newtest.py

def readwechatid(filepath):
    lines = []
    with open(filepath, 'r', encoding='utf-8') as file_to_read:
        while True:
            line = file_to_read.readline()
            if not line:
                break
            line = line.strip('\n')
            lines.append(line)
    return lines

file_path = 'originid.txt'


def phonenumberchange():
    newline = readwechatid(file_path)
    # int_str = [int(x) for x in newline]
    print(newline)
    workdone = []
    count = 1
    try:
        for i in newline:

            l = list(i)
            if l[-4] == '8':
                l[-4] = '9'
            elif l[-4] == '7':
                l[-4] = '8'
            elif l[-4] == '6':
                l[-4] = '7'
            elif l[-4] == '5':
                l[-4] = '6'
            elif l[-4] == '4':
                l[-4] = '5'
            elif l[-4] == '3':
                l[-4] = '4'
            elif l[-4] == '2':
                l[-4] = '3'
            elif l[-4] == '1':
                l[-4] = '2'
            elif l[-4] == '0':
                l[-4] = '1'
            elif l[-4] == '9':
                l[-4] = '8'
            i = ''.join(l)
            workdone.append(i)
            count += 1
    except IndexError:
        print(f'{count} is wrong!')
    finally:
        print(workdone)
        with open('newid.txt', 'w', encoding='utf-8') as file:
            for i in workdone:
                file.write(i + '\n')

li = [1,2,3,1,5]
li.pop()
print(li)