Convert string to list of mixed float, int and str knowing the format in Python [duplicate]

Question

Consider a simple string like '1.5 1e+05 test 4'. The format used in Python 2.7 to generate that string is '%f %e %s %i'. I want to retrieve a list of the form [1.5,100000,'test',4] from my input string knowing the string formatter. How can I do that (Python 2.7 or Python 3)?

Thanks a lot,

Ch.

import parse, format_string='{:1f} {:.2e} {:s} {:d}' pn=format_string.format(1.5,100000,'test',4) parsed=parse.parse(format_string, pn) Does not work — ChrisB
– ChrisB, Commented Nov 22, 2017 at 22:06
In your format string, replace {:s} with {}. For some reason this works — Jerfov2
– Jerfov2, Commented Nov 22, 2017 at 22:22

Jerfov2 · Accepted Answer · 2017-11-22 22:31:09Z

1

Use the parse module. This module can do 'reverse formatting'. Example:

from parse import parse

format_str = '{:1f} {:.2e} {} {:d}' 
data = [1.5, 100000, 'test', 4]
data_str = format_str.format(*data)
print(data_str) # Output: 1.500000 1.00e+05 test 4
parsed = parse(format_str, data_str)
print(parsed) # Output: <Result (1.5, 100000.0, 'test', 4) {}>
a, b, c, d = parsed # Whatever

answered Nov 22, 2017 at 22:31

Jerfov2

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Jerfov2 Over a year ago

@ChrisB You're welcome! If you liked the answer, accept it

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Convert string to list of mixed float, int and str knowing the format in Python [duplicate]

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