如何清除数据帧中的所有数据，以便通过for循环进行下一次迭代时它们为空？

分类：编程问答

如何解决如何清除数据帧中的所有数据，以便通过for循环进行下一次迭代时它们为空？

我构建了一个脚本，该脚本使用Google Analytics（分析）API来从多个视图ID中获取数据。代码的末尾是一个for循环，它循环运行我构建的许多函数并从中构建数据框。我想发生的是，在每个商店的每个“循环/迭代”之后，数据都将附加到循环外部的新数据帧中。我一直遇到一个问题，尽管数据可以很好地附加到第一个视图ID，但是当它到达第二个视图ID时，它似乎保留了旧数据（从第一次迭代开始），并且在覆盖某些值时将其加倍。

例如此代码。...

lz = zip(LI,DN,VI,V,DA,S,D)
sd = '2020-08-01'
ed = '2020-08-31'

parser = argparse.ArgumentParser(
      formatter_class=argparse.RawDescriptionHelpFormatter,parents=[tools.argparser])
flags = parser.parse_args([])

flow = client.flow_from_clientsecrets(
     CLIENT_SECRETS_PATH,scope=SCOPES,message=tools.message_if_missing(CLIENT_SECRETS_PATH))

dFI = {'DP7': 'arsseven.dat','DP6': 'arssix.dat','DP4': 'arsfour.dat','DP0': 'arszero.dat'}

hSeg = {'DP7': {'X': 'gaid::3fifjFfj33rokQ','Y': 'gaid::friH58F939Fgoj3I'},'DP6': {'Z': 'gaid::fotkj345DdjgIcg','Y': 'gaid::eofWfjF5834cVfj'},'DP4': {'W': 'gaid::fkormvroE333nr3fg'},'DP0': {'V': 'gaid::Jfoeo455efFggrjor'}}

gaDO = []
gaDT = []

def getGADO(VI,sd,ed):
    l = vi_start + str(int(VI))
    response = analytics.reports().batchGet(
            body={
            'reportRequests': [
            {
                'viewId': l,'dateRanges': [{'sd': sd,'ed': ed}],'metrics': [
                    {'expression': 'ga:users'},{'expression': 'ga:avgSessionDuration'}
                    ],'dimensions': [
                    {'name': 'ga:channelGrouping'}
                    ]
            }]}).execute()
    report_list = response.get('reports')
    for report in report_list:
        data_rows = report.get('data',{}).get('rows',[])
        for row in data_rows:
            dimensions_in_row = row.get('dimensions')
            metrics_rows = row.get('metrics')
            for metrics in metrics_rows:
                metrics_values = metrics.get('values')
                full_row_data = dimensions_in_row + metrics_values
                gaDO.append(full_row_data)

    gaDON = []
    for i in gaDO:
        new_tuple = []
        new_tuple.append(i[0])
        new_tuple.append(int(i[1]))
        new_tuple.append(float(i[2]))
        gaDON.append(tuple(new_tuple))

    colO = [
    #Dimensions
    'DCG',#Metrics
    'Users','ASD']
    dfO = pd.DataFrame(gaDON,columns = colO)
    print(dfO)
    return dfO

def getGADT(VI,'metrics': [
                    {'expression': 'ga:users'}
                    ],'dimensions': [
                    {'name': 'ga:channelGrouping'},{'name': 'ga:segment'}
                    ],'segments': [
                    {
                        'segmentId': hSeg[DA][V]
                    }]
            }]}).execute()
    report_list = response.get('reports')
    for report in report_list:
        data_rows = report.get('data',[])
        for row in data_rows:
            dimensions_in_row = row.get('dimensions')
            metrics_rows = row.get('metrics')
            for metrics in metrics_rows:
                metrics_values = metrics.get('values')
                full_row_data = dimensions_in_row + metrics_values
                gaDT.append(full_row_data)

    gaDTN = []
    for i in gaDT:
        new_tuple = []
        new_tuple.append(i[0])
        new_tuple.append(int(float(i[2])))
        gaDTN.append(tuple(new_tuple))

    colT = [
    #Dimensions
    'DCG',#Metrics
    'TU']
    dfT = pd.DataFrame(gaDTN,columns = colT)
    print(dfT)
    return dfT

dcgX = pd.DataFrame()

for LI,D in locations_zip:
    dID_str = str(int(LI))
    stor_str = dFI[DA]
    storage = file.Storage(stor_str)
    credentials = storage.get()
    if credentials is None or credentials.invalid:
        credentials = tools.run_flow(flow,storage,flags)
    http = credentials.authorize(http=httplib2.Http())
    analytics = build('analytics','v4',http=http,discoveryServiceUrl=DISCOVERY_URI)
    vi_start = 'ga:'
    dfOX = getGADO(VI,ed)
    dfTX = getGADT(VI,ed)
    
    dcg = pd.merge(dfOX,dfTX,how = 'outer',on = ['DCG']).fillna(0)
    dcg = dcg[['DCG','Users','TU','ASD']]

    dcg.insert(loc=0,column='LI',value=LI)
    dcg.insert(loc=1,column='DN',value=DN)
    
    dcgx = dcgX.append(dcg)

在前两个商店中运行时会产生一些东西...

