Question about syntax

[alaindebecker]

Hi,
I coudn't reach python-etl@googlegroups.com, so I am posting a question here.

The standard way to write a petl job is in imperative style, by assigning variables :

table1 = etl.fromcsv('example.csv')
table2 = etl.convert(table1, 'foo', 'upper')
table3 = etl.convert(table2, 'bar', int)
table4 = etl.convert('baz', float)
table = etl.addfield(table4, 'quux', lambda row: row.bar * row.baz)

Of course it is possible to use a functional syntax :

table = etl.addfield(
	etl.convert(
		etl.convert(
			etl.convert(
				etl.fromcsv('example.csv'), 
				'foo', 'upper'), 
			'bar', int), 
		'baz', float),
	'quux', lambda row: row.bar * row.baz)

My question is : is there a way to use a more natural chain syntax:

table = etl.fromcsv('example.csv') \
            .convert('foo', 'upper') \
            .convert('bar', int) \
            .convert('baz', float) \
            .addfield('quux', lambda row: row.bar * row.baz)

[alaindebecker]

Soorrryyyy, I should read the doc better.