如何使用python合并两个文件

Question

我想合并两个文件。代码应将两个文件（input1.txt 和 input2.txt）的第二行相加，将求和的结果写入文件（final.txt），将 input2.txt 中以“1MOL”开头的所有行追加到final.txt，最后将 input1.txt 中的所有行（前两行除外）附加到 final.txt 中。我的代码只将“18”（两个输入文件中第二行的总和）写入 final.txt。如何修复我的代码？

input1.txt

Molecule in solvent
13
    1MET      N    1   4.761   6.470   2.128
    1MET     H1    2   4.749   6.567   2.153
    1MET     H2    3   4.833   6.430   2.184
    1MET     H3    4   4.785   6.464   2.031
    1MET     CA    5   4.636   6.399   2.152
    1MET     HA    6   4.567   6.442   2.093
    1MET     CB    7   4.651   6.250   2.113
    1MET    HB1    8   4.730   6.213   2.162
    1MET    HB2    9   4.667   6.244   2.015
    1MET     CG   10   4.530   6.163   2.147
    1MET    HG1   11   4.452   6.219   2.119
    1MET    HG2   12   4.532   6.156   2.247
    1MET     SD   13   4.524   5.998   2.070
 spc.itp

input2.txt：

Gallium Rubidium
   5
    1MOL     CL    1   2.131   2.473   6.188
    1MOL      P    2   1.714   2.422   6.273
    1MOL      O    3   1.839   2.324   6.306
    1MOL      O    4   1.783   2.542   6.188
    1MOL      O    5   1.682   2.491   6.416

我的代码：

search_string = 'MOL'
    #read the first input file
    with open("input1.txt", mode="r") as f1:
    #open a file to merge two files
        with open("final.txt", mode="a") as f: 
            #skip the first line of the input1.txt
            line=f1.readlines()
            #take the second line of input1.txt
            a=float(line[1])
            #read the second input file
            with open("input2.txt", mode="r") as f2:
                f2lines=f2.readlines()
                b=float(f2lines[1])
                result=float(a+b)
                f.write("%.f\n" % result)
                for f2lines in f2:
                if search_string in f2lines:
                    f.write(f2lines)

所需的 final.txt：

18
    1MOL     CL    1   2.131   2.473   6.188
    1MOL      P    2   1.714   2.422   6.273
    1MOL      O    3   1.839   2.324   6.306
    1MOL      O    4   1.783   2.542   6.188
    1MOL      O    5   1.682   2.491   6.416
    1MET      N    1   4.761   6.470   2.128
    1MET     H1    2   4.749   6.567   2.153
    1MET     H2    3   4.833   6.430   2.184
    1MET     H3    4   4.785   6.464   2.031
    1MET     CA    5   4.636   6.399   2.152
    1MET     HA    6   4.567   6.442   2.093
    1MET     CB    7   4.651   6.250   2.113
    1MET    HB1    8   4.730   6.213   2.162
    1MET    HB2    9   4.667   6.244   2.015
    1MET     CG   10   4.530   6.163   2.147
    1MET    HG1   11   4.452   6.219   2.119
    1MET    HG2   12   4.532   6.156   2.247
    1MET     SD   13   4.524   5.998   2.070
 spc.itp

Answer 1

f2lines=f2.readlines() 读取来自f2 的所有行。然后for f2lines in f2: 将一无所获。将for f2lines in f2:循环更改为

for f2line in f2lines:
    if search_string in f2line:
        f.write(f2line)

您忘记将line 中的行附加到最终文件中。您需要另一个 for 循环来执行此操作：

for i in xrange(2, len(line)):
    f.write(line[i])

代码是：

search_string = 'MOL'
#read the first input file    
with open("input1.txt", mode="r") as f1:
    #open a file to merge two files
    with open("final.txt", mode="w") as f: 
        #skip the first line of the input1.txt
        line=f1.readlines()
        #take the second line of input1.txt
        a=float(line[1])
        #read the second input file
        with open("input2.txt", mode="r") as f2:
            f2lines=f2.readlines()
            b=float(f2lines[1])
            result=float(a+b)
            f.write("%.f\n" % result)
            for f2line in f2lines:
                if search_string in f2line:
                    f.write(f2line)
            for i in xrange(2,len(line)):
                f.write(line[i])