编辑：更改表以尝试显示并非每个viewID都具有相同的标准化维行/值集，这些维行/值将从viewID到viewID相匹配。例如，CWA仅具有自然搜索和付费搜索，而没有展示。

╔═══════╦═════╦════════════════╦═══════╦═════╦═════╗
║ DI    ║ DN  ║ DFG            ║ Users ║ TU  ║ ASD ║
╠═══════╬═════╬════════════════╬═══════╬═════╬═════╣
║ 12345 ║ MHA ║ Organic Search ║ 4392  ║ 589 ║ 30  ║
╠═══════╬═════╬════════════════╬═══════╬═════╬═════╣
║ 12345 ║ MHA ║ Paid Search    ║ 3939  ║ 405 ║ 150 ║
╠═══════╬═════╬════════════════╬═══════╬═════╬═════╣
║ 12345 ║ MHA ║ Display        ║ 12    ║ 0   ║ 123 ║
╠═══════╬═════╬════════════════╬═══════╬═════╬═════╣
║ 12346 ║ JBA ║ Organic Search ║ 4392  ║ 589 ║ 30  ║
╠═══════╬═════╬════════════════╬═══════╬═════╬═════╣
║ 12346 ║ JBA ║ Organic Search ║ 4392  ║ 96  ║ 30  ║
╠═══════╬═════╬════════════════╬═══════╬═════╬═════╣
║ 12346 ║ JBA ║ Organic Search ║ 2489  ║ 589 ║ 121 ║
╠═══════╬═════╬════════════════╬═══════╬═════╬═════╣
║ 12346 ║ JBA ║ Organic Search ║ 2489  ║ 96  ║ 121 ║
╠═══════╬═════╬════════════════╬═══════╬═════╬═════╣
║ 12346 ║ JBA ║ Paid Search    ║ 3939  ║ 405 ║ 150 ║
╠═══════╬═════╬════════════════╬═══════╬═════╬═════╣
║ 12346 ║ JBA ║ Paid Search    ║ 3939  ║ 80  ║ 150 ║
╠═══════╬═════╬════════════════╬═══════╬═════╬═════╣
║ 12346 ║ JBA ║ Paid Search    ║ 1345  ║ 405 ║ 45  ║
╠═══════╬═════╬════════════════╬═══════╬═════╬═════╣
║ 12346 ║ JBA ║ Paid Search    ║ 1345  ║ 80  ║ 45  ║
╠═══════╬═════╬════════════════╬═══════╬═════╬═════╣
║ 12346 ║ JBA ║ Display        ║ 12    ║ 0   ║ 123 ║
╠═══════╬═════╬════════════════╬═══════╬═════╬═════╣
║ 12346 ║ JBA ║ Display        ║ 12    ║ 1   ║ 123 ║
╠═══════╬═════╬════════════════╬═══════╬═════╬═════╣
║ 12346 ║ JBA ║ Display        ║ 400   ║ 0   ║ 60  ║
╠═══════╬═════╬════════════════╬═══════╬═════╬═════╣
║ 12346 ║ JBA ║ Display        ║ 400   ║ 1   ║ 60  ║
╠═══════╬═════╬════════════════╬═══════╬═════╬═════╣
║ 12347 ║ CWA ║ Organic Search ║ 4392  ║ 589 ║ 30  ║
╠═══════╬═════╬════════════════╬═══════╬═════╬═════╣
║ 12347 ║ CWA ║ Organic Search ║ 4392  ║ 96  ║ 30  ║
╠═══════╬═════╬════════════════╬═══════╬═════╬═════╣
║ 12347 ║ CWA ║ Organic Search ║ 4392  ║ 12  ║ 30  ║
╠═══════╬═════╬════════════════╬═══════╬═════╬═════╣
║ 12347 ║ CWA ║ Organic Search ║ 2489  ║ 589 ║ 121 ║
╠═══════╬═════╬════════════════╬═══════╬═════╬═════╣
║ 12347 ║ CWA ║ Organic Search ║ 2489  ║ 96  ║ 121 ║
╠═══════╬═════╬════════════════╬═══════╬═════╬═════╣
║ 12347 ║ CWA ║ Organic Search ║ 2489  ║ 12  ║ 121 ║
╠═══════╬═════╬════════════════╬═══════╬═════╬═════╣
║ 12347 ║ CWA ║ Organic Search ║ 5888  ║ 589 ║ 75  ║
╠═══════╬═════╬════════════════╬═══════╬═════╬═════╣
║ 12347 ║ CWA ║ Organic Search ║ 5888  ║ 96  ║ 75  ║
╠═══════╬═════╬════════════════╬═══════╬═════╬═════╣
║ 12347 ║ CWA ║ Organic Search ║ 5888  ║ 12  ║ 75  ║
╠═══════╬═════╬════════════════╬═══════╬═════╬═════╣
║ 12347 ║ CWA ║ Paid Search    ║ 3939  ║ 405 ║ 150 ║
╠═══════╬═════╬════════════════╬═══════╬═════╬═════╣
║ 12347 ║ CWA ║ Paid Search    ║ 3939  ║ 80  ║ 150 ║
╠═══════╬═════╬════════════════╬═══════╬═════╬═════╣
║ 12347 ║ CWA ║ Paid Search    ║ 3939  ║ 600 ║ 150 ║
╠═══════╬═════╬════════════════╬═══════╬═════╬═════╣
║ 12347 ║ CWA ║ Paid Search    ║ 1345  ║ 405 ║ 45  ║
╠═══════╬═════╬════════════════╬═══════╬═════╬═════╣
║ 12347 ║ CWA ║ Paid Search    ║ 1345  ║ 80  ║ 45  ║
╠═══════╬═════╬════════════════╬═══════╬═════╬═════╣
║ 12347 ║ CWA ║ Paid Search    ║ 1345  ║ 600 ║ 45  ║
╠═══════╬═════╬════════════════╬═══════╬═════╬═════╣
║ 12347 ║ CWA ║ Paid Search    ║ 7001  ║ 405 ║ 91  ║
╠═══════╬═════╬════════════════╬═══════╬═════╬═════╣
║ 12347 ║ CWA ║ Paid Search    ║ 7001  ║ 80  ║ 91  ║
╠═══════╬═════╬════════════════╬═══════╬═════╬═════╣
║ 12347 ║ CWA ║ Paid Search    ║ 7001  ║ 600 ║ 91  ║
╠═══════╬═════╬════════════════╬═══════╬═════╬═════╣
║ 12347 ║ CWA ║ Display        ║ 12    ║ 0   ║ 123 ║
╠═══════╬═════╬════════════════╬═══════╬═════╬═════╣
║ 12347 ║ CWA ║ Display        ║ 12    ║ 1   ║ 123 ║
╠═══════╬═════╬════════════════╬═══════╬═════╬═════╣
║ 12347 ║ CWA ║ Display        ║ 400   ║ 0   ║ 60  ║
╠═══════╬═════╬════════════════╬═══════╬═════╬═════╣
║ 12347 ║ CWA ║ Display        ║ 400   ║ 1   ║ 60  ║
╚═══════╩═════╩════════════════╩═══════╩═════╩═════╝

