Подсчёт суммы чисел в файле

def main(filename):
    total = []
    with open(filename, "r") as file:
        temp = file.readlines()
        for item in temp:
            total.append(int(item))
    return sum(total)
 
 
if __name__ == '__main__':
    print (main("input.txt"))

>>> import re
>>> sum(map(lambda x: int(x), re.findall(r'\d+', 'abc12e34fg56h')))
102

import re
print(sum(map(lambda x: int(x), re.findall(r'\d+', 'abc12e34fg56h 1 2 3'))))

sum(map(int, re.findall(r'\d+', 'abc12e34fg56h')))

>>> sum(map(lambda x: int(x.replace(' ', '')), re.findall(r'[0-9 ]+', 'abc12e34fg5 6h 1 2 3')))
225

def sum_ints_in_file(file_name):
    with open(file_name, 'r') as fp:
        return sum(map(int, fp.read().split()))
 
 
print(sum_ints_in_file('file.txt'))
if __name__ == '__main__':
    filename = input()
    sum_ints_in_file(file_name=)

import re
 
text = open('input.txt').read()
# text = text.replace(' ', '')
total = sum(map(int, re.findall(r'\d+', text)))
print(total)

map(int, …)

def sum_in_str(stri):
    sum=0
    acc=0
    for a in stri:
        if not a in "0123456789":
            sum+=acc
            acc=0
        else:
            acc=acc*10+int(a)
    sum+=acc
    return sum

>>> re.sub(r'[a-zA-Z]', '', 'wdfh5 6wejfh').split()
['5', '6']

>>> re.sub(r'[a-zA-Z]', '', '1x2y3 4 5 6').split()
['123', '4', '5', '6']