Python 如何将两个文件中的列相加和相乘？

我有两个输入文件（

input1.txt

和

input2.txt

）。我会将第一个输入文件（

input1.txt

）的第一列乘以第二个输入文件（

input2.txt

）的第三列，将两个输入文件的第二列相加，并将结果写入输出文件

我尝试了下面的代码，但它给出了错误。如何修复我的代码

错误：

#!/usr/bin/env python3

with open('output.txt', mode='w') as f:
    with open("1.txt") as f1:
        data1 = f1.readlines()
        for line1 in data1:
            lines1 = line1.strip('')
            with open("2.txt") as f2:
                data2 = f2.readlines()
                for line2 in data2:
                    lines2 = line2.strip('')
                    f.write ("%.3f %.3f\n" % (float(lines1[0]*float(lines2[2]),
                                              float(lines1[1]+float(line1[1])))

SyntaxError:解析时出现意外的EOF

input1.txt:

#!/usr/bin/env python3

with open('output.txt', mode='w') as f:
    with open("1.txt") as f1:
        data1 = f1.readlines()
        for line1 in data1:
            lines1 = line1.strip('')
            with open("2.txt") as f2:
                data2 = f2.readlines()
                for line2 in data2:
                    lines2 = line2.strip('')
                    f.write ("%.3f %.3f\n" % (float(lines1[0]*float(lines2[2]),
                                              float(lines1[1]+float(line1[1])))

2.51.2
5.5 6.5
3.2 6.3

input2.txt:

#!/usr/bin/env python3

with open('output.txt', mode='w') as f:
    with open("1.txt") as f1:
        data1 = f1.readlines()
        for line1 in data1:
            lines1 = line1.strip('')
            with open("2.txt") as f2:
                data2 = f2.readlines()
                for line2 in data2:
                    lines2 = line2.strip('')
                    f.write ("%.3f %.3f\n" % (float(lines1[0]*float(lines2[2]),
                                              float(lines1[1]+float(line1[1])))

10.512.520.2
13.1 14.5 30.1
15.9 16.7 40.2

所需输出.txt:

#!/usr/bin/env python3

with open('output.txt', mode='w') as f:
    with open("1.txt") as f1:
        data1 = f1.readlines()
        for line1 in data1:
            lines1 = line1.strip('')
            with open("2.txt") as f2:
                data2 = f2.readlines()
                for line2 in data2:
                    lines2 = line2.strip('')
                    f.write ("%.3f %.3f\n" % (float(lines1[0]*float(lines2[2]),
                                              float(lines1[1]+float(line1[1])))

#第一个数据第二个数据
50.20   13.7
165.55  21.0
128.64  23.0

代码：

#!/usr/bin/env python3

with open('output.txt', mode='w') as f:
    with open("1.txt") as f1:
        data1 = f1.readlines()
        for line1 in data1:
            lines1 = line1.strip('')
            with open("2.txt") as f2:
                data2 = f2.readlines()
                for line2 in data2:
                    lines2 = line2.strip('')
                    f.write ("%.3f %.3f\n" % (float(lines1[0]*float(lines2[2]),
                                              float(lines1[1]+float(line1[1])))

---

将代码粘贴到编辑器中后，我可以看到在

f.write（）

调用的末尾缺少一些右括号，这导致了

SyntaxError:expected EOF解析时出现
错误。添加那些缺少的
）
，错误就会消失。您还忘记了将线拆分为单独的元素。在执行
float
转换时，这将导致
ValueError

您的代码没有错误：

with open('output.txt', mode='w') as f:
    with open("1.txt") as f1:
        data1 = f1.readlines()
        for line1 in data1:
            lines1 = line1.strip('').split()
            with open("2.txt") as f2:
                data2 = f2.readlines()
                for line2 in data2:
                    lines2 = line2.strip('').split()
                    f.write ("%.3f %.3f\n" % (float(lines1[0])*float(lines2[2]),
                                              float(lines1[1])+float(lines1[1])))

然而，逻辑需要调整。上面的代码迭代第一个输入文件中的每一行，然后在其中迭代第二个文件中的每一行。这将给你一个笛卡尔线积，我不相信这是你想要的

我们可以从它创建的不正确输出中看出这一点：

50.500 2.400
75.250 2.400
100.500 2.400
111.100 13.000
165.550 13.000
221.100 13.000
64.640 12.600
96.320 12.600
128.640 12.600

相反，您可以并行迭代这两个文件。您可以使用将两个输入文件聚合在一起，以在各自的列之间进行计算：

# Open both input files and output file
with open("input1.txt") as input1, open("input2.txt") as input2, open("output.txt", mode="w") as out:

    # Zip both inputs so we can do column matching
    for line1, line2 in zip(input1, input2):

        # Split lines into lists representing columns
        col1, col2 = line1.split(), line2.split()

        # Do both calculations
        # Round the first one to 2 decimal places and second one to 1 decimal place
        first_calc = round(float(col1[0]) * float(col2[2]), 2)
        second_calc = round(float(col1[1]) + float(col2[1]), 1)

        # Write to file
        out.write(f"{first_calc} {second_calc}\n")

这将提供以下output.txt：

我将保留最终格式供您执行：-）
请提供完整的错误消息。你做过调试和研究吗？这能回答你的问题吗？是的，最后一笔没有足够的结束括号。