我希望它看起来像这样... 

╔═══════╦═════╦════════════════╦═══════╦═════╦═════╗
║ DI    ║ DN  ║ DFG            ║ Users ║ TU  ║ ASD ║
╠═══════╬═════╬════════════════╬═══════╬═════╬═════╣
║ 12345 ║ MHA ║ Organic Search ║ 4392  ║ 589 ║ 30  ║
╠═══════╬═════╬════════════════╬═══════╬═════╬═════╣
║ 12345 ║ MHA ║ Paid Search    ║ 3939  ║ 405 ║ 150 ║
╠═══════╬═════╬════════════════╬═══════╬═════╬═════╣
║ 12345 ║ MHA ║ Display        ║ 12    ║ 0   ║ 123 ║
╠═══════╬═════╬════════════════╬═══════╬═════╬═════╣
║ 12346 ║ JBA ║ Organic Search ║ 2489  ║ 96  ║ 121 ║
╠═══════╬═════╬════════════════╬═══════╬═════╬═════╣
║ 12346 ║ JBA ║ Paid Search    ║ 1345  ║ 80  ║ 45  ║
╠═══════╬═════╬════════════════╬═══════╬═════╬═════╣
║ 12346 ║ JBA ║ Display        ║ 400   ║ 1   ║ 60  ║
╠═══════╬═════╬════════════════╬═══════╬═════╬═════╣
║ 12347 ║ CWA ║ Organic Search ║ 5888  ║ 12  ║ 75  ║
╠═══════╬═════╬════════════════╬═══════╬═════╬═════╣
║ 12347 ║ CWA ║ Paid Search    ║ 7001  ║ 600 ║ 91  ║
╚═══════╩═════╩════════════════╩═══════╩═════╩═════╝

我尝试使用...在循环结束时（在dcgx = dcgX.append（dcg）之后）清除dfOX和dfTX数据帧。

del dfOX
del dfTX

但这没用。我也尝试过在它们上使用.iloc [0：0]，但这也不起作用。

我不确定如何在for循环的末尾清除数据帧，因此在下一次迭代中它是空的。这是我可以想到的唯一方法，但是还有更好的方法吗？

任何见识将不胜感激！谢谢！

解决方法

尝试将参数drop_duplicates设置为keep的{​​{1}}

假设您的数据帧称为last

我不会讲您的代码，但是请注意，在熊猫中使用循环是一种反模式，除非没有其他选择，否则是一个很大的禁忌。

df

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