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Selector

Selector fields is used to parse field values from HTML. There are three selectors right now:

• XPath
• Css
• Regex

Core arguments

Each Selector field class constructor takes at least these arguments. Some Field classes take additional, field-specific arguments, but the following should always be accepted:

rule

The arguments rule is the rule of selector which maybe a xpath expression or a css select expression or a regex expression.

XPath Selector

The rule argument is xpath expression.

from toapi import XPath

field = XPath('//a[@class="user"]/text()')

Signature: XPath(rule)

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Css Selector

The rule argument is css select expression.

from toapi import Css

field = Css('a.user', attr='href')

Signature: Css(rule, attr=None)

• attr Css select expression can't determine which part ot parse. We need the attr argument for that.

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Regex Selector

The rule argument regex expression.

from toapi import Regex

field = Regex('\d{18}')

Signature: Regex(rule)

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