How can I use a string in a loop to be used in a dataframe command? Using Python 3 -

say have dataframe named population contains series age , education. interested in running command pd.qcut example age write pd.qcut(population.age.values, [0, .25, .5, .75, 1],['a','b','c','d']).

i each column (and replace each column) in loop form, as:

col_name = ['age', 'education'] in col_name:     population.i=pd.qcut(population.i.values, [0, .25, .5, .75, 1],['a','b','c','d']) 

but cannot find right function opens string me in population.i.values. tried poped(i) didn't work.

thanks in advance.

you have use population[i] instead of population.i.

the pandas documentation indexing explain how access series corresponding colname doing frame[colname].

when doing population.i (called attribute access in doc) pandas looking columns names 'i'.