Hi Everyone,
I really like how go parses durations:
```
hours, _ := time.ParseDuration("10h")
complex, _ := time.ParseDuration("1h10m10s")
micro, _ := time.ParseDuration("1µs")
// The package also accepts the incorrect but common prefix u for micro.
micro2, _ := time.ParseDuration("1us")
```
Consider the example in
https://docs.python.org/3/library/datetime.html#timedelta-objects:
```
>>> from datetime import timedelta
>>> delta = timedelta(
... days=50,
... seconds=27,
... microseconds=10,
... milliseconds=29000,
... minutes=5,
... hours=8,
... weeks=2
... )
```
With a go like parsing it would be:
```
>>> datetime.parse_duration("2w50d8h5m27s10ms2000us")
```
Go lang's implementation only supports "ns", "us" (or "µs"), "ms", "s", "m",
"h", but that does not mean Python has to restirct itself to these units.
There a few similar pypi packages and SO answers with similar implementations,
so there a basis to start from:
https://github.com/wroberts/pytimeparse
https://github.com/oleiade/durations
But the code can be as simple as this:
from datetime import timedelta
import re
```
regex = re.compile(
r'((?P<weeks>[\.\d]+?)w)?'
r'((?P<days>[\.\d]+?)d)?'
r'((?P<hours>[\.\d]+?)h)?'
r'((?P<minutes>[\.\d]+?)m)?'
r'((?P<seconds>[\.\d]+?)s)?'
r'((?P<microseconds>[\.\d]+?)ms)?'
r'((?P<milliseconds>[\.\d]+?)us)?$'
)
def parse_time(time_str):
"""
Parse a time string e.g. (2h13m) into a timedelta object.
Modified from virhilo's answer at https://stackoverflow.com/a/4628148/851699
:param time_str: A string identifying a duration. (eg. 2h13m)
:return datetime.timedelta: A datetime.timedelta object
"""
parts = regex.match(time_str)
assert parts is not None, "Could not parse any time information from '{}'.
Examples of valid strings: '8h', '2d8h5m20s', '2m4s'".format(time_str)
time_params = {name: float(param) for name, param in
parts.groupdict().items() if param}
return timedelta(**time_params)
print(repr(parse_time("2w50d8h5m27s10ms2000us")))
```
This is an extended version of: https://stackoverflow.com/a/51916936/492620\
Is there someone willing to sponsor a PR for adding this to the STL?
I'm willing to work on the code as well as the tests and documentation (I
contributed small changes to docs.python.org and the `calendar` module in the
past).
Best regards,
Oz
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