Python 多文件内容

Question

我正在处理包含几行数字序列的文件。我想乘以该字符串的某些部分。我该怎么做呢？当我只执行 'num[10:](which is for ex 2)*4' (如下所示)时，它会打印我 '2' 四次，我想打印 8。

import os
from datetime import date

with open('C:\\Users\\X\\Desktop\\python\\Y\\Z.txt') as file:
    numbers = file.readlines()


def last_number():
    for num in numbers:
        last = num[10:]
        x = last*4
        print(x)
last_number()    

Answer 1

读取文件时，您以字符串格式读取它。为了对内容进行数学运算，您必须将其转换为 int 或 float。

具体来说，如果您知道代码中数字的确切位置，您应该尝试此操作，请注意我还发送了数字作为函数的参数:

import os
from datetime import date

with open('C:\\Users\\X\\Desktop\\python\\Y\\Z.txt') as file:
    numbers = file.readlines()


def last_number(numbers):
    # numbers = [int(num) for num in numbers]
    # prev line will create a list of numbers in integer form for you
    for num in numbers:
        last = int(num[10:])
        x = last*4
        print(x)
last_number()