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60 lines
No EOL
1.7 KiB
Markdown
60 lines
No EOL
1.7 KiB
Markdown
---
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title: Convert string to duration
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tags: python, conversion
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---
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I found myself wanting to convert a string to a duration (int), for some configuration.
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Something you can call like this:
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```python
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string_to_duration("1d", target="days")
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string_to_duration("1d", target="hours")
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string_to_duration("3m", target="hours")
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string_to_duration("3m", target="minutes")
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```
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The code :
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```python
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from typing import Literal
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def string_to_duration(value: str, target: Literal["days", "hours", "minutes"]):
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"""Convert a string to a number of hours, days or minutes"""
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num = int("".join(filter(str.isdigit, value)))
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# It's not possible to convert from a smaller unit to a greater one:
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# - hours and minutes cannot be converted to days
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# - minutes cannot be converted to hours
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if (target == "days" and ("h" in value or "m" in value.replace("mo", ""))) or (
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target == "hours" and "m" in value.replace("mo", "")
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):
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msg = (
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"Durations cannot be converted from a smaller to a greater unit. "
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f"(trying to convert '{value}' to {target})"
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)
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raise ValueError(msg, value)
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# Consider we're converting to minutes, do the eventual multiplication at the end.
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if "h" in value:
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num = num * 60
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elif "d" in value:
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num = num * 60 * 24
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elif "w" in value:
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num = num * 60 * 24 * 7
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elif "mo" in value:
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num = num * 60 * 24 * 30 # considers 30d in a month
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elif "y" in value:
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num = num * 60 * 24 * 365
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elif "m" in value:
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num = num
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else:
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raise ValueError("Invalid duration value", value)
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if target == "hours":
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num = num / 60
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elif target == "days":
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num = num / 60 / 24
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return num
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``` |