subtracting strings in array of data python

Question

I am trying to do the following:

create an array of random data
create an array of predefined codes (AW, SS)
subtract all numbers as well as any instance of predefined code.
if a string called "HL" remains after step 3, remove that as well and take the next alphabet pair. If a string called "HL" is the ONLY string in the array then take that.

I do not know how to go about completing steps 3 - 4.

1.

array_data = ['HL22','PG1234-332HL','1334-SF-21HL','HL43--222PG','HL222AW11144RH','HLSSDD','SSDD']

2.

predefined_code = ['AW','SS']

3.

ideally, results for this step will look like

result_data = [['HL'],['PG,HL'],['SF','HL'],['HL','PG'],['HL','RH'], 
['HL','DD'],['DD']

4. ideally, results for this step will look like this:

result_data = [['HL'],['PG'],['SF'],['PG'],['RH'], ['DD'],['DD']

for step 3, I have tried the following code

not_in_predefined = [item for item in array_data if item not in predefined_code]

but this doesnt produce the result im looking for, because it it checking item against item. not a partial string match.

Step 3 is pretty much where actual coding begins. What have you tried so far? — slider
– slider, Commented Oct 15, 2018 at 1:33

pecey · Accepted Answer · 2018-10-15 05:57:29Z

1

This is fairly simple using Regex.

re.findall(r'[A-Z].',item) should give you the text from your strings, and then you can do the required processing on that.

You may want to convert the list to a set eventually and use the difference operation, instead of looping and removing the elements defined in the predefined_code list.

answered Oct 15, 2018 at 5:57

pecey

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