[Python] Repeat the characters based on the preceding number in a string

I am a beginner in python and this is how I approached to the solution: I have divided the string into two lists- number list and character list. And then I multiplied them. Is there any other better solution than this?

def split_string(input_str):
num_list =[]
char_list =[]
current_char =''
result=''
for i in range(len(input_str)):
if input_str.isdigit():
num_list .append(input_str)
if current_char :
char_list.append(current_char)
current_char =''
else:
current_char+=input_str
if current_char :
char_list.append(current_char)
for i in range(len(char_list)):
result+= int(num_list)*char_list
return result

input_str = "1a2bc3efg"

print(split_string(input_str))


Example1:

Input: 1a2bc3efg

Output: abcbcefgefgefg

Example2:

Input: 3a4e

Output: aaaeeee

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