CODEWITHSUNDEEP
regexpython-3.xdatetime
T.BJ
T.BJ

Reputation: 99

Python regex within an F string?

Currently I have the following:

for child in root:
    if child.attrib['startDateTime'] == fr'2019-11-10T{test_time}:\d{{2}}':
        print('Found')

Which isn't working. The goal here is to match the datetime string with my own string where test_time is formatted as 'HH:MM', and the seconds digits can be anything from 00 - 60.

Is this the correct approach for a problem like this? Or am I better off converting to datetime objects?

Upvotes: 1

Views: 7565

Answers (2)

wjandrea
wjandrea

Reputation: 33107

It's not the f-string that's the problem. The r prefix on a string doesn't mean "regex", it means "raw" - i.e. backslashes are taken literally. For regex, use the re module. Here's an example using Pattern.match:

import re

regex = fr'2019-11-10T{test_time}:\d{{2}}'
pattern = re.compile(regex)
for child in root:
    if pattern.match(child.attrib['startDateTime']):
        print('Found')

Upvotes: 5

Barmar
Barmar

Reputation: 781771

You can put a regexp in an f-string, but you need to use the re module to match with it, not ==.

if re.match(fr'2019-11-10T{test_time}:\d{{2}}', child.attrib['startDateTime']):
    print('Found')

Upvotes: 2

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