angle-parser
A simple Python module for parsing angle strings.
Installation
pip install angle-parser
Usage
from angle_parser import parse_angle
# Whitespace between value and suffix is optional
parse_angle("90 deg") # 1.5707963267948966 (π/2 radians)
parse_angle("90deg") # 1.5707963267948966 (same, no space)
parse_angle("1 arcmin") # 0.000290888... (1/60 degree in radians)
parse_angle("1'") # 0.000290888... (synonym for arcmin)
parse_angle("1 arcsec") # 4.8481368...e-06 (1/3600 degree in radians)
parse_angle('1"') # 4.8481368...e-06 (synonym for arcsec)
parse_angle("1000 mas") # 4.8481368...e-06 (milli-arcsec)
parse_angle("1e6 uas") # 4.8481368...e-06 (micro-arcsec)
parse_angle("1 rad") # 1.0
parse_angle("-45 deg") # -0.785398... (negative angles)
parse_angle("1.5e2 deg") # 2.617993... (scientific notation)
Supported Suffixes
| Suffix | Description | Radians multiplier |
|---|---|---|
deg |
Degrees | π/180 |
arcmin |
Arcminutes (1/60 degree) | π/10800 |
' |
Arcminutes (synonym) | π/10800 |
arcsec |
Arcseconds (1/3600 deg) | π/648000 |
" |
Arcseconds (synonym) | π/648000 |
mas |
Milli-arcseconds | π/648000000 |
uas |
Micro-arcseconds | π/648000000000 |
rad |
Radians | 1.0 |
API
parse_angle(string)
Parse an angle string and return the value in radians.
- Parameters:
string— A string containing a numeric value followed by a valid suffix (deg,arcmin/',arcsec/",mas,uas,rad). Whitespace between the value and suffix is optional. - Returns:
float— The angle in radians. - Raises:
ValueError— if the string does not match the expected format.
License
Copyright (c) Tim Molteno 2026 (tim@elec.ac.nz)
MIT License
1 maintainer
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