how to convert pandas dataframe to hosseinmoein dataframe.

[xkungfu]

I have worked out this , but don't know if it is good way. If it is useful, hope it help someone.

the codes:

python side:

temp_str = all_df.to_csv(); then store the temp_str to a file or to redis.

c++ side:

inline std::string ReplaceAll(std::string str, const std::string& from, const std::string& to)
{
    size_t start_pos = 0;
    while ((start_pos = str.find(from, start_pos)) != std::string::npos) {
        str.replace(start_pos, from.length(), to);
        start_pos += to.length(); // Handles case where 'to' is a substring of 'from'
    }
    return str;
}

std::string str_from_python = A STRING FROM PYTHON SIDE, FROM A FILE OR FROM REDIS ETC.;

//prepare to replace the first line of the python side string:
std::string first_line_base = "INDEX:14:<ulong>,id:14:<double>,name:14:<string>";

//count the lines of the string：
int count = 0;
std::string b = "\n";
std::string::size_type i = str_from_python.find(b);
while (i != std::string::npos)
{
    ++count;
    i = str_from_python.find(b, i+b.length());
}

std::string first_line_new = ReplaceAll(first_line_base, "14", std::to_string(count));

//remove the first line of the string
str_from_python.erase(0, str_from_python.find("\n") + 1);

//add new line to the string：
std::string str_from_python_new = first_line_new + "\n" + str_from_python;

MYDataFrame df = from_string(str_from_python_new)

[hosseinmoein]

Yes, as you figured out the only problem is that the header of DataFrame in csv2 format is different than Pandas header.

DataFrame in its header has two more items; the type of the column and number of rows in the column. For number of rows, you don't have to be accurate. It is an estimate. You can even put 0 and it would work. Of course to be most efficient in space allocation and speed you must be accurate.

[xkungfu]

thanks for explanation! that is very good!