Why does my GeneralizedTime pyasn1 implementation report 'SyntaxError: invalid syntax'?

Here is my asn1 grammar representation:

MiepPullWtdr ::= [0] SEQUENCE
{
    timeStamp                   [8]   GeneralizedTime
}

I need help in implementing the same using pyasn1.

Here is my code snippet:

from pyasn1.type import univ, namedtype, tag, char, namedval, useful

class MiepPullWtdr(univ.Sequence):
    componentType = namedtype.NamedTypes(namedtype.NamedType('timeStamp', useful.GeneralizedTime().subtype(implicitTag=tag.Tag(tag.tagClassContext, tag.tagFormatSimple, 8)))

)

miepPullWtdr = MiepPullWtdr()
miepPullWtdr.setComponentByName('timeStamp', '201103081200Z')
print(miepPullWtdr.prettyPrint())

I also tried:

componentType  = namedtype.NamedTypes(namedtype.NamedType('timeStamp',useful.GeneralizedTime().tagSet(tag.Tag(tag.tagClassContext, tag.tagFormatSimple, 8)))

Both doesn't work and gives a weird error regrading Syntax error:

miepPullWtdr = MiepPullWtdr()
           ^
SyntaxError: invalid syntax

I have checked the commas and brackets. All seem to be correct.

This is your code except for the dangling parenthesis of the componentType fixed. Works for me:

from pyasn1.type import univ, namedtype, tag, namedval, useful

class MiepPullWtdr(univ.Sequence):
    componentType = namedtype.NamedTypes(
        namedtype.NamedType('timeStamp', useful.GeneralizedTime().subtype(implicitTag=tag.Tag(tag.tagClassContext, tag.tagFormatSimple, 8)))
    )

miepPullWtdr = MiepPullWtdr()
miepPullWtdr.setComponentByName('timeStamp', '201103081200Z')

print(miepPullWtdr.prettyPrint())