How to generate properties of instances of classes in batches?

Question

I have a class named MyClass. I want to generate the attributes k_10sec to k_1d of the instance in batches when generating instances of the class.

How do I modify the code?

bars = ['10sec', '1min', '5min', '30min', '1d'] class MyClass: def __init__(self): for bar in bars: if bar.endswith('sec'): duration_seconds = int(bar[:-3]) elif bar.endswith('min'): duration_seconds = int(bar[:-3] * 60) elif bar.endswith('d'): duration_seconds = int(bar[:-1] * 60 * 60 * 24) self.globals()[f'k_{bar}'] = duration_seconds s1 = MyClass() for bar in bars: print(s1.[f'k_{bar}'])

My expected result:

10 60 300 1800 86400

Finally, I combined the two methods and used them together.

import re def parse_time(bar='', secs=0): if bar != '': bar = re.split('(\d+)', bar) if bar[2] in ('sec', 's'): secs = int(bar[1]) elif bar[2] == 'min': secs = int(bar[1]) * 60 elif bar[2] in ('hour', 'h'): secs = int(bar[1]) * 60 * 60 elif bar[2] in ('d', 'day', 'D'): secs = int(bar[1]) * 60 * 60 * 24 else: pass return secs elif secs != 0: if secs % (60 * 60 * 24) == 0: bar = str(secs // (60 * 60 * 24)) + 'day' elif secs % (60 * 60) == 0: bar = str(secs // (60 * 60)) + 'hour' elif secs % 60 == 0: bar = str(secs // 60) + 'min' else: bar = str(secs) + 'sec' return bar else: pass class MyClass: def __init__(self, bars): self.d = {f'k_{bar}': parse_time(bar=bar) for bar in bars} if __name__ == '__main__': bars = ['10sec', '1min', '5min', '30min', '1d'] s1 = MyClass(bars) pass

self.a = list(range(100)). Why do you need 100 separate attributes? — chepner
– chepner, Commented Jun 22, 2021 at 13:35
Does this answer your question? How do I create variable variables? — quamrana
– quamrana, Commented Jun 22, 2021 at 13:38
Use a dictionary to store the values using the "variable name" as the key. — Eric McLachlan
– Eric McLachlan, Commented Jun 22, 2021 at 13:40
@quamrana I have implemented the use of variable variables, but I have not found a way to use variable variables in the class. — jaried
– jaried, Commented Jun 22, 2021 at 14:10

chepner · Accepted Answer · 2021-06-22 14:15:09Z

You don't need globals; that's a function in the built-in scope for providing a dict interface to the global variables. Just use a regular dict

class MyClass: def __init__(self, bars): self.d = {} for bar in bars: if bar.endswith('sec'): duration_seconds = int(bar[:-3]) elif bar.endswith('min'): duration_seconds = int(bar[:-3]) * 60 elif bar.endswith('d'): duration_seconds = int(bar[:-1]) * 60 * 60 * 24 self.d[f'k_{bar}'] = duration_seconds s1 = MyClass(['10sec', '1min', '5min', '30min', '1d']) for bar in s1.d: print(s1.d[bar])

I would move the logic of converting a time string to a number of seconds to a separate function, though:

def parse_time(s): if s.endswith('sec'): return int(s[:-3]) elif s.endswith('min'): return int(s[:-3]) * 60 elif s.endswith('d'): return int(s[:-1]) * 60 * 60 * 24 class MyClass: def __init__(self, bars): self.d = {f'k_{bar}': parse_time(bar) for bar in bars}

ShiraStar · Accepted Answer · 2021-06-22 14:27:07Z

I wrote a very simple solution, hope that was you intention

import re bars = ['10sec', '1min', '5min', '30min', '1d'] class MyClass: def duration_seconds(self, bar): bar = re.split('(\d+)', bar) if bar[2] == 'sec': secs = int(bar[1]) elif bar[2] == 'min': secs = int(bar[1]) * 60 elif bar[2] == 'd': secs = int(bar[1]) * 60 * 60 * 24 return secs s1 = MyClass() for bar in bars: print(s1.duration_seconds('k_{0}'.format(bar)))

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