df = df[df[col_name] > 70]
filter = df['column']!= 0
df = df[filter]
# select columns by name
df.filter(items=['col1', 'col2'])
alldata_balance = alldata[(alldata[IBRD] !=0) | (alldata[IMF] !=0)]
#To select rows whose column value is in list
years = [1952, 2007]
gapminder.year.isin(years)