python利用pandas和xlrd读取excel，特征筛选删除0值超过99%的列

利用xlrd读取excel筛选0值超过99%的列，并删除import  xlrdworkbook=xlrd.open_workbook(r"123.xlsx")table = workbook.sheet_by_name(‘Sheet1‘)nrows=table.nrowsncols=table.ncolsdel_col=[]for j in range(ncols) :    sum = 0    for ai in table.col_values(j):        if ai == 0.0 :            sum+=1    if float(sum)/nrows>=0.99:        del_col.append(j)print del_col

利用pandas读取excel筛选0值超过99%的列，并删除

import pandas as pddf1=pd.read_csv(r"123.csv")df=pd.DataFrame(df1)nrows=df.shape[0]ncols=df.columns.sizedel_col=[]for j in range(ncols) :    sum = 0    for ai in df.iloc[:,j]:        if ai == 0.0 :            sum+=1    if float(sum)/nrows>=0.99:        del_col.append(j)print del_col