fixforvinh.py

# Way 1 
a = "12354+656565865"
num1 = ""
num2 = ""
index = 1

for i in range(len(a)):
    if str.isdigit(a[i]):
        num1 += a[i]
        index += 1
    else:
        for i in range(index,len(a)):
            num2 += a[i]
        break
print(num1,num2)

# Way 2 
a = "12354+656565865"
num1 = ""
num2 = ""
index = 1

for i in range(len(a)):
    if str.isdigit(a[i]):
        num1 += a[i]
        index += 1
    else:
        print(index)
        num2 = a[index:len(a)]
        break
print(num1,num2)

# way 3
a = "12354+65656-5865"
num1 = ""
num2 = ""
index = 1

#regex match number
import re
print(re.findall(r'\d+', a))

a = "235+2*5*13/20+6*2"
import re
m = re.split(r'[^\d]',a)
print(m)
n = re.split(r'\d+',a)
def mul(m):
    s = 1
    for i in m:
        s *= int(i)
    return s
def div(m):
    s = 1
    for i in m:
        s /= int(i)
    return s
def sum(m):
    s = 1
    for i in m:
        s += int(i)
    return s
def sub(m):
    s = 1
    for i in m:
        s -= int(i)
    return s
def changetonum(str):
    return int(str)
print(n)

Output :
m = ['235', '2', '5', '13', '20', '6', '2']
n = ['', '+', '', '', '/', '+', '*', '']