Python f-string parsing NoneType from dictionary

Question

d = {'surname':"Doe",'name':"Jane",'prefix':"Dr."}
f"""{d['prefix'] or ''} {d['name'][0]+'. ' or ''}{d['surname']}"""

works, however

d = {'surname':"Doe",'name':None,'prefix':"Dr."}
f"""{d['prefix'] or ''} {d['name'][0]+'. ' or ''}{d['surname']}"""

does not of course. How can I parse values from a dictionary conditionally? Or are there other work-arounds? I am iterating through a list of dictionaries with a lot of entries each so editing the data beforehand is not really an option here.

I would prefer `d.get('prefix', '')`, as `d['prefix']` will not simply produce a false value if `prefix` isn't a key. — chepner, Aug 05 '22 at 16:05

score 1 · Accepted Answer · edited Aug 05 '22 at 16:04

1

Simply add a condition inside f string

f"""{d['prefix'] or ''} {d['surname'][0]+'. ' if d['surname'] is not None else ''}{d['name']}"""

edited Aug 05 '22 at 16:04

chepner

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answered Aug 05 '22 at 16:02

Nuri Taş

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score 0 · Answer 2 · answered Aug 05 '22 at 16:22

0

Use condition to check if name has value.

f"""{d['name'][0] if d.get('name') else None}"""

answered Aug 05 '22 at 16:22

Paul

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score 0 · Answer 3 · answered Aug 05 '22 at 16:24

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use if in f-string

f"{d['prefix'] or ''} {d['name'] if d['name'] != None else ''}. {d['surname']}"

answered Aug 05 '22 at 16:24

Sk4rt

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Python f-string parsing NoneType from dictionary

3 Answers3