNT_COMPARISON"][k]["RESULT"] = False

    elif scenario == "NULL_COUNT_COMPARISON":
        comparison["NULL_COUNT_COMPARISON"] = {}
        for k in dbDict:
            if k in s3dict:
                if dbDict == s3dict:
                    comparison["NULL_COUNT_COMPARISON"][k] = {}
                    comparison["NULL_COUNT_COMPARISON"][k]["RESULT"] = True
                    break
                else:
                    comparison["NULL_COUNT_COMPARISON"][k] = {}
                    if dbDict[k] == s3dict[k]:
                        comparison["NULL_COUNT_COMPARISON"][k]["RESULT"] = True
                    else:
                        comparison["NULL_COUNT_COMPARISON"][k]["RESULT"] = False
            else:
                comparison["NULL_COUNT_COMPARISON"][k]["RESULT"] = False

    elif scenario == "UNIQUE_COUNT_COMPARISON":
        comparison["UNIQUE_COUNT_COMPARISON"] = {}
        for k in dbDict:
            if k in s3dict:
                if dbDict == s3dict:
                    comparison["UNIQUE_COUNT_COMPARISON"][k] = {}
                    comparison["UNIQUE_COUNT_COMPARISON"][k]["RESULT"] = True
                    break
                else:
                    comparison["UNIQUE_COUNT_COMPARISON"][k] = {}
                    if dbDict[k] == s3dict[k]:
                        comparison["UNIQUE_COUNT_COMPARISON"][k]["RESULT"] = True
                    else:
                        comparison["UNIQUE_COUNT_COMPARISON"][k]["RESULT"] = False
            else:
                comparison["UNIQUE_COUNT_COMPARISON"][k]["RESULT"] = False

    elif scenario == "UNIQUE_COMBINATION_COUNT_COMPARISON":
        comparison["UNIQUE_COMBINATION_COUNT_COMPARISON"] = {}
        for k in dbDict:
            if k in s3dict:
                if dbDict == s3dict:
                    comparison["UNIQUE_COMBINATION_COUNT_COMPARISON"][k] = {}
                    comparison["UNIQUE_COMBINATION_COUNT_COMPARISON"][k]["RESULT"] = True
                    break
                else:
                    comparison["UNIQUE_COMBINATION_COUNT_COMPARISON"][k] = {}
                    if dbDict[k] == s3dict[k]:
                        comparison["UNIQUE_COMBINATION_COUNT_COMPARISON"][k]["RESULT"] = True
                    else:
                        comparison["UNIQUE_COMBINATION_COUNT_COMPARISON"][k]["RESULT"] = False
            else:
                comparison["UNIQUE_COMBINATION_COUNT_COMPARISON"][k]["RESULT"] = False

    elif scenario == "DATAVALUE_COMPARISON":
        print("DATAVALUE_COMPARISON: ")
        # get table

    return comparison

额外注意点 #

除了修正条件判断，还统一了部分分支的缩进（比如UNIQUE_COUNT_COMPARISON分支之前的缩进层级错误），避免因缩进问题引发新的语法错误。

内容的提问来源于stack exchange，提问作者niacinamied_fiend