Please consider the following shell session. It seems as soon as I redirect the virtualenv python's output to a file, the encoding becomes "ascii" and hence unicode characters cannot be written. This ...

Writes ascii hex strings to a file directly as in binary hex format. The string can be multi-line or single-line and 0x-prefixed or not. Excess whitespace in the input is ignored. Get the module via ...

The problem I've noticed is that if I append the file with each of the 100k runs (one at a time), it can happen that two threads try to save to the file at the same time and some row (s) end up empty.