使用for循环遍历DataFrame对象的列表

Question

I have this error:

TypeError: list indices must be integers or slices, not DataFrame

divisasIndica is a list of DataFrame objects, and I have this code:

datachart=[]
def dchart ():
    for i in divisasIndica[:]:
        df=divisasIndica[i]
        data = [ dict(
            type = 'candlestick',
            open = df.Open,
            high = df.High,
            low = df.Low,
            close = df.Close,
            x = df.index,
            rsi=df.RSI,
            SMA50=df.SMA50,
            SMA200=df.SMA200,
            SAR=df.SAR,
            yaxis = 'y2',
            name = tit,
            increasing = dict( line = dict( color = INCREASING_COLOR ) ),
            decreasing = dict( line = dict( color = DECREASING_COLOR ) ),
        ) ]
        layout=dict()

        fig = dict( data=data, layout=layout )
        datachart.append(fig)

The question is can't I read a list of DataFrames with for ?

Answer 1

The values of your list are already dataframes, no need to try to get them using an index. for i in divisasIndica gives you all the elements of divisasIndica directly, not their indexes. And there is no need to do divisasIndica[:] .

Change your code to this:

datachart=[]
def dchart ():
    for df in divisasIndica:
        data = [ dict(
            type = 'candlestick',
            open = df.Open,
            high = df.High,
            low = df.Low,
            close = df.Close,
            x = df.index,
            rsi=df.RSI,
            SMA50=df.SMA50,
            SMA200=df.SMA200,
            SAR=df.SAR,
            yaxis = 'y2',
            name = tit,
            increasing = dict( line = dict( color = INCREASING_COLOR ) ),
            decreasing = dict( line = dict( color = DECREASING_COLOR ) ),
        ) ]
        layout=dict()

        fig = dict( data=data, layout=layout )
        datachart.append(fig)

Answer 2

datachart=[]
def dchart (divisasIndica):
    for df in divisasIndica:
        data = [ dict(
            type = 'candlestick',
            open = df.Open,
            high = df.High,
            low = df.Low,
            close = df.Close,
            x = df.index,
            rsi=df.RSI,
            SMA50=df.SMA50,
            SMA200=df.SMA200,
            SAR=df.SAR,
            yaxis = 'y2',
            name = titu,
            increasing = dict( line = dict( color = INCREASING_COLOR ) ),
            decreasing = dict( line = dict( color = DECREASING_COLOR ) ),

        ) ]
        layout=dict()

        fig = dict( data=data, layout=layout )
        datachart.append(fig)