How to create converters for pandas?

Question

I want to read in a CSV file with pandas. Two columns are to be multiplied by a different constant each.

params = {
    "table-columns": ['A', 'B'],
    "multiplicands": ['0.001', '0.000001']
}

converters_ = {}
for i in range(0,len(params['table-columns'])):
    column = params['table-columns'][i]
    multiplicand = params['multiplicands'][i]
    display(column + '/' + multiplicand)
    func = lambda x: float(x) * float(multiplicand)
    converters_[column] = func
display(converters_['A'](1)) # should be 1e-03
display(converters_['B'](1)) # should be 1e-06

#df = pd.read_csv('data.csv', converters=converters_)

This is the output:

'A/0.001'
'B/0.000001'
1e-06
1e-06

Column A should be multiplied by 0.001, but it is multiplied by 0.000001. Where is the bug here?