functools.partial raising TypeError “got multiple values for keyword argument” Python

Question

I try to efficiently iterate over many strings and there is a repeated part of the strings I would like to insert with a partial function

def add_seqs(seqs_outer,sequence):
    return seqs_outer[0]+sequence+seqs_outer[1]

def my_function(string,start,stop,list_variable):
    seqs_pre=string[:start]
    seqs_post=string[stop:]
    seqs_outer=(seqs_pre,seqs_post)
    seqs_out=map(functools.partial(add_seqs,seqs_outer=seqs_outer),list_variable)
    return seqs_out

I finally want to use an apply function over many different strings with a fixed list_variable, but I get an error in my_function:

TypeError: my_function() got multiple values for keyword argument 'seqs_outer'

I guess I do something wrong in the use of partial - how can I make the above code work?

MaxS MaxS · Accepted Answer · 2017-11-09T16:13:24

Okay, inspired by this thread I swapped the order of arguments in

def add_seqs(seqs_outer,sequence)

to

def add_seqs(sequence,seqs_outer)

this did the job

functools.partial raising TypeError “got multiple values for keyword argument” Python

1 Answers