# How can i get chemical element list?

## Question:

I’d like to share something with a chemical formula. For example

C14H19NO, C10H12O2, C15H26O

to

{"C14","H19","N","O","C10","H12","O2","C15","H26","O"} like this

``````num=["1","2","3","4","5","6","7","8","9","0"]

text=input("C9H8Cl3")
lis=list(text)

for i in range(len(text)):
if lis[i] in num: lis[i]=int(lis[i])

lis2=lis[:]

k=1
for i in range(len(text)-1):
if type(lis[i])==int and type(lis[i+1])==str:
lis2.insert(i+k, "|")
k+=1

for i in range(len(lis2)):
if type(lis2[i])==int: lis2[i]=str(lis2[i])

result=""
for  i in range(len(lis2)):
result+=lis2[i]

print(result)
``````
``````I tried this, but only one can be converted at a time, and neither is converted.

I want another code.. help me
``````

Generally, we can use `re.findall` here:

``````import re

inp = ["C14H19NO", "C10H12O2", "C15H26O"]
for f in inp:
atoms = re.findall(r'[A-Z][a-z]?[0-9]*', f)
print(atoms)
``````

This prints:

``````['C14', 'H19', 'N', 'O']
['C10', 'H12', 'O2']
['C15', 'H26', 'O']
``````
Categories: questions Tags:
Answers are sorted by their score. The answer accepted by the question owner as the best is marked with
at the top-right corner.