Repeating fields format in Python-CodePudding

I'm converting a custom instrument binary data into a CSV file. There're 100 fields with float, int and texts. I'm using bitstruct for it.

    with open('instrument.dat','rb') as f:
        with open('instrument.csv','w') as w:
           header_format = 'u32u8u32t8192'
           header_size = calcsize_in_bytes(header_format)
           body_format = 'u4u4u1u1u1u1u4u16t96f32f32f32f32f32f32f32f32f32f32f32f32f32f32f32f32f32f32f32f32f32f32f32f32f32f32f32f32f32f32f32f32f32f32f32f32f32f32f32f32f32f32f32f32f32f32f32f32s16s16f32f32u16u16f32f32f32f32f32f32f32f32f32f32f32f32f32f32f32f32f32f3232f32f32f32f32f32f32f32f32f32f32f32f32s16s16f32f32u16u16f32f32f32f32f32f32f32f32f32f32f32f32f32f32f32f32f32f32<'
           body_size = calcsize_in_bytes(body_format)

           ver,instrument,date,comment = unpack(header_format, f.read(header_size))
           w.write('{},{},{},{}\n'.format(ver,instrument,date,comment))
           while True:
               field1,...,fieldn = unpack(body_format,f.read(body_size))

My question is how to write body part in CSV? I wouldn't wanna write something cumbersome like:

w.write("{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{},{}...{}\n".format(field1, field2,field3,field4,field5,field6,field7,fiel8,...,fieldN))

Is there any short and smart way to this?

Thanks in advance.

More details:

There are 100 fields with different values in binary. Format is like that:

u4u4u1u1u1u1u4u16t96f32f32f32f32f32f32f32f32f32f32f32f32f32f32f32f32f32f32f32f32f32f32f32f32f32f32f32f32f32f32f32f32f32f32f32f32f32f32f32f32f32f32f32f32f32f32f32f32s16s16f32f32u16u16f32f32f32f32f32f32f32f32f32f32f32f32f32f32f32f32f32f3232f32f32f32f32f32f32f32f32f32f32f32f32s16s16f32f32u16u16f32f32f32f32f32f32f32f32f32f32f32f32f32f32f32f32f32f32<

u is unsigned int, f is float, s is text are all in bits

All I want is comma-separated values so I can import them into different programs.

Header1,Header2,Header3,…,Header100
Value1,value2,value3,…,value100
...
Value1,value2,value3,...,value100

CodePudding user response：

Final solution, based on above comments.

    with open('instrument.dat','rb') as f:
        with open('instrument.csv','w') as w:
           header_format = 'u32u8u32t8192'
           header_size = calcsize_in_bytes(header_format)
           body_format = 'u4u4u1u1u1u1u4u16t96f32f32f32f32f32f32f32f32f32f32f32f32f32f32f32f32f32f32f32f32f32f32f32f32f32f32f32f32f32f32f32f32f32f32f32f32f32f32f32f32f32f32f32f32f32f32f32f32s16s16f32f32u16u16f32f32f32f32f32f32f32f32f32f32f32f32f32f32f32f32f32f3232f32f32f32f32f32f32f32f32f32f32f32f32s16s16f32f32u16u16f32f32f32f32f32f32f32f32f32f32f32f32f32f32f32f32f32f32<'
           body_size = calcsize_in_bytes(body_format)

           ver,instrument,date,comment = unpack(header_format, f.read(header_size))
           w.write('{},{},{},{}\n'.format(ver,instrument,date,comment))
           while True:
               variables = unpack(body_format,f.read(body_size))
               brackets = "{}," * len(variables)
               brackets = brackes.rstrip(',')   "\n"
               w.write(brakets.format(*variables))