py-atomic-weights: Python Module for Standard atomic weights of the elements
Features
- IUPAC Atomic Weights in
floatanddecimal.Decimalformats
Usage
pip install atomic-weights
>>> import atomic_weights as atw
>>> print(atw.Fe)
55.845
>>> print(atw.decimal.Fe)
55.845
>>> type(atw.Fe)
<class 'float'>
>>> type(atw.decimal.Fe)
<class 'decimal.Decimal'>
import re
import unicodedata
import atomic_weights as atw
def molecular_mass(x: str) -> float:
"""formula -> g/mol"""
x = unicodedata.normalize("NFKC", x)
y = 0
for elem, num in re.findall(r"(?:([A-Z][a-z]*)(\d+)?)", x):
num = int(num) if num else 1
y += num * getattr(atw, elem)
return y
molecular_mass("Al2O3")
# 101.9600768
molecular_mass("Al₂O₃")
# 101.9600768
1 maintainer
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