pg. 296 : code doesn't result in what's in book

[dougler]

(jb
.filter(like=r'job.role.*t')
.where(jb.isna(), 1)
)
results in a single col with the indexes 1...54461

(jb
.filter(like=r'job.role.*t')
.where(jb.isna(), 1)
.fillna(0)
)
ditto

Thereafter seems to be ok