Python lambda issue

Asked Nov 07 '18 at 19:35

Active Nov 07 '18 at 19:35

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I'm trying to update a field in a *.dbf file.

For this I have created a function inspired from Search in DBF and update record.

My function look like this:

def read_one_db_fox_record(database, collName, colMatch):
    path = 'c://'
    db = dbf.Table(path +database+'.dbf')
    db = db.open(mode=dbf.READ_WRITE)

    with db:

        x = lambda rec,col=collName: (rec.col)
        #Problem is somewhere here

        procod_idx = db.create_index(x)
        match = procod_idx.search(match=(colMatch))
        record = match[0]
        logging.debug(record)
        db.close()

Call:

read_one_db_fox_record('db', 'keye', '1')

Output:

raise FieldMissingError(name)
FieldMissingError: 'col:  no such field in table'

Why lamba is not passing collName value to col? I was expecting lambda to call rec.keye.

asked Nov 07 '18 at 19:35

Dragos Vasile

1

what is this `(rec.col)` supposed to do? – thebjorn Nov 07 '18 at 19:38
3

the argument `col` has nothing to do with the attribute access `rec.col`, you probably want `getattr(rec, col)` this has nothing to do with lambdas, which are just functions (and would work the same with normal functions - or with no functions at all) – juanpa.arrivillaga Nov 07 '18 at 19:39
It supposed to select the table column for index – Dragos Vasile Nov 07 '18 at 19:40
Can you post the full error trace? – killian95 Nov 07 '18 at 19:47
@juanpa.arrivillaga is right. Thank you for your rapid response. – Dragos Vasile Nov 07 '18 at 19:50

Python lambda issue

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