How to convert a string that includes decimal point to a list in python

Question

The input string is like this

a=(2.5+6/3.7*2.09)

It needs to be converted to a list to be used as a calculator

b=['2.5','+','6','/','3.7','*','2.09']

How to convert the string a to a list like b, such that the decimal point numbers are considered as a single number not like ['2','.','0','9']

Answer 1

You can use split a string by Multiple Delimiters :

import re
a="2.5+6/3.7*2.09"
print(re.split('\+|\*|/',a))

output:

['2.5', '6', '3.7', '2.09']

Full solution:

import re
a="2.5+6/3.7*2.09"
pattern='\+|\/+|\*'
strings=re.split('\+|\*|/',a)
sym=re.findall(pattern,a)
new=[]
for i in range(len(strings)):
    new.append(strings[i])
    try:
        new.append(sym[i])
    except IndexError:
        pass
print(new)

output:

['2.5', '+', '6', '/', '3.7', '*', '2.09']