Python 在两个文件之间每隔一行分割一行

我目前正在尝试自动化一个过程，如果我们看到每月运行的虚拟机数量发生突然变化，它会提醒我。下面是数据的样子

January.txt               February.txt

Web Fleet                 Web Fleet
100                       112
Proxy Fleet               Proxy Fleet
25                        22
Beta Fleet                Beta Fleet
12                        10

我基本上想打开两个不同的文件，让python在两个文件之间用数字分隔每一行。从那里，我可以说“如果代码-

输出-

0.8928571428571429
1.1363636363636365
1.2

---

可能更简单的方法是先读取两个文件的内容，

zip

将它们放在一起，然后一次迭代移动两行：

with open("jan.txt") as file1:
    with open("feb.txt") as file2:
        lines = zip(file1.readlines(), file2.readlines())
        for line1, line2 in lines[1::2]:
            val1 = float(line1.strip())
            val2 = float(line2.strip())
            print val1/val2

[1:：2]

位表示从索引1开始，一次移动2个项目

不预先读取文件内容的替代实现：

with open("jan.txt") as file1:
    with open("feb.txt") as file2:
        while True:
            file1.readline()
            file2.readline()
            line1 = file1.readline()
            line2 = file2.readline()
            if line1 == "" or line2 == "":
                break

            val1 = float(line1.strip())
            val2 = float(line2.strip())
            print val1/val2

---

您的文件行是否总是匹配，或者您是否必须让您的代码使其匹配？如果它们已经匹配，我怀疑

zip

将在开箱即用的情况下完成您最想做的事情。它们总是匹配。Python脚本按设置的顺序一次执行一个查询，以确保。仅供参考，您的示例代码可以写成：

>粘贴一月.txt二月.txt | awk'NR%2==0{print$1/$2}'

或

awk'NR==FNR{a[NR]=$0；next}FNR%2==0{print a[FNR]/$1}'jan.txt二月.txt

如果他在使用python 2.7，他需要一个浮点除法，否则他会得到一个整数答案…@pekapa编辑它。现在它可以同时使用python 2和python 3。

with open("jan.txt") as file1:
    with open("feb.txt") as file2:
        lines = zip(file1.readlines(), file2.readlines())
        for line1, line2 in lines[1::2]:
            val1 = float(line1.strip())
            val2 = float(line2.strip())
            print val1/val2

with open("jan.txt") as file1:
    with open("feb.txt") as file2:
        while True:
            file1.readline()
            file2.readline()
            line1 = file1.readline()
            line2 = file2.readline()
            if line1 == "" or line2 == "":
                break

            val1 = float(line1.strip())
            val2 = float(line2.strip())
            print val1/val2