请帮写一个文件分割的代码，要求文件大小不一样

[feiyuncxd]

现在有一个xxx.bin文件，大小为7221字节，我想根据我指定文件名和字节数，将它分割成若干个小文件。

也就是根据一个列表来对xxx.bin文件的数据从头至尾依次根据指定的字节数分割，列表格式如下（前面为分割后文件名，后面的数值为这个文件的字节数大小）
aa1.bin 230
aa2.bin 5900
bb1.bin 128
cc.bin 963

[rrrr336]

不知是不是你要的。 参考。

files = [('aa1.bin', 230), ('aa2.bin', 5900), ('bb1.bin', 128), ('cc.bin', 936)]
with open('xxx.bin') as binfile:
    contents = binfile.read()
file_bytes = sum([file[1] for file in files])
assert (file_bytes <= len(contents))

start = 0
for afile in files:
    end = start + afile[1]
    content = contents[start:end]
    start = end
    with open(afile[0], 'w') as newfile:
        newfile.write(content)

[chuifengde]

import os

l = {'aa1.bin': 6, 'aa2.bin': 20, 'bb1.bin': 29, 'cc.bin': -1}
s = 0
size = os.path.getsize('xxx.bin')
with open(path+'\xxx.bin', 'rb') as f1:
    for i, j in l.items():
        s += j
        if j == -1:
            j = size - s
        with open(path+'\\'+ i, 'wb') as f2:
            f2.write(f1.read(j))

[feiyuncxd]

引用 4 楼 chuifengde 的回复:

发个txt的格式图看看

[feiyuncxd]

引用 1 楼 rrrr336 的回复:

不知是不是你要的。 参考。

files = [('aa1.bin', 230), ('aa2.bin', 5900), ('bb1.bin', 128), ('cc.bin', 936)]
with open('xxx.bin') as binfile:
    contents = binfile.read()
file_bytes = sum([file[1] for file in files])
assert (file_bytes <= len(contents))

start = 0
for afile in files:
    end = start + afile[1]
    content = contents[start:end]
    start = end
    with open(afile[0], 'w') as newfile:
        newfile.write(content)

引用 2 楼 chuifengde 的回复:

import os

l = {'aa1.bin': 6, 'aa2.bin': 20, 'bb1.bin': 29, 'cc.bin': -1}
s = 0
size = os.path.getsize('xxx.bin')
with open(path+'\xxx.bin', 'rb') as f1:
    for i, j in l.items():
        s += j
        if j == -1:
            j = size - s
        with open(path+'\\'+ i, 'wb') as f2:
            f2.write(f1.read(j))

那个列表格式，能否从一个txt文件里读取呢？txt的内容就是列表那个格式，【文件名+字节数】，这个方法虽然可行，但如果要分割成几百个文件，直接写在代码files =后面就太长了

[chuifengde]

发个txt的格式图看看

[chuifengde]

import os

with open(path + 'list.txt') as f:
    con = f.read().split("\n")

    s = 0
    size = os.path.getsize(path + 'xxx.bin')
    with open(path + 'xxx.bin', 'rb') as f1:
        for cc in con:
            i, j = cc.split(' ')
            j = int(j)
            s += j
            if j == -1:
                j = size - s
            with open(path + i, 'wb') as f2:
                f2.write(f1.read(j))

最后一行最好是将字节数定为-1，这样不至于丢失字节